KR100241215B1 - Dual frequency band transceiver - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a dual band transceiver.

2. The technical gist of the invention to solve

SUMMARY OF THE INVENTION An object of the present invention is to provide a dual band transmission / reception apparatus capable of simplifying a circuit configuration by maximizing sharing of a functional unit that can be shared by a transceiver.

3. Summary of the Solution of the Invention

The present invention provides a frequency oscillation means for oscillating a predetermined frequency signal; First and second downconverting means for downconverting a frequency signal received from the outside into a frequency band corresponding to the predetermined frequency signal; First switching means for selectively transferring frequency signals transmitted from said first and second downconverting means; Second switching means for selectively transferring the frequency signal transmitted through the first switching means; And first and second up-converting means for up-converting the frequency signal transmitted through the second switching means to a frequency band corresponding to the predetermined frequency signal and transmitting the same to the outside. 4. Important uses of the invention

The present invention is used to transmit and receive different frequency bands.

Description

Dual band transceiver

The present invention relates to a device for transmitting and receiving radio frequency, and more particularly, to a dual-band transmitting and receiving device that allows the transmission and reception of different frequency bands as a simple structure by sharing the functional part of the shareable transceiver.

1 is a block diagram of a conventional dual band transceiver.

As shown in FIG. 1, a conventional dual band transceiver includes a first duplexer 11, a first low noise amplifier 12, a frequency oscillator 13, a first down converter 14, First-band filter 15, second down converter 16, second duplexer 17, second low noise amplifier 18, third down converter 20, second frequency oscillator 19 And a second band filter 21, a fourth downward filter 22, a third band filter 23, a first switching unit 24, a baseband processing unit 25, and a second switching unit. 26, first up-converter 27, first filter 28, second up-converter 29, first power amplifier 30, third up-converter 31, A second filter 32, a fourth up-converter 33, and a second power amplifier 34 are provided.

The first frequency oscillator 13 oscillates a frequency of 754 MHz to 779 MHz and transmits it to the first down converter 14 and the second up converter 29, and the second frequency oscillator 19 is 1.4 kHz to The oscillation frequency of 1.5 kHz is transmitted to the third down converter 20 and the fourth up converter 33.

The first and second duplexers 11 and 17 have been used for common use of the antenna 35 for transmission and reception.

Referring to the operation of the conventional dual band transceiver having the structure as described above are as follows.

First, a process of receiving a high frequency signal received through the first duplexer 11 will be described.

The first duplexer 11 transmits the high frequency signal received through the antenna 35 to the first low noise amplifier 12, and the first low noise amplifier 12 is sufficient to receive the high frequency signal transmitted from the first duplexer 11. The signal is amplified and transferred to the first down converter 14.

The first down converter 14 converts the high frequency signal transmitted from the first low noise amplifier 12 into an intermediate frequency signal corresponding to the frequency oscillated from the first frequency oscillator 13 and transmits the converted high frequency signal to the first band filter 15. do. In this case, the first frequency oscillator 13 is an oscillator for oscillating a signal of a desired frequency band and is shared and used by a transmitting and receiving end in the same frequency band.

The first band filter 15 filters the intermediate frequency signal transmitted from the first down converter 14, extracts the corresponding signal, and delivers the signal to the second down converter 16.

The second down converter 16 converts the filtered intermediate frequency signal through the first band filter 15 into a low frequency signal and transmits the converted low frequency signal to the first switching unit 24.

Next, a case where a high frequency signal relatively higher than a high frequency signal received through the first duplexer 11 is received will be described.

The second duplexer 17 transmits the high frequency signal received through the antenna 35 to the second low noise amplifier 18, and the second low noise amplifier 17 is sufficient to receive the high frequency signal transmitted from the second duplexer 17. The signal is amplified and transferred to the third down converter 20.

