RU2398352C2 - Device for transmission/reception of radio frequency signal and method for transmission/reception of radio frequency signal - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: device for transmission/reception of RF signal is arranged with the possibility to perform function of duplex transmission/reception, using bidirectional mixer in the range of intermediate frequency (IF) or main frequency band, but not in RF range. When reception signal of RF range is passed via bidirectional mixer, it is converted into signal in any one of IF range and main frequency band range. Also when transmission signal in any of IF range and main frequency band range is passed via bidirectional mixer, it is converted into signal of RF range.

EFFECT: simplicity of RF signal transmission/reception device design, reduced size of microcircuit chip, consumption of low output power, reduced signal-to-signal noise, superb efficiency of wireless communication.

45 cl, 42 dwg

Description

This application claims the priority of Korean Patent Application No. 10-2006-0006938, filed January 23, 2006, Korean Patent Application No. 10-2006-0006939, filed January 23, 2006, Korean Patent Application No. 10-2006-0026606 filed March 23, 2006, Korean Patent Application No. 10-2006-0079912, filed August 23, 2006, and Korean Patent Application No. 10-2006-0079914, filed August 23, 2006, which thereby incorporated by reference as if fully formulated here.

Technical field

The present invention relates to a device for transmitting / receiving a radio frequency (RF) signal and a method for transmitting / receiving a radio frequency signal and, more particularly, to a device for transmitting / receiving a radio frequency (RF) signal, which has a simple structure and excellent characteristics of transmitting / receiving a signal, and a method transmitting / receiving an RF signal using this device.

State of the art

Currently, various wireless communication schemes are used in a mobile phone, for example, global system for type mobile communications (GSM) wireless circuits, code division multiple access (CDMA) and code division multiple access (WCDMA), wireless communication schemes such as wireless local area network (WLAN) and global interoperability for microwave access (Wimax standard), wireless circuits such as ultra-wideband (UWB) and BLUETOOTH, wireless based circuits on a global positioning system (GPS), etc. As a result, there is an increasing demand for wireless transmission / reception chips capable of processing various communication schemes that are small in size, excellent in reception efficiency, and with low power consumption. In addition, the provision of many wireless services includes an increasing demand for a wireless transmit / receive chip that overcomes interference from external signals and is stable in wireless environments.

Figure 1 illustrates an example of a device for transmitting / receiving an RF signal. As shown in this drawing, a conventional device for transmitting and receiving a radio frequency (RF) signal comprises an RF antenna switch 10 connected to the antenna, a reception signal processor 20 and a transmission signal processor 30, typically connected to an RF antenna switch 10, and a frequency synthesizer 40 and a modem 50, typically connected to a receive signal processor 20 and a transmit signal processor 30. The operation of a conventional RF transmission / reception apparatus is described below with reference to FIG.

The RF antenna switch 10 transmits or receives the RF signal so that it is transmitted with low loss between the antenna and the receive signal processor 20 or between the transmit signal processor 30 and the antenna.

The RF antenna switch 10 includes an RF reception bandpass filter and an RF transmission bandpass filter. An RF reception bandpass filter has one terminal connected to an antenna and another terminal connected to a reception signal processor 20, and an RF transmission bandpass filter has one terminal connected to a transmission signal processor 30 and another terminal connected to an antenna. The RF signal transmitted through the antenna and the reception signal processor 20 and the RF signal passed through the transmission signal processor 30 can be separated from each other to a very high degree of frequency separation based on the characteristics of the bandpass filters included in the antenna RF switch 10.

Accordingly, the RF antenna switch 10 separates the RF signal to be supplied to the receive signal processor 20 and the RF signal output from the transmit signal processor 30 from each other so that the RF signal transmission / reception apparatus can transmit and receive RF signals in one and same time.

The RF antenna switch 10 may include a film surround acoustic resonator (FBAR) filter, a surround acoustic wave filter (BAW), a dielectric filter, a lumped parameter LC filter, a low temperature sintered ceramic filter (LTCC), or the like.

The receive signal processor 20 amplifies the signal received through the antenna and the RF antenna switch 10, performs frequency conversion, channel filtering, and variable gain control with respect to the amplified signal and provides the resulting signal to the modem 50.

To this end, the reception signal processor 20 includes a low noise amplifier 21, a first mixer 22, a first filter 23, and a first variable gain amplifier (VGA) 24.

A low noise amplifier 21 amplifies the received signal, and the first mixer 22 downconverts the frequency of the RF signal from the low noise amplifier 21 using an oscillating signal from a frequency synthesizer 40.

The first filter 23 filters the output signal from the first mixer 22 in the intermediate frequency (IF) band or the main frequency band (modulating signal), and the first URA 24 performs gain with adjustable gain in relation to the IF band signal or the main frequency band band from the first filter 23 and provides the resulting signal to the modem 50.

In order to transmit a signal received from the modem 50, the transmit signal processor 30 performs gain with adjustable gain, channel filtering, frequency conversion and power amplification with respect to the received signal and provides the resulting signal to the antenna RF switch 10. For this, the transmit signal processor 30 includes a second URU 34, a second filter 33, a second mixer 32, and a power amplifier (PA, PA) 31.

The second ASD 34 performs gain with an adjustable gain in relation to the received signal, and the second filter 33 filters the output signal from the second ASD 34 in the IF band or the baseband band. The second mixer 32 converts with increasing frequency the frequency of the output signal from the second filter 33, and the PA 31 amplifies the signal with the converted frequency and provides an amplified signal to the antenna RF switch 10.

A frequency synthesizer 40 supplies an oscillating signal to each of the first mixer 22 and the second mixer 32. To this end, the frequency synthesizer 40 includes a PLL phase-locked loop 41 and a local oscillator 42.

The PLL 41 determines a phase, and the local oscillator 42 provides an oscillating signal having a frequency based on a specific phase to each of the first mixer 22 and the second mixer 32. In the following drawings, including FIG. 1, “RF” means an RF band signal, “IF” means the IF band signal, and “BB” means the baseband signal (HRF) (modulating signal).

2 illustrates another example of a conventional RF signal transmission / reception apparatus using an RF switch. The device for transmitting / receiving an RF signal according to FIG. 2 comprises an RF filter 5, a switch 15, a reception signal processor 20, a transmission signal processor 30, a frequency synthesizer 40, and a modem 50.

The operation of the processor 20 of the reception signal, processor 30 of the transmission signal, frequency synthesizer 40, and modem 50 are similar to those described above with reference to FIG.

In the example of FIG. 2, an RF filter 5 filters the RF band signals to be transmitted and received. The switch 15 transmits the RF signal from the RF filter 5 to the receive signal processor 20 or the RF signal from the transmit signal processor 30 to the RF filter 5.

The switch 15 may be implemented as an RF switch that includes a field effect transistor (FET), an adjustable resistive diode, or the like.

Accordingly, in the example of FIG. 2, the RF range signals can be processed in half duplex mode by switching switch 15.

A communication circuit that performs transmission and reception simultaneously using an antenna RF switch, as in FIG. 1, is usually called a duplex circuit, and a communication circuit that performs any one of the (operations) transmission and reception at one time using a switch, as shown in figure 2, usually called a half-duplex circuit (transmission).

However, the conventional RF signal transmission / reception apparatus according to the example of FIG. 1 or FIG. 2 processes the RF range signals to be transmitted and received in a duplex manner using an antenna antenna switch or an RF switch, possibly causing the following problems.

When the RF range signals are duplexed using an RF antenna switch or an RF switch, they may experience losses resulting in a deterioration in reception sensitivity. To compensate for such signal losses, it is necessary to increase the signal power, which leads to an increase in power consumption.

Further, a conventional device for transmitting / receiving an RF signal, as in the example of FIG. 1 or FIG. 2, should have a volumetric and expensive antenna RF switch or switch RF separately from the RF signal transmission / reception chip. In addition, high-performance complex RF circuits are required in the receive signal processor and the transmit signal processor, thereby causing difficulties in designing the receive signal processor and the transmit signal processor circuits and increase the size of the transmit / receive device of the RF signal. In addition, the transmit signal processor and the receive signal processor must also be provided separately, thereby increasing the volume of the RF signal transmitting / receiving apparatus and making its construction complex.

In addition, signal interference can occur between RF circuits in the chip of a conventional RF signal transmission / reception device, resulting in a deterioration in the overall efficiency of the device circuit.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to an RF signal transmission / reception apparatus and an RF signal transmission / reception method that substantially eliminates one or more problems arising from the limitations and disadvantages of the prior art.

The present invention is the provision of a device for transmitting / receiving an RF signal, which is simple in design and capable of reducing interference between signals, and a method for transmitting / receiving an RF signal using it.

Another objective of the present invention is to provide a device for transmitting / receiving an RF signal, which may have a reduced chip size and consume low output power, and a method for transmitting / receiving an RF signal using it.

Another objective of the present invention is to provide a device for transmitting / receiving an RF signal that has excellent wireless communication characteristics and is applicable to various wireless communication systems, and a method for transmitting / receiving an RF signal using it.

Another objective of the present invention is to provide a device for transmitting / receiving an RF signal that can process signals of the main frequency band or signals of the IF band in full duplex mode to transmit and receive RF signals, and a method for transmitting / receiving an RF signal using it.

Additional advantages, objects, and features of the invention are set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination or subsequent practice of the invention. These objectives and other advantages of the invention can be realized and obtained using the design described in detail in the written description and claims, as well as from the accompanying drawings.

In order to solve these problems and achieve other advantages, and in accordance with the object of the invention, which is embodied and described in detail below, a device for transmitting / receiving a radio frequency (RF) signal includes a frequency synthesizer for generating an oscillating signal with a certain frequency, a signal transmitter for generating a signal of the first a frequency range included in any one of the range of the main frequency band and the intermediate frequency range (IF), a signal receiver for receiving a signal of the second frequency range included in any one of the ranges an area of the main frequency band and the IF band and separated from the first frequency band, and a bi-directional mixer for converting the signal of the first frequency band output from the signal transmitter to the RF band signal and, at the same time, the RF band signal to the second frequency band using an oscillating signal issued from a frequency synthesizer.

The signal transmitter may include at least one of a first signal transmitter that transmits a common mode signal of the first frequency band and a second signal transmitter that transmits a quadrature signal of the first frequency band.

