KR20170032733A - Radio frequency signal transmitter using a frequency devider - Google Patents

Radio frequency signal transmitter using a frequency devider Download PDF

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Publication number
KR20170032733A
KR20170032733A KR1020150130487A KR20150130487A KR20170032733A KR 20170032733 A KR20170032733 A KR 20170032733A KR 1020150130487 A KR1020150130487 A KR 1020150130487A KR 20150130487 A KR20150130487 A KR 20150130487A KR 20170032733 A KR20170032733 A KR 20170032733A
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South Korea
Prior art keywords
frequency
signal
frequency divider
band
radio
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KR1020150130487A
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Korean (ko)
Inventor
박영철
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한국외국어대학교 연구산학협력단
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Priority to KR1020150130487A priority Critical patent/KR20170032733A/en
Publication of KR20170032733A publication Critical patent/KR20170032733A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • H04B1/0071—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using a common intermediate frequency for more than one band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits

Abstract

The present invention relates to a radio signal transmitting apparatus using a frequency divider, in which narrow band components are arranged according to respective required frequencies, and a communication frequency band is flexibly selected using a frequency divider, The manufacturing cost is low, and the resource efficiency is excellent.

Description

[0001] The present invention relates to a radio frequency signal transmitter using a frequency divider,

The present invention relates to a radio signal transmission technology, and more particularly to a radio signal transmission device using a frequency divider.

Korean Patent Laid-Open No. 10-2009-0072632 (2009.07.02) proposes a mobile communication terminal capable of multi-band communication. Conventional multi-band communication devices have various problems in terms of price, size, and resource efficiency by arranging narrowband components according to respective required frequencies and switching the signal paths as necessary to communicate with the required frequency bands there was.

Therefore, the inventor of the present invention can narrow down the device by arranging the narrowband components according to the respective required frequencies and flexibly selecting the communication frequency band using the frequency divider, without switching the signal path if necessary, And to study radio signal transmission devices with excellent resource utilization.

Korean Patent Publication No. 10-2009-0072632 (2009. 07.02)

An object of the present invention is to provide a radio signal transmitting apparatus using a frequency divider capable of downsizing a device by flexibly selecting a communication frequency band using a frequency divider, making it cheap, and having excellent resource utilization.

According to an aspect of the present invention, there is provided a wireless signal transmission apparatus using a frequency divider, including: a modulator for modulating a baseband signal into an intermediate frequency (IF) signal; A first band pass filter (BPF) for filtering an intermediate frequency signal modulated by the modulator and outputting an intermediate frequency band signal in an output range; A mixer for converting an intermediate frequency band signal output from the first band-pass filter to a radio frequency (RF) signal; A frequency divider for dividing a radio frequency signal converted by the mixer into a plurality of divided radio frequency signals; And the like.

According to a further aspect of the present invention, a wireless signal transmission apparatus using the frequency divider includes a second band pass filter (BPF) for passing only a signal of a radio frequency band generated by the frequency divider; And further comprising:

According to a further aspect of the present invention, the frequency divider generates an output signal having an independent magnitude, a half-divided phase, and a half-divided frequency characteristic with respect to an input signal.

The radio signal transmitting apparatus using the frequency divider according to the present invention can flexibly select a communication frequency band using a frequency divider to reduce the size of the apparatus,

1 is a block diagram showing the configuration of a radio signal transmitting apparatus using a frequency divider according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms used throughout the specification of the present invention have been defined in consideration of the functions of the embodiments of the present invention and can be sufficiently modified according to the intentions and customs of the user or operator. It should be based on the contents of.

1 is a block diagram showing the configuration of a radio signal transmitting apparatus using a frequency divider according to an embodiment of the present invention. 1, a radio signal transmitting apparatus 100 using a frequency divider according to this embodiment includes a modulator 110, a first band pass filter (BPF) 120, a mixer 130, and a frequency divider 140.

The modulator 110 modulates a baseband signal into an intermediate frequency (IF) signal. Information such as voice, data, and image to be transmitted is a very low baseband signal, and precisely selects a desired frequency in a process before being transmitted to a high frequency carrier, which is a radio frequency signal radiated through an antenna Modulator 110 to an intermediate frequency (IF) signal.

The first band pass filter (BPF) 120 filters an intermediate frequency signal modulated by the modulator 110 and outputs an intermediate frequency band signal in an output range. The intermediate frequency signal modulated by the modulator 110 is filtered through the first bandpass filter 120 for the desired frequency channel selection.