The third down converter 20 converts the high frequency signal transmitted from the second low noise amplifier 18 into an intermediate frequency signal corresponding to the frequency oscillated from the second frequency oscillator 19 and transmits the converted high frequency signal to the second band filter 21. do. In this case, the second frequency oscillator 19 is an oscillator for oscillating a signal of a desired frequency band and is shared and used by a transmitting and receiving end in the same frequency band.

The second band filter 21 filters the intermediate frequency signal transmitted from the fourth down converter 22, extracts the corresponding signal, and delivers the signal to the fourth down converter 22.

The fourth down converter 22 converts the filtered intermediate frequency signal through the second band filter 15 into a low frequency signal and transmits the low frequency signal to the third band filter 23.

The third band filter 23 filters the low frequency signal transmitted from the fourth down converter 22 and transmits the filtered low frequency signal to the first switching unit 24.

The first switching unit 24 selectively transmits the low frequency signals transmitted from the second down converter 16 and the third band filter 23 to the baseband processor 25. At this time, the first switching unit 24 is automatically switched by using a frequency band arbitrarily switched or searched by the user.

Subsequently, the baseband processing unit 25 converts the low frequency signal transmitted through the first switching unit 24 into a signal that can be recognized by a person, and a signal that can be recognized by a person such as voice or data (fax). Is converted into a low frequency signal and transmitted to the second switching unit 26. In this case, a signal of a low frequency band is transmitted to the second switching unit 26.

A process of converting and transmitting a low frequency signal received through the above process into a signal that can be recognized by a human will be described as follows.

The second switching unit 26 selectively transfers the low frequency signal transmitted from the baseband processor 25 to the first and third upconverters 27 and 31, and the frequency signal received through the first duplexer 11. Is transmitted to the first up-converter 27, and the frequency signal received through the second duplexer 17 is transmitted to the third up-converter 31.

First, a process of transmitting a frequency signal through the first duplexer 11 will be described.

The first up-converter 27 converts the low frequency signal transmitted from the second switching unit 26 into an intermediate frequency signal and transmits the intermediate frequency signal to the first filter 28.

The first filter 28 filters the intermediate frequency signal transmitted from the first up-converter 27, extracts the signal, and transmits the signal to the second up-converter 29.

The second up-converter 29 converts the intermediate frequency signal transmitted from the first filter 28 into a high frequency signal corresponding to the frequency oscillated from the first frequency oscillator 13 and transmits the converted high frequency signal to the first power amplifier 30. .

The first power amplifier 30 amplifies the high frequency signal transmitted from the second up-converter 29 to a sufficient signal and transfers the signal to the first duplexer 11.

Subsequently, the first duplexer 11 filters only the signal capable of transmitting the high frequency signal transmitted from the first power amplifier 30 and transmits the filtered signal through the antenna 35.

Next, a process of transmitting the frequency signal through the second duplexer 17 will be described.

The third up converter 31 converts the low frequency signal transmitted from the second switching unit 26 into an intermediate frequency signal and transmits the converted low frequency signal to the second filter 32.

The second filter 32 filters the intermediate frequency signal transmitted from the third up-converter 31, extracts the corresponding signal, and transmits the signal to the fourth up-converter 44.

The fourth up-converter 44 filters only the high frequency signal corresponding to the frequency oscillated from the second frequency oscillator 19 to the second power amplifier 34 by filtering the intermediate frequency signal transmitted from the second filter 32. .

The second power amplifier 34 amplifies the high frequency signal transmitted from the fourth up-converter 33 into a sufficient signal and transfers the signal to the second duplexer 17.

Subsequently, the second duplexer 17 converts the high frequency signal transmitted from the second power amplifier 34 into a signal capable of transmitting and transmits the signal through the antenna 35.

However, the conventional dual-band transceiver as described above, each having a separate transceiver for each frequency band, and as a result, uses a similar high-frequency circuit portion overlap, resulting in a number of interference signals that can be generated according to the frequency difference In order to minimize the problem was to have a complex structure more than necessary.