The signal receiver may include at least one of a first signal receiver that receives a common-mode signal of a second frequency range, and a second signal receiver that receives a quadrature signal of a second frequency range.

An RF signal transmitting / receiving apparatus may further include an RF filter for filtering RF range signals. The bi-directional mixer can be a double balanced mixer.

In another aspect of the present invention, the device for transmitting / receiving an RF signal includes a frequency synthesizer for generating a waveform of a certain frequency, a signal transmitter for generating a signal of a first frequency band included in any one of the baseband and the IF band, a signal receiver for receiving a signal the second frequency range included in any one of the range of the main frequency band and the IF range, a bi-directional mixer for converting the signal of the first frequency range output from a signal transmitter into an RF band signal and an RF band reception signal into a second frequency band signal using an oscillation signal provided from a frequency synthesizer and a switch for performing a switching operation to transmit a first frequency band signal output from a signal transmitter to a bi-directional mixer or a second frequency band signal converted by a bi-directional mixer to a signal receiver.

The signal transmitter may include at least one of a first signal transmitter that transmits a common mode signal of the first frequency band and a second signal transmitter that transmits a quadrature signal of the first frequency band.

The signal receiver may include at least one of a first signal receiver that receives a common-mode signal of a second frequency range, and a second signal receiver that receives a quadrature signal of a second frequency range.

An RF signal transmitting / receiving apparatus may further include an RF filter for filtering RF range signals. The bi-directional mixer can be a double balanced mixer.

An RF signal transmitting / receiving apparatus may include a frequency synthesizer for generating an oscillating signal of a certain frequency, a signal transmitter for generating a signal of a first frequency band, a signal receiver for receiving a signal of a second frequency band separated from the first frequency band, and a bi-directional mixer for converting the signal of the first the frequency range output from the signal transmitter to the RF range signal and, at the same time, the RF range reception signal to the second frequency range signal using A signal from the frequency synthesizer.

The signal receiver may include a low-pass filter for passing only frequencies of the second range included in the range of the main frequency band, and the signal transmitter includes a band-pass filter for passing only frequencies of the first range included in the IF band.

The signal receiver may include a low-pass filter to pass only the frequencies of the second range included in the range of the main frequency band, and the signal transmitter contains a high-pass filter to pass only the frequencies of the first range included in the IF band.

The signal receiver may include a band-pass filter for transmitting only frequencies of the second range included in the IF band, and the signal transmitter includes a low-pass filter for passing only frequencies of the first band included in the base band band.

The signal receiver may include a first band-pass filter for transmitting only frequencies of the second range included in the IF band, and the signal transmitter includes a second band-pass filter for passing only frequencies of the first band included in the IF band.

The signal receiver may include a band-pass filter for transmitting only frequencies of the second range included in the IF band, and the signal transmitter includes a high-pass filter for passing only frequencies of the first band included in the IF band.

The signal receiver may include a high-pass filter for transmitting only the frequencies of the second range included in the IF band, and the signal transmitter includes a low-pass filter for passing only the frequencies of the first band included in the base band.

The signal receiver may include a high-pass filter to pass only the frequencies of the second range included in the IF band, and the signal transmitter includes a band-pass filter for passing only the frequencies of the first band included in the IF band.

Therefore, the transmission signal and the reception signal can be separated from each other by filtering when the signals are transmitted and received using the range of the main frequency band (modulating signal) and the IF band.

In another aspect of the present invention, the device for transmitting / receiving an RF signal includes a frequency synthesizer for generating an oscillating signal of a certain frequency, a signal transmitter for modulating and outputting a signal of a frequency band included in any of the main frequency band and the IF band, a signal receiver for receiving a signal a range of frequencies included in any of the range of the main frequency band and the IF range, a bi-directional mixer for converting the signal of the frequency range output from the signal transmitter to an RF range signal and, at the same time, an RF range reception signal to a frequency range signal received by a signal receiver using an oscillating signal provided from a frequency synthesizer and a switch for performing a switching operation to transmit a frequency range signal issued from a signal transmitter, to a bi-directional mixer, or a frequency range signal converted by a bi-directional mixer, to a signal receiver.

In another aspect of the present invention, an RF signal transmitting / receiving apparatus includes a frequency synthesizer for generating an oscillating signal of a certain frequency, a bi-directional mixer for converting an RF range receiving signal into a first signal in any one of a baseband and an IF bandwidth using an oscillating signal, issued from the frequency synthesizer, and outputting the converted first signal, a first signal selector for selecting any one of the first signal output from the bi-directional mixer, and the fourth signal to be transmitted, a modem for receiving and demodulating a third signal obtained by processing the first signal, and modulating and outputting a second signal in any one of the main frequency band and the IF band, a second signal selector for selecting any one of the second signal, output from the modem, and the third signal, and the signal transmitter / receiver unit for processing the second signal selected by the second signal selector to output the fourth signal, or processing the first signal selected first with a signal selector to output a third signal, wherein a bi-directional mixer converts the reception signal into a first signal and, at the same time, a fourth signal into an RF band signal.

The signal transmitter / receiver unit may include a low noise amplifier for amplifying the first signal selected by the first signal selector, a filter for filtering the output signal from the low noise amplifier, and a variable gain amplifier for performing variable gain of the output signal from the filter and generating an amplified signal as a third signal.

The signal transmitter / receiver unit may include a low noise amplifier for amplifying the second signal selected by the second signal selector, a filter for filtering the output signal from the low noise amplifier, and a variable gain amplifier for performing a variable gain of the output signal from the filter and outputting the amplified signal as the fourth signal.

The device for transmitting / receiving an RF signal includes a frequency synthesizer for generating an oscillating signal of a certain frequency, a bi-directional mixer for converting an RF signal for receiving an RF range into a first signal in any one of a fundamental frequency band and an IF band using an oscillating signal output from a frequency synthesizer, and issuing a converted first signal, a modem for receiving and demodulating a third signal obtained by processing the first signal, and modulating and issuing a second signal in any one of the baseband frequency band and the IF bandwidth, and a signal transmitter / receiver unit for processing a second signal output from the modem to output a fourth signal, or processing a first signal output from a bi-directional mixer, to output a third signal, wherein the bi-directional mixer converts the reception signal RF band into the first signal and, at the same time, the fourth signal into the RF band signal.

The signal transmitter / receiver unit includes a first amplifier for amplifying a first signal output from a bi-directional mixer, a first signal selector for selecting an output signal from a first amplifier, from an output signal of a first amplifier and a second signal output from a modem, a filter for filtering a signal selected a first signal selector, a second amplifier for performing a variable gain with respect to the output signal from the filter to output a third signal, and a second signal selector for performing a switching operation (switching) to transmit the third signal outputted from the second amplifier to the modem.

Therefore, the half-duplex function can be performed in the main frequency band or the IF band in order to transmit and receive RF signals.

The signal transmitter / receiver unit may include a first signal selector for selecting a second signal output from the modem from a first signal output from a bi-directional mixer and a second signal, a filter for filtering the second signal selected by the first signal selector, a second amplifier for performing amplification with a variable gain relative to the output signal from the filter, for issuing a fourth signal, and a second signal selector for performing a switching operation to transmit the fourth signal, output from the second amplifier, to a bi-directional mixer.

In another aspect of the present invention, a method for transmitting an RF signal includes modulating the signal to be transmitted, filtering the modulated signal to provide a first frequency band signal included in any one of the baseband and IF band, converting only the signal of the first frequency band, from the signals of the frequency range, including the first frequency range and the second frequency range, separated from the first frequency range, into the signal of the RF range and transmitting the signal of the RF range.

In another aspect of the present invention, a method for receiving an RF signal includes receiving an RF band signal, converting a received RF band signal to a second frequency band signal included in any one of the baseband and IF band, filtering the signals of the frequency band including the second a frequency band and a first frequency band separated from the second frequency band to transmit only a signal of the second frequency band, and demodulating a signal of the second frequency band.

In another aspect of the present invention, a method for transmitting / receiving an RF signal includes receiving an RF band signal, modulating and outputting a first frequency band signal included in any one of a baseband band and an IF band, and converting the received RF band signal to a second band signal frequencies included in any one of the range of the main frequency band and the IF band, and, at the same time, the signal of the first frequency band - in the RF band signal.

In another aspect of the present invention, a method for transmitting an RF signal includes modulating and outputting a signal of a frequency band included in the baseband and the IF bandwidth, selecting a modulated signal from the signal in any one of the baseband band and the IF band into which the received an RF band signal, and a modulated signal, converting the selected signal to an RF band signal and transmitting the converted RF band signal.

In another aspect of the present invention, a method for transmitting an RF signal includes receiving an RF band signal, converting a received RF band signal to a frequency band signal included in any one of a baseband and an IF band, selecting a converted signal from said converted signal and a transmission signal from a frequency range included in any one of the range of the main frequency band and the IF range, and demodulating the selected signal.

In another aspect of the present invention, a method for transmitting an RF signal includes receiving a first RF band signal, modulating a transmission signal and outputting a modulated signal as a second signal contained in any one of a baseband and an IF band, converting the first RF band signal to a signal belonging to any one of the range of the main frequency band and the IF band if the first signal is selected from said first signal and said second signal contained in any one ohms from the base band and the IF band, and converting the second signal to an RF band signal if a second signal is selected, and demodulating the signal converted from the first signal, and transmitting the RF band signal converted from the second first signal.

In another aspect of the present invention, a method for transmitting an RF signal includes receiving an RF band signal and outputting it as a first signal in any one of a baseband and an IF band, modulating a signal to be transmitted, and outputting it as a second signal in any one of the range of the main frequency band and the IF band, selecting any one of the first signal and the second signal, performing signal processing including amplification and filtering with respect to the selected signal, switching (ne eklyuchenie) and output the processed signal according to the result issued by selecting and demodulating the signal if the signal is issued by the signal obtained by treating the first signal, and converting to a signal issued by the RF signal band if the issued signal is a signal obtained by processing the second signal.

Therefore, the reception signal and the transmission signal can be processed in a common unit, thereby significantly reducing the volume of the RF signal transmission / reception apparatus. Both the reception signal and the transmission signal can be partially processed together, thus making it possible to miniaturize the RF signal transmission / reception apparatus with an effective structure.