The mixer 130 converts an intermediate frequency band signal output from the first band-pass filter 120 into a radio frequency (RF) signal. The mixer 130 mixes an intermediate frequency band signal of the output range output by the first band pass filter 120 with a local oscillation signal.

At this time, the frequency up-conversion is performed when the intermediate frequency band signal of the output range is combined with the local oscillation signal, and frequency down conversion is performed when the local oscillation signal is subtracted from the intermediate frequency band signal of the output range.

The frequency divider 140 frequency-divides the radio frequency signal converted by the mixer 130 to generate a plurality of divided radio frequency signals. At this time, the frequency divider 140 may generate an output signal having an independent magnitude, a half-divided phase, and a half-divided frequency characteristic with respect to an input signal.

In the steady state operation of the frequency divider 140, the input waveform x (t) and the output waveform y (t) may be defined as follows.

Figure pat00001

Then, the output waveform z (t) of the mixer 130 can be expressed by the following equation.

Figure pat00002

Here, A represents the voltage gain of the mixer 130.

According to a further aspect of the present invention, the wireless signal transmitting apparatus 100 using the frequency divider may further include a second band pass filter (BPF) 150. The second band-pass filter 150 passes only a signal of a radio frequency band generated by the frequency divider 140.

At this time, the output y 0 (t) of the second bandpass filter 150 can be expressed from the frequency response H (?) And z (t).

Figure pat00003

Equations (1) and (3) show the same waveform, so the size in the ground state must satisfy the following condition.

Figure pat00004

The above equation can be summarized with respect to the frequency response of the second band pass filter 150 to obtain the output maintaining condition of the frequency divider 140 as follows.

Figure pat00005

It can be seen from the above equation that the operating bandwidth of the frequency divider 140 increases as the magnitude of the input signal and the voltage gain of the mixer 130 increase.

In addition, the phase of the output waveform of the frequency divider 140 can be expressed by the following equations from equations (1) and (3).

Figure pat00006

If the above equation is transposed, it is as follows.

Figure pat00007

Therefore, the output of the frequency divider 140 has an independent magnitude, a half-divided phase, and a half-divided frequency characteristic with respect to the input signal as expressed by the following equation.

Figure pat00008

From the above equation, it can be seen that the magnitude of the input signal x (t) of the frequency divider 140 is transferred to the output y (t) in a linear relationship.

Therefore, when the preprocessed input signal x '(t) is constructed as follows using digital signal processing, x (t) and y (t) form a general linear relationship.

Figure pat00009

As a result, the frequency divider 140 can convert the baseband signal to a divided frequency band without additional circuit components.

By implementing such a configuration, the wireless signal transmission apparatus using the frequency divider according to the present invention can flexibly select a communication frequency band using a frequency divider, thereby making it possible to downsize the device, and the manufacturing cost is low and the resource efficiency is excellent. So that the objects of the present invention can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

INDUSTRIAL APPLICABILITY The present invention is industrially applicable in the fields of radio signal transmission technology and its application fields.

100: Radio signal transmitting device
110: modulator
120: first band-pass filter
130: Mixer
140: frequency divider
150: second band-pass filter

Claims (3)

A modulator for modulating a baseband signal into an intermediate frequency (IF) signal;
A first band pass filter (BPF) for filtering an intermediate frequency signal modulated by the modulator and outputting an intermediate frequency band signal in an output range;
A mixer for converting an intermediate frequency band signal output from the first band-pass filter to a radio frequency (RF) signal;
A frequency divider for dividing a radio frequency signal converted by the mixer into a plurality of divided radio frequency signals;
And a frequency divider for dividing the received signal into a plurality of frequency bands. The method according to claim 1,
A radio signal transmitting apparatus using the frequency divider:
A second band pass filter (BPF) for passing only a signal of a radio frequency band generated by the frequency divider;
And a frequency divider for dividing the received signal into a plurality of frequency bands. The method according to claim 1,
Wherein the frequency divider comprises:
And generates an output signal having an independent size, a half-divided phase, and a half-divided frequency characteristic with respect to the input signal.
KR1020150130487A 2015-09-15 2015-09-15 Radio frequency signal transmitter using a frequency devider KR20170032733A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090072632A (en) 2007-12-28 2009-07-02 (주)케이티에프테크놀로지스 Mobile terminal capable of multi band communication and control method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090072632A (en) 2007-12-28 2009-07-02 (주)케이티에프테크놀로지스 Mobile terminal capable of multi band communication and control method thereof

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