Accordingly, the present invention has been made to solve the above-mentioned problems, and by simplifying the circuit configuration by sharing the functional unit that can be shared by the transceiver, the circuit configuration can be simplified. It is an object of the present invention to provide a dual band transmission and reception device capable of generating a frequency to accommodate different frequency bands.

1 is a block diagram of a conventional dual band transceiver.

Figure 2 is a block diagram of an embodiment of a dual band transmission and reception apparatus according to the present invention.

3 is a block diagram of an embodiment of a reception frequency output unit of FIG. 2;

* Explanation of symbols for main parts of the drawings

201: baseband processor 202: wideband low noise amplifier

203: power amplifier 204: antenna

210: first filtering unit 220: frequency oscillator

230: First downconverter 240: Second downconverter

250: first switching unit 260: reception frequency output unit

261: second band filtering unit 262: second switching unit

263: first up-converter 264: second up-converter

270: second filtering unit

In order to achieve the above object, the present invention provides a dual-band transceiver apparatus for receiving a signal transmitted from the outside and transmitting the signal to the baseband processing means and transmitting the signal from the baseband processing means to the outside. First filtering means for filtering the first and second frequency signals; Frequency oscillating means for oscillating predetermined third and fourth frequency signals; First downconverting means for downconverting the first frequency signal filtered through the first filtering means into a frequency band corresponding to the predetermined third frequency signal; Second downconverting means for downconverting the second frequency signal filtered through the first filtering means into a frequency band corresponding to the predetermined fourth frequency signal; First switching means for selectively transferring frequency signals transmitted from said first and second downconverting means; Reception frequency output means for filtering the frequency signal transmitted through the first switching means and outputting the filtered frequency signal to the baseband processing means; First band filtering means for filtering the frequency signal transmitted from the baseband processing means to extract a desired frequency signal; Second switching means for selectively transferring the frequency signal transmitted from the first band filtering means; First up-converting means for up-converting the frequency signal transmitted through the second switching means into a frequency band corresponding to the predetermined third frequency signal; Second up-converting means for up-converting the frequency signal transmitted through the second switching means into a frequency band corresponding to the predetermined fourth frequency signal; And second filtering means for filtering and transmitting the frequency signals transmitted from the first and second up-converters.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 2 and 3.

2 is a block diagram of an embodiment of a shared dual-band transceiver according to the present invention.

As shown in FIG. 2, the dual band transmission / reception apparatus of the present invention includes a first filtering unit 210 for filtering first and second high frequency signals received from the outside, and predetermined third and fourth frequency signals. A first down converter 230 for oscillating the frequency oscillator 220 and a first high frequency signal filtered through the first filtering unit 210 into a low frequency signal corresponding to the predetermined third frequency signal; A second down converter 240 for down-converting the second high frequency signal filtered by the first filtering unit 210 into a low frequency signal corresponding to the predetermined fourth frequency signal, and first and second down conversions; The first switching unit 250 selectively transfers the frequency signals transmitted from the units 230 and 240 and the frequency signals transmitted through the first switching unit 250 to be filtered and output to the baseband processor 201. Reception with the first band filtering unit 265 And a frequency output unit 260. A second band filtering unit 261 for filtering the frequency signal transmitted from the baseband processor 201 and extracting a desired frequency signal, and selectively transmitting the frequency signal transmitted from the second band filtering unit 261. A first up-converter 263 for up-converting the low frequency signal transmitted through the second switch 262 and the second switch 262 into a high frequency signal corresponding to the predetermined third frequency signal; A second up-converter 264 for up-converting the low frequency signal transmitted through the second switching unit 262 into a high-frequency signal corresponding to the predetermined fourth frequency signal, and first and second up-converter 263; And a second filtering unit 270 which filters the frequency signal transmitted from the display unit 264 and transmits the filtered out frequency signal.

The first filtering unit 210 filters the first high frequency signal and transmits the first high frequency signal to the first down converter 230 and the second high frequency signal to filter the second down converter ( And a second filter 212 that passes to 240.