It should be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide an additional explanation of the invention as claimed in the claims.

Brief Description of the Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate embodiment (s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

1 is a diagram illustrating an example of a corresponding RF signal transmission / reception apparatus;

FIG. 2 is a diagram illustrating another relevant example of an apparatus for transmitting / receiving an RF signal; FIG.

3 illustrates an embodiment of an RF signal transmission / reception apparatus according to the present invention;

4 illustrates another embodiment of an RF signal transmission / reception apparatus according to the present invention;

5 illustrates another embodiment of an RF signal transmission / reception apparatus according to the present invention;

6 illustrates another embodiment of an RF signal transmission / reception apparatus according to the present invention;

7 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention;

8 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention;

Fig. 9 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention;

10 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention;

11A and 11B are diagrams illustrating signal transmission and reception operations in the embodiment of FIG. 10, respectively;

12 is a waveform diagram illustrating frequency ranges of signals that pass through a signal transmitter and a signal receiver in FIG. 11A and FIG. 11B;

FIG. 13 is a table illustrating the types of filters that can be provided in the embodiment of FIG. 10;

14 is a flowchart illustrating an operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention;

Fig. 15 is a waveform diagram illustrating frequency ranges of signals that are passed by a signal transmitter and a signal receiver according to Fig. 14;

Fig. 16 is a diagram illustrating an operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention;

FIG. 17 is a waveform diagram illustrating frequency ranges of signals that are passed by a signal transmitter and a signal receiver according to FIG. 16;

Fig. 18 is a diagram illustrating an operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention;

Fig. 19 is a diagram illustrating operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention;

FIG. 20 is a diagram illustrating an operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention; FIG.

21 is a diagram illustrating operation based on the characteristics of a filter according to another embodiment of an RF signal transmission / reception apparatus according to the present invention;

FIG. 22 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention; FIG.

Fig. 23 is a diagram illustrating a modified embodiment of the embodiment of Fig. 22, which processes in-phase and quadrature signals;

Fig. 24 is a diagram illustrating an operation of processing a reception signal in the embodiment of Fig. 22;

FIG. 25 is a diagram illustrating an operation for processing a transmission signal in the embodiment of FIG. 22;

FIG. 26 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention; FIG.

FIG. 27 is a diagram illustrating a modified embodiment of the embodiment of FIG. 26, which processes in-phase and quadrature signals;

FIG. 28 is a diagram illustrating an operation of processing a reception signal in the embodiment of FIG. 26;

FIG. 29 is a diagram illustrating an operation for processing a transmission signal of the embodiment of FIG. 26;

30 is a diagram illustrating a preferred embodiment of a bi-directional mixer in an RF signal transmission / reception apparatus according to the present invention;

31 is a diagram illustrating an alternative embodiment of a bi-directional mixer in an RF signal transmission / reception apparatus according to the present invention;

32 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, which has a notch function of a mirror sideband;

33 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, which has a notch function of a mirror sideband;

Fig. 34 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, which has a notch function of a mirror sideband;

Fig. 35 is a flowchart illustrating a preferred embodiment of an RF signal transmission method according to the present invention;

Fig. 36 is a flowchart illustrating a preferred embodiment of an RF signal receiving method according to the present invention;

37 is a flowchart illustrating a preferred embodiment of an RF signal transmission / reception method according to the present invention;

Fig. 38 is a flowchart illustrating an alternative embodiment of an RF signal transmission method according to the present invention;

Fig. 39 is a flowchart illustrating an alternative embodiment of a method for receiving an RF signal according to the present invention;

40 is a flowchart illustrating an alternative embodiment of an RF signal transmission / reception method according to the present invention;

Fig. 41 is a flowchart illustrating another embodiment of a method for transmitting / receiving an RF signal according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments of the present invention are described below in detail, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings to refer to the same or similar parts.

Below, the term “RF transmit / receive range” refers, as applied to receiving an RF signal, to the frequency range of the RF signal before the signal frequency is converted after the RF signal is received, and, as applied to transmitting the RF signal, to the frequency range of the RF signal to be transmitted after the signal frequency is converted.

Also, below, the term “IF band” refers to all frequency ranges between the RF transmit / receive band and the main frequency band (also called the IF band 0).

3 illustrates an embodiment of an RF signal transmission / reception apparatus according to the present invention. An embodiment of an RF signal transmission / reception apparatus according to the present invention is described below with reference to FIG. 3.

In the present embodiment, the RF signal transmission / reception apparatus is adapted to perform a duplex transmission / reception function in the IF band or the main frequency band, and not in the RF band. To this end, in this embodiment, the RF signal transmission / reception apparatus comprises a bi-directional mixer 300 for converting a signal in any one of the IF band and the main frequency band (or zero IF band) to an RF band signal and vice versa - converting the RF band signal to a signal in any one of the IF range and the baseband range.

The bi-directional mixer 300 receives an oscillating signal of a certain frequency from the local oscillator 210 and converts the signal of the RF range into a signal of any one of the IF range and the range of the main frequency band and, at the same time, vice versa, using the received oscillating signal. As a result, when the received RF band signal is passed through the bi-directional mixer 300, it is converted to a signal in any one of the IF band and the base band band. Also, when a transmission signal of any one of the IF band and the baseband band is passed through the bi-directional mixer 300, it is converted to an RF band signal.

A signal transmitter 500 processes the transmission signal and provides a processed signal in any one of the IF band and the baseband range to the bi-directional mixer 300. The signal receiver 400 receives and processes a signal in any one of the IF band and the baseband band.

An RF signal transmission / reception apparatus according to the present invention can process differential transmission and reception signals. In this context, "differential signals" means signals having a phase difference between them, for example, a common-mode signal and a quadrature signal, which are orthogonal to each other.

4 illustrates an alternative embodiment of an RF signal transmission / reception apparatus according to the present invention, which can process transmission and reception signals in the form of in-phase and quadrature signals. In the present embodiment, the RF signal transmission / reception apparatus is configured to separate the transmission signals and the reception signals of the IF band or the baseband band into common-mode signals and quadrature signals, respectively, and bi-directionally transmit and receive split signals at the same time.

The phase shifting device 250 receives an oscillating signal from the local oscillator 210 and generates two oscillatory signals orthogonal to each other. The first bi-directional mixer 300i bi-directionally converts the in-phase signal of the RF band and the common-mode signal in any one of the IF band and the baseband band at the same time using any of the waveforms from the phase shifter 250.

The second bi-directional mixer 300q bi-directionally converts the quadrature signal of the RF band and the quadrature signal in any one of the IF band or the band of the main frequency band simultaneously using another waveform from the phase shifter 250.

The summing unit 110 sums the in-phase signal of the RF range from the first bidirectional mixer 300i and the quadrature signal of the RF range from the second bidirectional mixer 300q to generate an unbalanced RF signal.

The first signal receiver 400i receives an in-phase signal in any one of the IF band and the baseband range from the first bi-directional mixer 300i, and the second signal receiver 400q receives a quadrature IF band (or main band) from the second bi-directional mixer 300q.

The first signal transmitter 500i transmits the in-phase signal of the IF band (or the main frequency band) to the first bi-directional mixer 300i, and the second signal transmitter 500q transmits a quadrature signal of the IF band (or the main frequency band) to the second bi-directional mixer 300q.

Therefore, the RF signal transmission / reception apparatus according to the present invention can perform a duplex transmission function using signals in any one of the IF band and the base band band.

5 illustrates another embodiment of an RF signal transmission / reception apparatus according to the present invention. An embodiment of an RF signal transmission / reception apparatus according to the present invention is described below with reference to FIG.

In the present embodiment, the RF signal transmitting / receiving apparatus is configured to perform half-duplex transmission functions in the IF band or the main frequency band, and not in the RF band. In this embodiment, the RF signal transmission / reception apparatus comprises a bi-directional mixer 300 for converting a signal in any one of the IF band and the main frequency band band to an RF band signal, or vice versa, converting the RF band signal to a signal in any one of the IF band and range of the main frequency band. And an embodiment of the RF signal transmission / reception apparatus also has a switch 310, a signal receiver 400 and a signal transmitter 500. The switch 310 transmits the output signal from the bidirectional mixer 300 to the signal receiver 400 or the output signal from the signal transmitter 500 to the bidirectional mixer 300. The functions of the signal receiver 400 and the signal transmitter are the same as described with reference to FIGS. 3 and 4.

6 illustrates another embodiment of the present invention. The embodiment shown in FIG. 6 includes a local oscillator 210, a bi-directional mixer 300, a filter 305, a switch 310, a signal receiver 400 and a signal transmitter 500. The embodiment shown in FIG. 6, in addition to the embodiment shown in FIG. 5, includes a filter 305. A filter 305 filters a signal that is converted by a bi-directional mixer 300 and another signal that is provided by a signal transmitter 500 and which has passed the switch 310. The signals filtered by the filter 305 are in any one of the IF band and the baseband band.

As can be seen from the embodiments of FIGS. 5 and 6, the RF signal transmission / reception apparatus according to the present invention can function as a half duplex transmission using signals in any one of the IF band and the base band band. The operation of various embodiments of an RF signal transmission / reception apparatus according to the present invention using the aforementioned bi-directional mixers is described in detail below.

FIG. 7 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, performing a half-duplex transmission function and processing differential signals. The embodiment of FIG. 7 shows an example of an RF signal transmission / reception apparatus that is capable of transmitting and receiving in-phase signals and quadrature signals in a half-duplex manner.

The embodiment of FIG. 7 includes a local oscillator 210, a phase shifter 250, a first bi-directional mixer 300i, a second bi-directional mixer 300q, a switch 320, a first signal receiver 400i, a second signal receiver 400q, a first signal transmitter 500i and a second signal transmitter 500q.

The common-mode signal line associated with the first bi-directional mixer 300i and the quadrature signal line associated with the second bi-directional mixer 300q are selectively connected to the first signal receiver 400i, the second signal receiver 400q, the first signal transmitter 500i and the second signal transmitter 500q according to the ON / OFF operations switches included in the switch 320.

In the embodiment of FIG. 7, the RF signal transmission / reception apparatus may further include at least one of a first reception filter 330i, a second reception filter 330q, a first transmission filter 340i, and a second transmission filter 340q shown in FIG.