The frequency oscillator 220 oscillates the predetermined third frequency signal and transmits the first frequency oscillator 221 to the first down-converter 230 and the first up-converter 263, and the predetermined fourth. A second frequency oscillator 222 is provided to oscillate the frequency signal and transmit the frequency signal to the second down-converter 240 and the second up-converter 264.

The first frequency oscillator 221 oscillates a frequency of 754MHz to 779MHz, and the second frequency oscillator 222 oscillates a frequency of 1.4kHz to 1.5kHz.

The second filtering unit 270 filters the high frequency signal transmitted from the first up-converter 263 and transmits the third filter 271 and the high frequency signal transmitted from the second up-converter 264. And a fourth filter 272 for filtering and transmitting to the outside.

Referring to the operation of the dual band transceiver of the present invention having the structure as described above in detail as follows.

When the broadband low noise amplifier 202 amplifies the first high frequency signal received through the antenna 204 to a sufficient signal and transmits the first high frequency signal to the first filter 211, the first filter 211 transmits the first high frequency signal. Filtering to transmit a high frequency signal of 869MHz to 894MHz to the first down-conversion unit 230.

Subsequently, the first downconversion unit 230 transmits the high frequency signal of 869 MHz to 894 MHz transmitted from the first filter 211 to the predetermined third frequency signal provided from the first frequency oscillator 221. After converting to the output to the first switching unit 250.

In addition, when the broadband low noise amplifier 202 amplifies the second high frequency signal received through the antenna 204 to a sufficient signal and delivers it to the second filter 212, the second filter 212 is transferred to the second filter 212. The high frequency signal is filtered to transmit a high frequency signal of 1.84 GHz to 1.87 GHz to the second down converter 240.

Subsequently, the second down-conversion unit 240 transmits the high frequency signal of 1.84 kHz to 1.87 kHz transmitted from the second filter 212 to the low frequency signal corresponding to the predetermined fourth frequency signal provided from the second frequency oscillator 222. After converting to the output to the first switching unit 250.

As such, when low frequency signals are transmitted from the first and second down-converters 230, the first switching unit 250 selectively controls the low frequency signals transmitted under the control of a controller (not shown). Transfer to section 265. Subsequently, the first band filtering unit 265 filters the low frequency signal transmitted from the first switching unit 250 and transmits the low frequency signal to the baseband processor 201.

The baseband processor 201 converts a low frequency signal transmitted from the first band filtering unit 265 into a signal that can be recognized by a person, and converts a low frequency signal such as voice or data (fax) into a signal that can be recognized by a person. The signal is converted into a signal and transmitted to the second band filtering unit 261. In this case, a signal of a low frequency band is transmitted to the second band filtering unit 261.

Subsequently, the second band filtering unit 261 filters the low frequency signal transmitted from the baseband processing unit 201 to the second switching unit 262.

In this case, the second switching unit 262 is controlled by the control unit and selectively transfers the low frequency signal transmitted from the second band filtering unit 261 to the first or second up-converters 263 and 264. When the first switching unit 250 selects and outputs the output signal of the first downward change unit 230, the second switching unit 262 converts the output signal of the second band filtering unit 261 to the first up-converting unit ( If the first switching unit 250 selects and outputs the output signal of the second downward change unit 240, the second switching unit 262 is configured to transmit the second band filtering unit 261. The output signal is transmitted to the second up-converter 263.

First, when the second switching unit 262 transfers the low frequency signal output from the second band filtering unit 261 to the first up-converting unit 263, the first up-converting unit 263 may include a second switching unit ( The low frequency signal transmitted through 262 is output to a third filter 271 by outputting a high frequency signal of 824 MHz to 849 MHz corresponding to the predetermined third frequency signal oscillated from the first frequency oscillator 221.

Subsequently, the third filter 271 filters and transmits the high frequency signal transmitted from the first up-converter 263 to the power amplifier 203, and the power amplifier 203 is filtered through the third filter 271. The high frequency signal is amplified to have sufficient power and transmitted to the outside through the antenna 204.