The first receive filter 330i filters the common mode signal in any one of the IF band and the baseband range selected by the switch 320, and provides a filtered common mode signal to the first signal receiver 400i.

The first transmission filter 340i filters the common mode signal of any one of the IF band and the baseband range provided from the signal transmitter 500i, and provides a filtered common mode signal to the switch 320.

The second reception filter 330q and the second transmission filter 340q function in the same manner as the first reception filter 330i and the first transmission filter 340i, respectively, except for filtering quadrature signals.

The receive filters 330i and 330q and the transmit filters 340i and 340q can filter signals of the same frequency range or different frequency ranges.

Fig. 8 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention operating in half duplex mode. This embodiment of an RF signal transmission / reception apparatus according to the present invention is described below with reference to FIG. This embodiment of FIG. 8 is similar to the embodiment of FIG. 7.

The first switch 310i is provided to selectively connect the common mode signal line associated with the first bi-directional mixer 300i to any one of the first signal receiver 400i or the first signal transmitter 500i.

A second switch 310q is also provided to selectively connect a quadrature signal line coupled to the second bi-directional mixer 300q to a second signal receiver 400q or a second signal transmitter 500q.

The first switch 310i and the second switch 310q are operable to selectively transmit and receive common mode signals and quadrature signals contained in any one of the IF band and the baseband band, respectively. Therefore, in the embodiment of FIG. 8, the “half duplex function” mode can be implemented in the IF band or the base band.

In the embodiment of FIG. 8, the RF signal transmission / reception apparatus may further include a first transmission / reception filter 305i for filtering in-phase signals between the first bidirectional mixer 300i and the first switch 310i and a second transmission / reception filter 305q for filtering quadrature signals between the second 300q bidirectional mixer and second 310q switch. The first transmit / receive filter 305i and the second transmit / receive filter 305q can filter signals of the same frequency range.

The following is a detailed description of the operations of various embodiments of an RF signal transmission / reception apparatus and an RF signal transmission / reception method according to the present invention.

9 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. The operation of this embodiment of an RF signal transmission / reception apparatus according to the present invention is described below with reference to FIG. 9.

The present embodiment of FIG. 9 includes an RF filter 105, a frequency synthesizer 200, a bi-directional mixer 300, a switch 310, a signal receiver 400, a signal transmitter 500, and a modem 600.

An RF filter 105 filters the input signal to remove noise from frequency band signals other than the RF transmit / receive range from the input signal.

A frequency synthesizer 200 provides an oscillating signal at a certain frequency. To this end, the frequency synthesizer 200 includes a phase locked loop 220 (PLL) and a local oscillator 210.

The bi-directional mixer 300 converts the transmission signal of the first frequency band included in any one of the main frequency band and the IF band to an RF band signal.

At the same time, the bi-directional mixer 300 converts the RF bandwidth reception signal into a second frequency band signal included in any one of the IF band and the main band band.

A switch 310 transmits an output signal from a bi-directional mixer 300 to a signal receiver 400 or an output signal from a signal transmitter 500 to a bi-directional mixer 300 in response to a control signal.

The signal receiver 400 passes only the reception range signal from the output signal from the bi-directional mixer 300. To this end, the signal receiver 400 includes a first filter 410 and a first URA 420.

The first filter 410 passes only the signal from the reception range, and the first URU 420 amplifies with an adjustable gain the output signal from the first filter 410 and provides the resulting signal to the modem 600.

The signal transmitter 500 includes a second ASD 510 and a second filter 520. The second ASD 510 amplifies the output signal from the modem 600 with an adjustable gain, and the second filter 520 filters the output signal from the second ASD 510 into a signal from the transmission range.

The reception range of the signal receiver 400 and the transmission range of the signal transmitter 500 may be the same or separated from each other. Even though the transmission range and the reception range are the same, the transmission signal and the reception signal can be separated from each other based on switching of the switch.

An RF filter 105 is optional in the present invention since it may not be provided in an environment with little interference from external signals.

Embodiments based on filter characteristics are described in detail below. To describe the operation, the processing of an unbalanced signal is given below as an example, although these operations are similarly applied to the processing of differential signals.

10 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. In the present embodiment, the RF signal transmission / reception apparatus comprises an RF filter 105, a frequency synthesizer 200, a bi-directional mixer 300, a signal receiver 400, a signal transmitter 500, and a modem 600.

The operation of this embodiment of an RF signal transmission / reception apparatus according to the present invention, which is capable of performing a duplex transmission function, is described below with reference to FIG. 10.

The RF filter 105 filters the signal supplied to the RF filter to remove interference from signals in ranges other than the RF transmit / receive range.

A frequency synthesizer 200 provides an oscillating signal at a certain frequency. To this end, the frequency synthesizer 200 includes a PLL 220 and a local oscillator 210.

The bi-directional mixer 300 converts the reception signal of the RF band into a signal in any one of the main frequency band and the IF band, and also converts the transmission signal in any one of the main band and IF band into the RF band signal.

The signal receiver 400 passes only the signal from the reception range from the output signal from the bi-directional mixer 300. To this end, the signal receiver 400 includes a first filter 410 and a first URA 420.

The first filter 410 filters the input signal to transmit only the reception range signal. The first URU 420 amplifies, with an adjustable gain, the signal output from the first filter 410 and provides an amplified signal to the modem 600.

The signal transmitter 500 includes a second ASD 510 and a second filter 520. The second ASD 510 amplifies the signal output from the modem 600 with an adjustable gain, and the second filter 520 filters the signal output from the second ASD 510 into a transmission range signal.

The reception range signal of the signal receiver 400 and the transmission range signal of the signal transmitter 500 are separated from each other. Since the frequency range of the signal that the signal receiver 400 passes and the frequency range of the signal output from the signal transmitter 500 are different from each other, the signal output from the bi-directional mixer 300 is not supplied to the signal transmitter 500 and the signal output from the transmitter 500 signal is not supplied to the signal receiver 400.

That is, the transmission range signal that passes the second filter 520 is greatly attenuated in the reception range, and the reception range signal that passes the first filter 410 is greatly attenuated in the transmission range. Therefore, in the embodiment of FIG. 10, the transmission signal and the reception signal are very significantly separated from each other so that the function of the duplex transmission mode can be performed.

An RF filter 105 is optional in an embodiment of the present invention, as it may not be provided in an environment with little interference from external signals.

FIG. 11A illustrates in detail an example of a signal transmission operation according to the embodiment of FIG. 10. To facilitate the description of the embodiment of FIG. 10, it is assumed that the first signal receiver filter 410 is a band-pass filter and the second signal transmitter filter 520 is a low-pass filter. The description below relates to the operating principle of the present embodiment based on this assumption. The IF bandwidth signal passed through the band-pass filter and the baseband signal passed through the low-pass filter are separated from each other. 11A, a signal transmitter 500 receives a signal provided from a modem 600. A second filter 520 of a signal transmitter 500 passes a baseband signal. In contrast, the first filter 410 of the signal receiver 400 transmits an IF bandwidth signal that does not overlap with the main frequency band. As a result, the first filter 410 does not pass the output signal from the transmitter 500 of the signal.

The bi-directional mixer 300 receives a baseband signal from a signal transmitter 500 and converts the received baseband signal into an RF signal using an oscillating signal. Then, the RF filter 105 filters the RF signal from the bi-directional mixer 300 and provides a filtered RF signal to the antenna.

FIG. 11B illustrates in detail an example of a signal receiving operation of the embodiment of FIG. 10. The description below relates to the principle of signal reception of the present embodiment with reference to FIG. 11B.

An RF filter 105 filters the RF signal received through the antenna in a predetermined frequency range and provides a filtered signal, and a bi-directional mixer 300 receives a signal output from the RF filter 105, converts the received signal to a reception range signal using an oscillating signal, and provides a converted signal . Assuming that the reception range is not the main frequency band, the first filter 410 of the signal receiver 400 passes only the reception range signal. The signal passed through the first filter 410 is fed to the modem 600.

In contrast, the second filter 520 in the signal transmitter 500 can only transmit a baseband signal and cannot transmit a reception range signal. As a result, the reception signal issued from the bi-directional mixer cannot be passed through the second filter 520.

FIG. 12 is a waveform diagram illustrating frequency ranges of signals that the signal transmitter and signal receiver of FIG. 11A and FIG. 11B pass. In the embodiment of FIG. 10, a second filter in the signal transmitter passes the baseband signal (Tx LPF, Tx low-pass filter), and a first filter in the signal receiver passes the signal of a specific band from the IF band (Rx BPF, Rx HPF) separated from the main band frequencies. Therefore, in the present embodiment, the duplex function can be performed in the baseband and the IF bandwidth based on the characteristics of the filters in the signal transmitter and signal receiver, so that there is no need to use an RF antenna switch.

FIG. 13 is a table illustrating the types of filters that may be provided at a signal receiver 400 and a signal transmitter 500 in the embodiment of FIG. 10.

In the case where the signal receiver 400 includes a low-pass filter (LPF, low-pass filter) for transmitting a baseband signal, the signal transmitter 500 includes a band-pass filter (BPF, PF) or a high-pass filter (HPF, high-pass) for transmitting a signal IF range separated from the main frequency band.

In the case where the signal receiver 400 includes an IF for transmitting a signal of the first IF band, the signal transmitter 500 includes an LPF for transmitting only a baseband signal separated from the first IF band. Alternatively, the signal transmitter 500 may include an IF or HPF for transmitting only a second IF band signal separated from the first IF band.

In the case where the signal receiver 400 includes an HPF for transmitting a signal of a first IF bandwidth, a signal transmitter 500 includes a LPF for transmitting only a baseband signal separated from a first IF bandwidth, or an IF for transmitting only a second IF bandwidth signal separated from the first IF range.

Therefore, in any embodiments having the aforementioned combinations, a transmission signal in any one of the baseband and IF bandwidth supplied to the bi-directional mixer and a reception signal in any one of the baseband and IF bandwidth output from the bi-directional mixer are Separated from each other in terms of frequency ranges, thus allowing full duplex operation in the IF range.

The operation of various embodiments of the present invention based on the above combinations is described in detail below.

14 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. The embodiment of FIG. 14 is an example of the embodiment of FIG. 10, where the first filter 410 in the signal receiver 400 is a low-pass filter and the second filter 520 in the signal transmitter 500 is a band-pass filter. The frequency range separated from the main frequency band is passed by a band-pass filter.

A signal transmitter 500 filters the signal output from modem 600 through a bandpass filter 520 to provide an IF signal.

A signal receiver 400 filters the output signal from the bi-directional mixer 300 through a low-pass filter 410 so that only the baseband signal is passed.

Since the frequency range of the reception signal between the bi-directional mixer 300 and the receiver 400 of the signal and the frequency range of the transmission signal between the bi-directional mixer 300 and the transmitter 500 are different from each other, the reception signal outputted from the bi-directional mixer 300 is not supplied to the transmitter 500 of the signal, and the signal a transmission issued from the signal transmitter 500 is not provided to the signal receiver 400.

In addition, the embodiment of FIG. 14 is advantageous in that it is not necessary to remove the mirror sideband signal because the signal receiver processes the reception signal in the main frequency band.

Fig. 15 is a waveform diagram illustrating frequency ranges of signals that are passed by a signal transmitter and a signal receiver in the embodiment of Fig. 14. In the present embodiment, the second filter in the signal transmitter, which is a band-pass filter, passes a signal of a specific range (Tx PF) of the IF band. The first filter in the signal receiver, which is a low-pass filter, passes the signal of the main frequency band (Rx low-pass filter), separated from the transmitted range in the signal transmitter. Therefore, in the present embodiment, the duplex function can be implemented in the main frequency band and / or the IF band.

16 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. In the embodiment of FIG. 16, the first filter 410 in the signal receiver 400 and the second filter 520 in the signal transmitter 500 are bandpass filters separated from each other.

The bi-directional mixer 300 converts the RF band reception signal into a first IF band signal and converts the transmission signal of the second IF band to an RF band signal.

The first filter 410 in the receiver 400 of the signal passes only the signal of the first IF band from the output signal from the bi-directional mixer 300.

In contrast, a signal transmitter 500 receives a signal output from a modem 600 and provides a second IF band signal.

In the embodiment of FIG. 16, since both the signal transmitter and the signal receiver transmit and receive signals in the IF band, it is possible to avoid the DC bias problem that may occur when converting the RF signal to the IF band zero signal (baseband).

Further, the embodiment of FIG. 16 is preferred in that it is possible to avoid 1 / f noise that may occur when the CMOS device is used to convert the frequency range.

FIG. 17 is a waveform diagram illustrating frequency ranges of signals that are passed by a signal transmitter and a signal receiver in the embodiment of FIG. 16. In the embodiment of FIG. 16, the second filter in the signal transmitter, which is a band-pass filter, passes the signal of the second IF band (Tx PF), and the first filter in the signal receiver, which is the band-pass filter, passes the signal of the first IF band (Rx PF), separated from the missed range in the signal transmitter.

Therefore, in the embodiment of FIG. 16, the duplex function can be implemented in the IF band.

Fig. 18 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. In the embodiment of FIG. 18, the first filter 410 in the signal receiver 400 and the second filter 520 in the signal transmitter 500 are a high-pass filter and a low-pass filter, separated from each other, respectively.

A signal receiver 400 receives an IF bandwidth signal output from a bi-directional mixer 300 and filters the received signal through a high-pass filter.

In contrast, the signal transmitter 500 receives a signal output from the modem 600 and filters it so that only the baseband signal is separated from the signal filtered by the high-pass filter.

19 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention.

A signal receiver 400 receives an IF bandwidth signal output from a bi-directional mixer 300 and filters the received signal through a high-pass filter.

In contrast, the signal transmitter 500 receives the output signal from the modem 600 and filters it so that only the IF bandwidth signal is separated from the signal filtered by the high-pass filter.

20 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention.

A signal receiver 400 receives a baseband signal output from a bi-directional mixer 300 and filters the received signal through a low-pass filter.

A signal transmitter 500 receives an output signal from modem 600 and filters it so that only the IF bandwidth signal is separated from the signal filtered through a low-pass filter.

21 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention.

A signal receiver 400 receives an IF range signal outputted from a bi-directional mixer 300 and filters the received signal through a band-pass filter.

The signal transmitter 500 filters the output signal from the modem 600 so that only the IF bandwidth signal is separated from the signal filtered through a bandpass filter.

22 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention.

In the present embodiment, the RF signal transmission / reception apparatus comprises a frequency synthesizer 200, a bi-directional mixer 300, a first signal selector 360, a signal transmitter / receiver unit 450, a second signal selector 470 and a modem 600. A frequency synthesizer 200, a bi-directional mixer 300, and a modem 600 are used same as described above.

Exclusively in the embodiment of FIG. 22, the signal transmitter / receiver unit 450 is implemented to perform the functions of both the aforementioned signal receivers 400 and the signal transmitter 500. Accordingly, the signal transmitter / receiver unit 450 is configured to process a reception signal belonging to any one of the baseband and the IF band, and a transmission signal belonging to any one of the baseband and the IF band.

In the embodiment of FIG. 22, a first signal selector 360 and a second signal selector 470 are provided to process both the reception signal and the transmission signal. Since the signal transmitter / receiver unit 450 processes the reception signal or the transmission signal according to the switching state of the first signal selector 360 and the second signal selector 470, the embodiment of FIG. 22 can theoretically provide a half-duplex circuit.

The first signal selector 360 selectively connects the bi-directional mixer 300 to its first transmit terminal 360t for transmitting the signal and to its first receive terminal 360r for receiving the signal. A second signal selector 470 selectively connects the modem 600 to its second receive terminal 470r for receiving the signal and to its second transmit terminal 470t for signal transmission. When the bi-directional mixer 300 is connected to the first transmission terminal 360t, and the modem 600 is connected to the second transmission terminal 470t, a transmission signal from the modem 600 is transmitted to the bi-directional mixer 300 through the signal transmitter / receiver unit 450. When the bi-directional mixer 300 is connected to the first reception terminal 360r, and the modem 600 is connected to the second reception terminal 470r, a reception signal converted by the bi-directional mixer 300 is transmitted to the modem 600 through the signal transmitter / receiver unit 450. Both the transmission signal from the modem 600 and the reception signal converted by the bi-directional mixer 300 belong to the main frequency band or the IF band.

Therefore, according to the embodiment of FIG. 22, it is not necessary that the RF signal transmission / reception apparatus comprises a signal receiver and a signal transmitter separately, so that it can be simplified in design and reduced in size. In this embodiment, the transmitter / receiver unit 450 includes a first amplifier 451, a filter 453, and a second amplifier 455. The first amplifier 451 may be a low noise amplifier, and the second amplifier 455 may be a variable gain amplifier. The operation of the embodiment of FIG. 22 is described below in detail with reference to FIG. 24 and FIG. 25.

FIG. 23 is a diagram illustrating a modified embodiment of the embodiment of FIG. 22, which processes differential signals.

The embodiment of FIG. 23 comprises an in-phase signal transmitter / receiver unit 450i for processing in-phase transmission and reception signals and a quadrature signal transmitter / receiver unit 450q for processing quadrature transmission and reception signals.

The process for processing in-phase and quadrature signals in the embodiment according to FIG. 23 is similar to the process for processing an unbalanced signal. Therefore, since those skilled in the art can implement the embodiment of FIG. 23 based on the embodiment that processes the unbalanced signal, the operation of the embodiment that processes the unbalanced signal is described in detail below with reference to FIG. 24 and FIG. 25.

FIG. 24 is a flowchart illustrating a signal receiving operation in the embodiment of FIG. 22. To facilitate a distinctive description of the signals outputted from the respective elements in FIGS. 22, 23, 26 and 27, the signals are identified by the identifiers “first signal”, “second signal”, “third signal” and “fourth signal”.

In an embodiment of the RF signal transmission / reception apparatus according to the present invention shown in FIG. 22, a bi-directional mixer 300 converts an RF range reception signal into a first signal belonging to any one of a baseband and an IF bandwidth using an oscillating signal from the local oscillator 210 synthesizer 200 frequencies.

To receive the signal in the embodiment of FIG. 22, the first signal selector 360 selects a first reception terminal 360r, and the second signal selector 470 selects a second reception terminal 470r. As a result, the first signal converted by the bi-directional mixer 300 is outputted through the signal transmitter / receiver unit 450 as a third signal, which is then input to the modem 600. The first amplifier 451 of the signal transmitter / receiver unit 450 amplifies the first signal. Filter 453 filters the first signal amplified by the first amplifier 451, and the second amplifier 455 re-amplifies the filtered first signal and provides the re-amplified signal as a third signal. The second output terminal 470r of the reception of the second signal selector 470 transmits a third signal output from the signal transmitter / receiver unit 450 to an analog-to-digital converter (ADC) 610 of the modem 600.

Here, the first amplifier 451 may be a low noise amplifier, and the second amplifier 455 may be a variable gain amplifier. The second reception terminal 470r of the second signal selector 470 transmits the third signal from the signal transmitter / receiver unit 450 to the ADC 610 of the modem 600. Both the first signal and the third signal belong to the main frequency band or the IF band.

FIG. 25 is a flowchart illustrating a signal transmission operation in the embodiment of FIG. 22.

To transmit the signal in the present embodiment, the first signal selector 360 and the second signal selector 470 select the first transmission terminal 360t and the second transmission terminal 470t, respectively.

When the digital-to-analog converter (DAC) 620 of the modem 600 provides a second signal, which is a transmission signal belonging to any one of the main frequency band and the IF band, the second signal is supplied to the signal transmitter / receiver unit 450 via the second transmission terminal 470t of the second selector 470 signals. The first amplifier 451, the filter 453, and the second amplifier 455 of the signal transmitter / receiver unit 450 perform low noise amplification, filtering, and variable gain with respect to the second signal, respectively. Then, the signal transmitter / receiver unit 450 provides a fourth signal to the bi-directional mixer 300 through the first signal selector 360. At this time, the first signal selector 360 selects the first transmission terminal 360t to transmit a fourth signal, which is a transmission signal belonging to the baseband or the IF band, to the bi-directional mixer 300.

Therefore, according to the embodiment shown in FIGS. 20, 22 and 23, the RF signal transmission / reception apparatus can process and output both the reception signal and the transmission signal by the signal transmitter / receiver unit 450 and the switching operations without having to have a separate signal receiver and transmitter signal. Both the second signal and the fourth signal belong to any one of the IF band and the baseband band.