Next, when the second switching unit 262 transfers the low frequency signal output from the second band filtering unit 261 to the second up-converting unit 264, the second up-converting unit 264 converts the second switching unit ( The high frequency signal of 1.75 kHz to 1.78 kHz corresponding to the predetermined fourth frequency signal oscillated from the second frequency oscillator 222 is output to the fourth filter 272.

Subsequently, the fourth filter 272 filters the high frequency signal transmitted from the second up-converter 264 and transmits the filtered high frequency signal to the power amplifier 203, and the power amplifier 203 is filtered through the fourth filter 272. The high frequency signal is amplified to have sufficient power and transmitted to the outside through the antenna 204.

3 is a block diagram of an exemplary embodiment of the reception frequency output unit of FIG. 2.

As shown in FIG. 3, the reception frequency output unit of FIG. 2 includes a band filtering unit 310 for filtering a frequency signal transmitted from the first switching unit 250 and a band filtering unit 310. A switching unit 320 for selectively transmitting the frequency signal, a gain compensation circuit unit 330 for compensating for the gain of the frequency signal transmitted through the switching unit 320, and a frequency signal transmitted through the switching unit 320 The band filtering unit 340 for filtering the signal, the band filtering unit 350 for filtering the frequency signal transmitted through the switching unit 320, the gain compensation circuit unit 330, the band filtering unit 340 and the band filtering unit A switching unit 360 for switching the output signal of the 350 is provided.

The band filtering unit 310 has a wider bandwidth than the band filtering units 340 and 350.

On the other hand, the reception frequency output unit 260 has the configuration as described above, it is possible to output the frequency signal of the various bands to the baseband processing unit 201 through the switching unit 360.

The reception frequency output unit of the dual band transceiver according to the present invention having the shared configuration as described above will be described in detail as follows.

When the output signal of the first down converter 230 or the second down converter 240 is transmitted by the first switching unit 250, the band filtering unit 310 filters the transmitted frequency signal and switches the switching unit 320. Will output

Subsequently, the switching unit 320 is controlled by the control unit to selectively transmit the frequency signal transmitted from the band filtering unit 310 to the gain compensation circuit unit 330, the band filtering unit 340, and the band filtering unit 350. To pass. In this case, the controller controls the selection operation of the switching unit 320 based on the frequency band information transmitted from the baseband processor 201.

When the switching unit 320 transmits the output signal of the band filtering unit 310 to the gain compensation circuit unit 330, the gain compensation circuit unit 330 compensates for the gain of the transmitted frequency signal to provide a base through the switching unit 360. Transfer to the band processing unit 201.

If the switching unit 320 transmits the output signal of the band filtering unit 310 to the band filtering unit 340 or the band filtering unit 350, the band filtering unit 340 or the band filtering unit 350 transmits the output signal. The filtered frequency signal is transmitted to the baseband processor 201 through the switching unit 360. In this case, the controller controls the selection operation of the switching unit 320 to transmit a frequency signal suitable for the bandwidth of the band filtering unit 340 or the band filtering unit 350.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the dual band transmission / reception apparatus of the present invention simplifies the circuit configuration by maximizing the sharing of functional parts that can be shared by the transmission / reception end, thereby reducing the production cost and reducing the volume and weight of the transmission / reception apparatus. By reducing the marketability, and by eliminating unnecessary devices through sharing, there is an effect that can reduce the power consumption, and minimize the generation of internal interference signal.