26 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention. The embodiment of FIG. 26 should not include a separate signal transmitter and signal receiver, similar to the embodiment shown in FIGS. 20-23.

In the embodiment of FIG. 26, the RF signal transmission / reception apparatus comprises a frequency synthesizer 200, a bi-directional mixer 300, a signal transmitter / receiver unit 460, and a modem 600. The signal transmitter / receiver unit 460 includes a first amplifier 461, a first signal selector 462, a filter 463, a second amplifier 464 and a second signal selector 465. The signal transmitter / receiver unit 460 processes the reception signal and the transmission signal in various ways by selecting a signal from the first signal selector 462 and the second signal selector 465. The first amplifier 461 may be a low noise amplifier, and the second amplifier 464 may be a variable gain amplifier. The operation of the embodiment of FIG. 26 is described in detail below with reference to FIG. 28 and FIG. 29.

FIG. 27 is a diagram illustrating a modified embodiment of the embodiment of FIG. 26, in which the signal transmitter / receiver unit in FIG. 26 processes differential signals. The embodiment of FIG. 27 comprises a first signal transmitter / receiver unit 460i for processing in-phase transmission and reception signals and a second signal transmitter / receiver unit 460q for processing quadrature transmission and reception signals.

One skilled in the art can also understand and implement the embodiment of FIG. 27 based on the embodiment of FIG. 26, which processes an unbalanced signal. Therefore, the operation of the embodiment of FIG. 26 is described in detail below with reference to FIG. 28 and FIG. 29.

FIG. 28 is a flowchart illustrating a signal receiving operation in the embodiment of FIG.

In the embodiment of FIG. 26, the RF signal transmission / reception apparatus comprises a frequency synthesizer 200, a bi-directional mixer 300, a signal transmitter / receiver unit 460, and a modem 600, as described above. A frequency synthesizer 200, a bi-directional mixer 300, a modem 600 and an ADC 610, and a DAC 620 of a modem 600 are used in the same manner as described above.

The signal transmitter / receiver unit 460 includes a first amplifier 461, a first signal selector 462, a filter 463, a second amplifier 464, and a second signal selector 465. To receive the signal in the embodiment of FIG. 26, the first signal selector 462 of the signal transmitter / receiver unit 460 selects a receive terminal 462r and its second signal selector 465 selects a receive terminal 465r.

When the bi-directional mixer 300 converts the RF bandwidth reception signal into a first signal belonging to any one of the baseband and IF bandwidths, and outputs the converted first signal, the first amplifier 461 amplifies the first signal to reduce the noise figure of the reception signal. The signal amplified by the first amplifier 461 is supplied to a filter 463 through a first signal selector 462. The input signal is filtered by a filter 463, amplified with a variable gain by a second amplifier 464, and then outputted as a third signal. Then the third signal is input into the ADC 610 of the modem 600 through the second signal selector 465. Both the first signal and the third signal belong to the IF band or the main frequency band.

FIG. 29 is a flowchart illustrating a signal transmission operation in the embodiment of FIG. 26. To transmit a signal in the present embodiment, the first signal selector 462 of the signal transmitter / receiver unit 460 selects a transmit terminal 462t, and its second signal selector 465 selects a transmit terminal 465t. A second signal output from the DAC 620 of the modem 600 is supplied to the filter 463 through the transmission terminal 462t of the first signal selector 462.

The input signal is filtered by a filter 463, amplified with a variable gain by a second amplifier 464, and then outputted as a fourth signal. Both the second signal and the fourth signal belong to the IF band or the main frequency band.

The transmission signal according to Fig.29 is not passed through the first amplifier 461, in contrast to the reception signal according to Fig.28. The signal transmitter / receiver unit 460 can process both the reception signal and the transmission signal, as shown in FIGS. 26 and 27. At the same time, the signal transmitter / receiver unit 460 can process the reception signal and the transmission signal in various ways by properly selecting the signals.

30 is a circuit diagram illustrating a preferred embodiment of a bi-directional mixer in an RF signal transmission / reception apparatus according to the present invention.

In this embodiment, the bi-directional mixer is a dual balanced mixer including diodes.

The diode in the signal path changes based on the large LO signal from the local oscillator, so that the RF reception signal and the oscillation signal are mixed to form an IF band signal. Also, the vibrational signal and the IF signal are mixed to form an RF signal. The two outputs a and b of the output of the IF band signal (or the main frequency band) are connected to the virtual ground points of the output of the vibrational signal and the output of the RF signal, respectively, in order to separate the oscillatory signal from the IF band signal (or the main frequency band) and the RF band signal from the signal IF range (or baseband). The oscillation signal and the RF signal are separated from each other by the included diode path, and the output of the oscillation signal and the output of the RF signal are also connected to each other's virtual ground points, thereby making it possible to separate the oscillatory signal from the RF signal.

31 is a circuit diagram illustrating an alternative embodiment of a bi-directional mixer in an RF signal transmission / reception apparatus according to the present invention. In this embodiment, the bi-directional mixer is a dual balanced mixer including transistors.

In the embodiment of the bi-directional mixer of FIG. 31, three signal ports are provided with respect to the RF band signal, the IF band signal and the oscillation signal (LO), respectively, for processing symmetrical signals, where each is divided into a positive component and a negative component. Therefore, it is possible to separate the signals through the respective ports of each other.

32 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, which is capable of performing a notch function of a mirrored sideband when the reception signal is an IF band signal, and performing duplex transmission functions. With reference to FIG. 32, a description will be made of the operation of this embodiment of an RF signal transmission / reception apparatus according to the present invention for removing a side-mirror signal that may occur upon reception of a signal.

In the present embodiment, when the signal receiver receives the signal in the IF band, the received signal may comprise a side mirror signal.

To remove the side-mirror signal, the oscillation signal from the local oscillator 210 of the frequency synthesizer 200 is divided into a common-mode signal (signal I) and a quadrature signal (signal Q) by the first phase shifter 250.

The first bi-directional mixer 300i for signal I and the second bi-directional mixer 300q for signal Q mix the vibrational signals separated by the first phase shifter 250 with the received RF signal, respectively, to produce signals I and Q orthogonal to each other. A quadrature signal (Q signal) is supplied through a BPF_Q filter (PF_Q) to a second phase shifter 443, which then shifts its phase. Block 444 summation removes the signal of the mirror sideband by adding the quadrature signal. The down-converter quadrature converter 445 generates a signal I and a signal Q from an IF signal with a remote specular sideband and provides the generated signal I and signal Q to the ADC. The signals supplied to the ADC are sampled and then input to the digital signal processing unit 605 (DSP). In Fig. 32, the transmitter (Dr_AMP and low-pass filter) of the signal also processes the signal I and the signal Q of the baseband band.

33 is a diagram illustrating another embodiment of an RF signal transmission / reception apparatus according to the present invention, which has a notch function of a mirror sideband. With reference to FIG. 33, a description will be made of the operation of this embodiment of an RF signal transmission / reception apparatus according to the present invention for removing a side-mirror signal that may occur upon reception of a signal.

In the embodiment of FIG. 33, the vibrational signal from the frequency synthesizer 200 is divided into a common mode signal (signal I) and a quadrature signal (signal Q) by the first phase shifter 250.

Frequency downconverters 445i and 445q convert the frequency ranges of the IF band signal I and the IF band signal Q, separated by a signal receiver (PF and AMP), respectively. The signal I and the frequency-converted signal Q are converted to digital signals by an ADC and then input to the DSP 605. In the embodiment of FIG. 33, the side-sideband signal is removed by the summing unit 110 and the DSP 605.

Fig. 34 is a block diagram showing another embodiment of an RF signal transmission / reception apparatus according to the present invention, which has a notch function of a mirror sideband. The embodiment of FIG. 34 is similar to the embodiment of FIG. 33, except for transmitting and receiving RF signals in half duplex mode.

In the embodiment of FIG. 34, the vibrational signal from the frequency synthesizer 200 is divided into a common mode signal (signal I) and a quadrature signal (signal Q) by a phase shifter 250.

The first bi-directional mixer 300i bi-directionally converts the in-phase signal of the RF band and the common-mode signal of the main frequency band. The second bidirectional mixer 300q is used in the same way as the first bidirectional mixer 300i, with the exception of quadrature signal conversion.

The embodiment of FIG. 34 may function as a half duplex transmission due to the fact that it contains a switch 330 that selects a transmit terminal or a receive terminal in response to a control signal from the DSP 605 of the modem 600. To receive the signal, the in-phase signal and the quadrature signal are input into the ADC of the modem 600 through amplifiers 407i and 407q and filters 409i and 409q, respectively. To transmit the signal, the common-mode signal and the quadrature signal from the DACs of the modem 600 are provided by amplifiers 507i and 507q and switch switch 330. The summing unit 110 combines the issued common-mode signal and the quadrature signal and provides a combined RF transmission signal to the antenna. In the embodiment of FIG. 34, the mirror sideband signal is removed by the summing unit 110 and the DSP.

Fig. 35 is a flowchart illustrating a preferred embodiment of an RF signal transmission method according to the present invention. This embodiment of an RF signal transmission method according to the present invention is described below with reference to FIG. 35.

First, the signal to be transmitted is modulated (S210).

The modulated signal is filtered and output as a signal of a first frequency range included in any one of the main frequency band and the IF band (S220).

Only the signal of the first frequency band, from the second frequency band containing the received RF band signal and separated from the first frequency band, and the first frequency band, is converted to the RF band signal (S230).

An RF range signal is transmitted (S240).

Fig. 36 is a flowchart illustrating a preferred embodiment of an RF signal receiving method according to the present invention. The flow chart of FIG. 36 can be easily understood based on the embodiment of FIG. 10. A preferred embodiment of an RF signal receiving method according to the present invention is described below with reference to FIG.

First, an RF band signal is received (S310).

The received RF band signal is converted into a signal of a second frequency band included in any of the main frequency band and the IF band (S320). The frequency range converted in step S320 may comprise a signal for transmission and a received signal. Here, the frequency range of the transmission signal is referred to as a first frequency range.

As a result, the signals of the frequency band including the second frequency band and the first frequency band separated from the second frequency band are filtered so that only the signal of the second frequency band can be skipped (S330).