Claims (14)

In the dual band transmission and reception apparatus for receiving a signal transmitted from the outside and transmitting to the baseband processing means, and transmits the signal from the baseband processing means to the outside, First filtering means for filtering the first and second frequency signals received from the outside; Frequency oscillating means for oscillating predetermined third and fourth frequency signals; First downconverting means for downconverting the first frequency signal filtered through the first filtering means into a frequency band corresponding to the predetermined third frequency signal; Second downconverting means for downconverting the second frequency signal filtered through the first filtering means into a frequency band corresponding to the predetermined fourth frequency signal; First switching means for selectively transferring frequency signals transmitted from said first and second downconverting means; Reception frequency output means for filtering the frequency signal transmitted through the first switching means and outputting the filtered frequency signal to the baseband processing means; First band filtering means for filtering the frequency signal transmitted from the baseband processing means to extract a desired frequency signal; Second switching means for selectively transferring the frequency signal transmitted from the first band filtering means; First up-converting means for up-converting the frequency signal transmitted through the second switching means into a frequency band corresponding to the predetermined third frequency signal; Second up-converting means for up-converting the frequency signal transmitted through the second switching means into a frequency band corresponding to the predetermined fourth frequency signal; And Second filtering means for filtering and transmitting the frequency signals transmitted from the first and second up-converting means to the outside; Dual band transceiver device comprising a. The method of claim 1, The first filtering means, A first filtering unit filtering the first frequency signal and transferring the filtered first frequency signal to the first downconverting means; And A second filtering unit filtering the second frequency signal and transferring the filtered second frequency signal to the second downconverting means; Dual band transceiver device comprising a. The method of claim 2, The first filtering unit, A dual band transmitting and receiving device characterized by outputting a frequency signal of 869MHz to 894MHz. The method of claim 2, The second filtering unit, A dual band transceiver device which outputs a frequency signal of 1.84 GHz to 1.87 GHz. The method of claim 1, The frequency oscillation means, A first frequency oscillator for oscillating the predetermined third frequency signal and transferring the predetermined third frequency signal to the first downconverting means and the first upconverting means; And A second frequency oscillator for oscillating the predetermined fourth frequency signal and transferring it to the second downconverting means and the second upconverting means; Dual band transceiver device comprising a. The method of claim 5, The first frequency oscillator, A dual band transmission and reception apparatus characterized by oscillating a frequency of 754MHz to 779MHz. The method of claim 5, The second frequency oscillator, Dual-band transceiver device characterized in that the oscillation frequency of 1.4 kHz to 1.5 kHz. The method of claim 1, The reception frequency output means, Second band filtering means for filtering the frequency signal transmitted through the first switching means; Dual band transceiver device characterized in that for outputting a frequency signal of one band including. The method of claim 1, The reception frequency output means, Second band filtering means for filtering the frequency signal transmitted from the first switching means; Third switching means for selectively transferring the frequency signal transmitted from said second band filtering means; Gain compensation means for compensating for the gain of the frequency signal transmitted through the third switching means; Third band filtering means for filtering the frequency signal transmitted through the third switching means; Fourth band filtering means for filtering the frequency signal transmitted through the third switching means; And Fourth switching means for switching output signals of the gain compensating means, the third band filtering means and the fourth band filtering means; Dual-band transmission and reception apparatus characterized in that for transmitting the frequency signal of several bands to the baseband processing means. The method of claim 9, The second band filtering means, Dual band transmission and reception device, characterized in that having a wider bandwidth than the third and fourth band filtering means. The method of claim 1, The first upconversion means, A dual band transmission and reception apparatus characterized by outputting a high frequency signal of 824MHz to 849MHz. The method of claim 1, The second upconversion means, A dual band transmitting and receiving device characterized by outputting a high frequency signal of 1.75 GHz to 1.78 GHz. The method of claim 1, The second filtering means, A first filtering unit for filtering and transmitting the frequency signal transmitted from the first up-conversion unit to the outside; And A second filtering unit which filters and transmits the frequency signal transmitted from the second up-conversion unit to the outside Dual band transceiver device comprising a. The method of claim 1, When the first switching means selects and transmits the frequency signal transmitted from the first downconverting means, the second switching means transfers the transmitted frequency signal to the first upconverting means, and vice versa. Means for selecting and transferring the frequency signal transmitted from said second downconverting means, said second switching means transferring said delivered frequency signal to said second upconverting means.

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