Then, the signal of the second frequency range is demodulated (S340).

37 is a flowchart illustrating a preferred embodiment of an RF signal transmission / reception method according to the present invention. This embodiment of an RF signal transmission / reception method according to the present invention is described below with reference to FIG.

First, an RF range signal is received (S350).

The signal for transmission is modulated and a modulated signal of a first frequency range included in any one of the main frequency band and the IF band is output (S355).

The received RF band signal is converted to a second frequency band signal included in any one of the main frequency band and the IF band, and at the same time, the signal of the first frequency band is converted to the RF band signal (S360). In the embodiment of FIG. 37, both the signal of the first frequency band and the signal of the second frequency band belong to the main frequency band or the IF band, and the signal of the first frequency band and the signal of the second frequency band can be filtered, respectively, to be separated from each other. According to this embodiment, in accordance with FIG. 37, a duplex transmission function can be performed using baseband and / or IF bandwidth signals.

In the embodiments of FIGS. 33-35, a duplex transmission function may be performed for transmission, reception, and transmission / reception signals.

Fig. 38 is a flowchart illustrating an alternative embodiment of an RF signal transmission method according to the present invention. This embodiment of an RF signal transmission method according to the present invention is described below with reference to FIG. 38.

First, the signal for transmission is modulated, and a modulated signal is provided for a frequency range included in any one of the main frequency band and the IF band (S410).

From a signal in any one of the baseband and the IF band into which the received RF band signal is converted, and the modulated signal, the modulated signal is selected by switching (S420).

The selected signal is converted into a signal of the RF range (S430).

The converted RF range signal is transmitted (S440).

Fig. 39 is a flowchart illustrating an alternative embodiment of an RF signal receiving method according to the present invention. This embodiment of an RF signal receiving method according to the present invention is described below with reference to FIG.

First, an RF band signal is received (S450).

The received RF band signal is converted to a frequency band signal included in any one of the baseband and the IF bands (S460).

From the converted signal and the signal of the frequency range included in any one of the range of the main frequency band and the IF band for transmission, the converted signal is selected by switching (S470).

The selected signal is demodulated (S480).

40 is a flowchart illustrating an alternative embodiment of an RF signal transmission / reception method according to the present invention. This embodiment of an RF signal transmission / reception method according to the present invention is described below with reference to FIG.

First, a first RF band signal is received (S510).

The signal for transmission is modulated and output as a second signal contained in any one of the range of the main frequency band and the IF band (S520).

The first signal of the RF band is converted into a signal belonging to any one of the main frequency band and the IF band if the first signal is selected from the first signal and the second signal contained in any one of the main band and the IF band, and the second signal is converted into a signal RF band if a second signal is selected (S530).

The converted signal belonging to any one of the baseband and the IF band is demodulated, and the converted RF band signal is transmitted (S540).

In the embodiments of FIGS. 36-38, a half-duplex transmission function may be performed for transmission, reception, and transmission / reception signals.

Fig. 41 is a flowchart illustrating another embodiment of an RF signal transmission / reception method according to the present invention, in which a transmission and reception signal can be simultaneously processed when a half-duplex transmission function is performed. To facilitate a distinctive description of the signals in the respective steps, these signals are identified by the identifiers “first signal” and “second signal”. This embodiment of an RF signal transmission / reception method according to the present invention is described below with reference to FIG.

First, an RF band signal is received, converted, and output as a first signal in any one of a baseband band and an IF band (S550).

The signal for transmission is modulated and output as a second signal in any one of the range of the main frequency band and the IF band (S560).

Any of the first signal and the second signal are selected (S570).

Signal processing, including signal amplification and filtering, is performed relative to the selected signal in order to improve the noise characteristics of the selected signal, and the processed signal is switched and output as selected in the aforementioned step S570 (S580).

Signal processing may include low noise gain, filtering, and variable gain. Alternatively, signal processing may include all low noise gain, filtering and variable gain when the first signal is selected, and filtering and variable gain when the second signal is selected.

The issued signal is demodulated if the selected signal is a signal obtained by processing the first signal and converted into an RF band signal, if the selected signal is a signal obtained by processing the second signal (S590).

As is apparent from the foregoing description, the RF signal transmission / reception apparatus and the RF signal transmission / reception method according to the present invention can perform a duplex transmission function using the signals of the IF band and / or the baseband band. Further, the RF signal transmission / reception apparatus according to the present invention can process the transmission signal and the reception signal in the IF band or the main frequency band to a very high degree of frequency separation based on the filter characteristics of the signal transmitter and signal receiver.

The RF signal transmission / reception apparatus and the RF signal transmission / reception method according to the present invention can perform both a duplex transmission function and a half duplex transmission function.

In the RF signal transmission / reception apparatus according to the present invention, it is not necessary to use an expensive RF antenna switch, so that the RF signal transmission / reception apparatus can be reduced in cost. Further, not using an RF antenna switch can reduce the size of the RF transmission / reception device.

The RF signal transmitting / receiving apparatus according to the present invention can be implemented in various embodiments, in which each of the signal receiver and signal transmitter uses any one of a low-pass filter, a band-pass filter and a high-pass filter and separates the frequencies of the reception signal and the transmission signal from each other using the used filters.

Further, the RF signal transmission / reception apparatus according to the present invention can process each of the reception signal and the transmission signal in the form of a single balanced signal or differential signals such as a common mode signal and a quadrature signal.

In addition, the RF signal transmission / reception apparatus of the present invention can simply perform a duplex transmission function using a bi-directional mixer. Therefore, the power consumption of the RF signal transmission / reception apparatus is small, the internal interference of the RF circuit is also small, and the linearity of the signals processed by the transmission / reception apparatus is improved, thereby enabling signal processing that is resistant to external signal interference.

The RF signal transmission / reception apparatus according to the present invention does not use an antenna RF switch, so that its circuit can be easily developed and the device can be manufactured at a low cost and implemented using a single chip.

In addition, the RF signal transmission / reception apparatus and the RF signal transmission / reception method according to the present invention are applicable to wireless local area networks (WLANs), cell phones or communication devices using the UWB system, Zigbee system, Wimax system, BLUETOOTH system, etc. d.

In addition, the RF signal transmission / reception apparatus according to the present invention is low in cost and simple in structure and capable of reducing inter-signal interference. Also, the RF signal transmission / reception apparatus can be reduced with respect to the size of the microcircuit and consume low output power. In addition, the RF signal transmission / reception apparatus has excellent wireless communication efficiency and is applicable to various wireless communication systems.

It will be apparent to those skilled in the art that various modifications and changes may be made to the present invention without departing from the scope or form of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention if they fall within the scope of the appended claims and their equivalents.

Claims (45)

1. A device for transmitting / receiving a radio frequency (RF) signal, comprising
frequency synthesizer for generating an oscillatory signal of a certain frequency; a signal transmitter for issuing a signal of a first frequency range included in any one of a range of a main frequency band and a range of an intermediate frequency (IF);
a signal receiver for receiving a signal of the second frequency range included in any one of the range of the main frequency band and the IF band and separated from the first frequency band; and
a bi-directional mixer for converting a signal of a first frequency range output from a signal transmitter into a signal of an RF range and simultaneously a signal of receiving an RF range into a signal of a second frequency range using an oscillating signal output from a frequency synthesizer. 2. The RF signal transmission / reception apparatus according to claim 1, wherein the signal transmitter comprises at least one of a first signal transmitter that transmits a common mode signal of a first frequency band and a second signal transmitter that transmits a quadrature signal of a first frequency band. 3. The RF signal transmission / reception apparatus according to claim 1, wherein the signal receiver comprises at least one of a first signal receiver that receives a common mode signal of a second frequency range, and a second signal receiver that receives a quadrature signal of a second frequency range. 4. The device for transmitting / receiving an RF signal according to claim 1, further comprising an RF filter for filtering the signals of the RF range. 5. The RF signal transmission / reception apparatus according to claim 1, wherein the bi-directional mixer is a dual balanced mixer. 6. A device for transmitting / receiving an RF signal containing
frequency synthesizer for generating an oscillatory signal of a certain frequency; a signal transmitter for issuing a signal of a first frequency range included in any one of a range of a base frequency band and an IF band;
a signal receiver for receiving a signal of a second frequency range included in any one of the range of the main frequency band and the IF band;
a bi-directional mixer for converting a signal of a first frequency range output from a signal transmitter to an RF range signal and an RF range reception signal into a second frequency range signal using an oscillating signal output from a frequency synthesizer; and
a switch for performing a switching operation to transmit a signal of a first frequency range outputted from a signal transmitter to a bi-directional mixer or a signal of a second frequency range converted by a bi-directional mixer to a signal receiver. 7. The RF signal transmission / reception apparatus according to claim 6, wherein the signal transmitter comprises at least one of a first signal transmitter that transmits a common mode signal of a first frequency range and a second signal transmitter that transmits a quadrature signal of a first frequency range. 8. The device for transmitting / receiving an RF signal according to claim 6, in which the signal receiver comprises at least one of a first signal receiver that receives a common mode signal of a second frequency range, and a second signal receiver that receives a quadrature signal of a second frequency range. 9. The device for transmitting / receiving an RF signal according to claim 6, further comprising an RF filter for filtering the signals of the RF range. 10. The device for transmitting / receiving an RF signal according to claim 6, in which the bi-directional mixer is a double balanced mixer. 11. A device for transmitting / receiving an RF signal containing
frequency synthesizer for generating an oscillatory signal of a certain frequency; a signal transmitter for outputting a signal of a first frequency range;
a signal receiver for receiving a second frequency band signal separated from the first frequency band; and
a bi-directional mixer for converting a signal of a first frequency range output from a signal transmitter into a signal of an RF range and simultaneously a signal of receiving an RF range into a signal of a second frequency range using an oscillating signal output from a frequency synthesizer. 12. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a low-pass filter for passing only frequencies of the second range included in the range of the main frequency band, and the signal transmitter contains a band-pass filter for passing only frequencies of the first range included in IF range 13. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a low-pass filter for passing only frequencies of the second range included in the range of the main frequency band, and the signal transmitter contains a high-pass filter for passing only frequencies of the first range included in the IF range. 14. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a band-pass filter for transmitting only frequencies of the second range included in the IF range, and the signal transmitter contains a low-pass filter for passing only frequencies of the first range included in the main range frequency bands. 15. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a first band-pass filter for passing only frequencies of the second range included in the IF band, and the signal transmitter contains a second band-pass filter for passing only frequencies of the first band included in the band IF 16. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a band-pass filter for transmitting only frequencies of the second range included in the IF band, and the signal transmitter contains a high-pass filter for passing only frequencies of the first band included in the IF band . 17. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a high-pass filter to pass only the frequencies of the second range included in the IF range, and the signal transmitter contains a low-pass filter to pass only the frequencies of the first range included in the range main frequency band. 18. The device for transmitting / receiving an RF signal according to claim 11, in which the signal receiver contains a high-pass filter to pass only the frequencies of the second range included in the IF band, and the signal transmitter contains a band-pass filter for passing only the frequencies of the first band included in the IF band . 19. An apparatus for transmitting / receiving an RF signal, comprising
frequency synthesizer for generating an oscillatory signal of a certain frequency; a signal transmitter for modulating and outputting a signal of a frequency band included in any one of the range of the main frequency band and the IF band;
a signal receiver for receiving a signal of a frequency range included in any one of the range of the main frequency band and the IF band;
a bi-directional mixer for converting a frequency range signal output from the signal transmitter to an RF range signal and, at the same time, an RF range reception signal to a frequency range signal received by a signal receiver using an oscillating signal output from a frequency synthesizer; and
a switch for performing a switching operation to transmit a frequency band signal output from the signal transmitter to a bi-directional mixer, or a frequency band signal converted by a bi-directional mixer, to a signal receiver. 20. The device for transmitting / receiving an RF signal according to claim 19, in which the signal issued from the signal transmitter and the signal received by the signal receiver are in-phase signals. 21. The RF signal transmission / reception apparatus according to claim 20, further comprising a first transmission / reception filter for filtering in-phase signals between the switch and the bi-directional mixer. 22. The device for transmitting / receiving an RF signal according to claim 19, in which the signal output from the signal transmitter and the signal received by the signal receiver are quadrature signals. 23. The RF signal transmission / reception apparatus according to claim 22, further comprising a second transmission / reception filter for filtering quadrature signals between the switch and the bi-directional mixer. 24. The device for transmitting / receiving an RF signal according to claim 19, in which the signal receiver contains
a first signal receiver for receiving an in-phase signal from a frequency band signal converted by a bi-directional mixer; and
a second signal receiver for receiving a quadrature signal from a frequency band signal converted by a bi-directional mixer. 25. The RF signal transmission / reception apparatus according to claim 24, wherein the first signal receiver comprises a first reception filter for channel filtering the received common mode signal. 26. The device for transmitting / receiving an RF signal according to paragraph 24, in which the second signal receiver contains a second receive filter for channel filtering of the received quadrature signal. 27. The device for transmitting / receiving an RF signal according to claim 19, in which the signal transmitter comprises
a first signal transmitter for outputting a common-mode signal from a signal of a frequency range to be provided to a bi-directional mixer; and
a second signal transmitter for outputting a quadrature signal from a signal of a frequency range to be provided to a bi-directional mixer. 28. The RF signal transmission / reception apparatus of claim 27, wherein the first signal transmitter comprises a first transmission filter for channel filtering the common mode signal to be output. 29. The RF signal transmission / reception apparatus according to claim 27, wherein the second signal transmitter comprises a second transmission filter for channel filtering the quadrature signal to be output. 30. A device for transmitting / receiving an RF signal, comprising
frequency synthesizer for generating an oscillatory signal of a certain frequency; a bi-directional mixer for converting an RF bandwidth reception signal to a first signal in any one of a baseband and an IF bandwidth using an oscillation signal provided from a frequency synthesizer and outputting a converted first signal;
a first signal selector for selecting any of the first signal output from the bi-directional mixer and the fourth signal to be transmitted;
a modem for receiving and demodulating a third signal obtained by processing the first signal, and modulating and issuing a second signal in any one of the range of the main frequency band and the IF band;
a second signal selector for selecting any one of a second signal output from the modem and a third signal; and
a signal transmitter / receiver unit for processing a second signal selected by a second signal selector to provide a fourth signal or to process a first signal selected by a first signal selector to generate a third signal,
wherein a bi-directional mixer converts the reception signal into a first signal and, at the same time, a fourth signal into an RF range signal. 31. The device for transmitting / receiving an RF signal according to claim 30, in which the block of the transmitter / receiver of the signal contains
a low noise amplifier for amplifying the first signal selected by the first signal selector;
a filter for filtering the output signal from a low-noise amplifier; and an adjustable gain amplifier for gain with an adjustable gain of the output signal from the filter and outputting the amplified signal as a third signal. 32. The device for transmitting / receiving an RF signal according to clause 30, in which the transmitter / receiver unit of the signal contains
a low noise amplifier for amplifying a second signal selected by a second signal selector;
a filter for filtering the output signal from a low-noise amplifier; and an adjustable gain amplifier for gain with an adjustable gain of the output signal from the filter and outputting the amplified signal as a fourth signal. 33. A device for transmitting / receiving an RF signal, comprising
frequency synthesizer for generating an oscillatory signal of a certain frequency;
a bi-directional mixer for converting an RF bandwidth reception signal to a first signal in any one of a baseband and an IF bandwidth using an oscillation signal provided from a frequency synthesizer and outputting a converted first signal;
a modem for receiving and demodulating a third signal obtained by processing the first signal, and modulating and outputting a second signal of any one of the baseband and the IF band; and
a signal transmitter / receiver unit for processing a second signal output from the modem to output a fourth signal, or processing a first signal output from a bi-directional mixer to output a third signal,
wherein the bi-directional mixer converts the RF range signal into the first signal and, at the same time, the fourth signal into the RF band signal. 34. The device for transmitting / receiving an RF signal according to claim 33, wherein the signal transmitter / receiver unit comprises
a first amplifier for amplifying a first signal output from a bi-directional mixer;
a first signal selector for selecting an output signal from a first amplifier, from an output signal from a first amplifier and a second signal output from a modem;
a filter for filtering the signal selected by the first signal selector; a second amplifier for performing variable gain amplification with respect to the output signal from said filter to provide a third signal; and
a second signal selector for performing a switching operation to transmit a third signal output from the second amplifier to the modem. 35. The device for transmitting / receiving an RF signal according to claim 33, wherein the signal transmitter / receiver unit comprises
a first signal selector for selecting a second signal output from the modem from the first signal output from the bi-directional mixer and the second signal;
a filter for filtering the second signal selected by the first signal selector;
a second amplifier for performing variable-gain amplification of the output signal from said filter to provide a fourth signal; and
a second signal selector for performing a switching operation to transmit a fourth signal output from the second amplifier to the bi-directional mixer. 36. A method for transmitting an RF signal, comprising the steps of: modulating a signal to be transmitted;
filtering the modulated signal to provide a signal of a first frequency range included in any one of the range of the main frequency band and the IF band;
converting only the signal of the first frequency band from the signals of the frequency band including the first frequency band and the second frequency band separated from the first frequency band to the RF band signal; and
transmit an RF range signal. 37. A method for receiving an RF signal, comprising the steps of:
receiving an RF band signal;
converting the received RF band signal to a second frequency band signal included in any one of the IF band and the base band band;
filtering signals of a frequency band including a second frequency band and a first frequency band separated from the second frequency band to transmit only a signal of the second frequency band; and
demodulate the signal of the second frequency range. 38. A method for transmitting / receiving an RF signal, comprising the steps of:
receiving an RF band signal;
modulate and issue a signal of the first frequency range included in any one of the range of the main frequency band and the IF band; and
convert the received signal of the RF range into a signal of the second frequency range included in any one of the range of the main frequency band and the IF range, and, at the same time, the signal of the first frequency range into the signal of the RF range. 39. A method for transmitting an RF signal, comprising the steps of:
modulate and provide a signal of a frequency band included in the range of the main frequency band and the IF band;
selecting a modulated signal from a signal in any one of the baseband and the IF band into which the received RF band signal is converted and the modulated signal;
convert the selected signal into a signal of the RF range; and
transmit the converted RF range signal. 40. A method for receiving an RF signal, comprising the steps of:
receiving an RF band signal;
converting the received signal of the RF band into a signal of a frequency band included in any one of the range of the main frequency band and the IF band;
selecting the converted signal from the converted signal and the transmission signal of the frequency range included in any one of the range of the main frequency band and the IF band; and
demodulate the selected signal. 41. A method for transmitting / receiving an RF signal, comprising the steps of:
receiving a first RF band signal;
modulate the transmission signal and provide a modulated signal as a second signal contained in any one of the range of the main frequency band and the IF band;
converting the first signal of the RF band to a signal belonging to any one of the baseband and IF band, if the first signal is selected, from the first signal and the second signal contained in any one of the main band and the IF band, and converting the second signal to RF range signal if a second signal is selected; and
demodulating a signal converted from the first signal, and transmitting an RF band signal converted from the second first signal. 42. A method for transmitting / receiving an RF signal, comprising the steps of:
receiving an RF band signal and outputting it as a first signal in any one of a baseband band and an IF band;
modulating the signal to be transmitted, and outputting it as a second signal in any one of the baseband and the IF band;
any one of the first signal and the second signal are selected;
performing signal processing including amplification and filtering with respect to the selected signal;
commute and issue a processed signal according to the selection result; and
demodulating the emitted signal if the emitted signal is a signal obtained by processing the first signal, and converting the emitted signal into an RF band signal if the emitted signal is a signal obtained by processing the second signal. 43. A method for transmitting / receiving an RF signal according to claim 42, wherein the step of executing the signal processing comprises
amplification of the selected signal;
amplified signal filtering; and
performing gain with a variable gain in relation to the filtered signal. 44. A method for transmitting / receiving an RF signal according to claim 42, wherein the step of performing signal processing comprises
amplification of the first signal to reduce noise in the signal, if the selected signal is the first signal;
amplified signal filtering; and
performing gain with a variable gain in relation to the filtered signal. 45. A method for transmitting / receiving an RF signal according to claim 42, wherein the step of performing signal processing comprises
filtering the second signal if the selected signal is a second signal; and
performing gain with a variable gain in relation to the filtered signal.

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