KR20010058277A - Transceiver for communication system - Google Patents

Transceiver for communication system Download PDF

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Publication number
KR20010058277A
KR20010058277A KR1019990062510A KR19990062510A KR20010058277A KR 20010058277 A KR20010058277 A KR 20010058277A KR 1019990062510 A KR1019990062510 A KR 1019990062510A KR 19990062510 A KR19990062510 A KR 19990062510A KR 20010058277 A KR20010058277 A KR 20010058277A
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South Korea
Prior art keywords
transmission
voltage controlled
controlled oscillator
transceiver
frequency
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KR1019990062510A
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Korean (ko)
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KR100316903B1 (en
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류찬혁
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이형도
삼성전기주식회사
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Priority to KR1019990062510A priority Critical patent/KR100316903B1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

PURPOSE: A transceiver of a communication system is provided to make a transceiver circuit simple, and decrease the price of a product, by enabling the transceiver to perform transmission and reception operations, using one VCO(Voltage Controlled Oscillator). CONSTITUTION: A transceiver(21) is connected to an antenna. A VCO(22) generates a transmission frequency. A PLL(Phase-Locked Loop)(23) outputs a voltage signal for controlling the VCO(22). An LNA(Low Noise Amplifier)(24) amplifies a received signal. A mixer(25) mixes an output signal of the LNA(24) with the output signals of the VCO(22). An IF(Intermediate Frequency) filter(26) passes only an IF of the output signal of the mixer(25). A demodulator(27) demodulates the output signal of the IF filter(26). A transmission amplifier(28) amplifies the output signal of the demodulator(27) and then supplies it to the transceiver(21).

Description

통신 시스템의 송수신 장치{Transceiver for communication system}Transceiver for communication system

본 발명은 통신 시스템의 송수신 장치에 관한 것으로서, 더욱 상세하게는 송신용 전압제어 발진기 및 수신용 전압제어 발진기 2개를 사용하지 않고 하나의 전압제어 발진기를 이용하여 송수신이 가능하도록 구조를 개선한 통신 시스템의 송수신 장치에 관한 것이다.The present invention relates to a transmission and reception apparatus of a communication system, and more particularly, to improve communication structure by using a single voltage controlled oscillator without using a transmitting voltage controlled oscillator and two receiving voltage controlled oscillators. It relates to a transmitting and receiving device of the system.

현재, 우리나라의 일반 가정에서 사용되고 있는 무선전화기는 FDD 방식을 채택하고 있는데, 통상적으로 송신주파수 및 수신주파수가 일정 주파수 만큼 떨어져 있다.Currently, the radiotelephones used in domestic homes adopt the FDD scheme, and typically, the transmission frequency and the reception frequency are separated by a certain frequency.

도 1은 종래 기술에 의한 통신 시스템에 적용되는 송수신 장치의 구성을 나타내는 블록도이다.1 is a block diagram showing the configuration of a transmission and reception apparatus applied to a communication system according to the prior art.

도 1을 참조하면, 참조번호 11은 안테나와 연결된 송수신기를 나타내고, 12는 수신용 전압제어 발진기(RX VCO)를 나타내고, 13은 송신용 전압제어 발진기(TX VCO)를 나타내고, 14는 상기 수신용 전압제어 발진기(12) 및 송신용 전압제어 발진기(13)를 제어하기 위한 전압신호를 출력하는 듀얼밴드 위상동기루프(PLL)를 나타내고, 15는 수신된 신호를 증폭하는 저잡음 증폭기(LNA)를 나타내고, 16은 상기 저잡음 증폭기(15)의 출력신호와 수신용 전압제어 발진기(12)의 출력신호를 혼합하는 혼합기(mixer)를 나타내고, 17은 상기 혼합기(16)에서 출력되는 신호 중에서 제1 중간주파수(IF) 만을 통과시키는 중간주파수 필터를 나타내고, 18은 상기 중간주파수 필터(17)에서 출력되는 신호를 입력받아 복조를 수행하는 복조기(demodulator)를 나타내고, 19는 상기 송신용 전압제어 발진기(13)의 출력신호를 증폭하여 상기 송수신기(11)로 제공하는 송신 증폭기를 나타낸다.Referring to FIG. 1, reference numeral 11 denotes a transceiver connected to an antenna, 12 denotes a receiving voltage controlled oscillator (RX VCO), 13 denotes a transmitting voltage controlled oscillator (TX VCO), and 14 denotes the receiving type. A dual band phase locked loop (PLL) for outputting a voltage signal for controlling the voltage controlled oscillator 12 and the transmitting voltage controlled oscillator 13 is shown, and 15 represents a low noise amplifier (LNA) for amplifying the received signal. 16 represents a mixer for mixing the output signal of the low noise amplifier 15 and the output signal of the receiving voltage controlled oscillator 12, and 17 represents a first intermediate frequency among the signals output from the mixer 16. (IF) represents an intermediate frequency filter that passes only, 18 represents a demodulator (demodulator) that receives the signal output from the intermediate frequency filter 17 and performs demodulation, and 19 represents the transmission voltage controlled oscillation. And amplifying an output signal 13 represents the transmission amplifier provided in the transmitter 11.

상기와 같은 구성을 갖는 종래 기술이 적용된 통신 시스템의 송수신 장치는 상기 수신용 전압제어 발진기(12) 및 송신용 전압제어 발진기(13)에서 개별적인 수신주파수와 송신주파수를 발생시키기 때문에 회로가 복잡하게 되고, 그에 따라 제품의 가격이 상승하는 문제점이 발생한다.The transmission / reception apparatus of the communication system to which the prior art has the above-described configuration is complicated because the reception voltage controlled oscillator 12 and the transmission voltage controlled oscillator 13 generate separate reception frequencies and transmission frequencies. Therefore, a problem arises in that the price of the product rises.

상기와 같은 종래 기술의 문제점을 해결하기 위한 본 발명의 목적은 하나의 전압제어 발진기를 이용하여 송수신을 수행할 수 있도록 함으로써 회로를 간단하게 하고, 제품의 가격을 낮출 수 있는 통신 시스템의 송수신 장치를 제공하는데 있다.An object of the present invention for solving the problems of the prior art as described above is to provide a transmission and reception apparatus of a communication system that can simplify the circuit by reducing the price of the product by allowing the transmission and reception using a single voltage controlled oscillator To provide.

도 1은 종래 기술에 의한 송수신 장치의 구성을 나타내는 블록도,1 is a block diagram showing the configuration of a transmission and reception apparatus according to the prior art;

도 2는 본 발명의 실시예에 의한 통신 시스템의 송수신 장치의 구성을 나타내는 블록도.2 is a block diagram showing a configuration of a transmission and reception apparatus of a communication system according to an embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

21 : 송수신기 22 : 전압제어 발진기(VCO)21: transceiver 22: voltage controlled oscillator (VCO)

23 : 위상동기루프(PLL) 24 : 저잡음 증폭기(LNA)23: phase locked loop (PLL) 24: low noise amplifier (LNA)

25 : 혼합기(mixer) 26 : 중간주파수 필터25: mixer 26: intermediate frequency filter

27 : 복조기(demodulator) 28 : 송신 증폭기27 demodulator 28 transmit amplifier

상기와 같은 목적을 달성하기 위한 본 발명의 특징은, 송신용 주파수를 발생시키는 전압제어 발진기와, 상기 전압제어 발진기를 제어하기 위한 전압신호를 출력하는 위상동기루프(PLL)와, 증폭된 수신신호와 상기 전압제어 발진기에서 출력된 송신용 주파수를 혼합하는 혼합기(mixer)와, 상기 혼합기에서 출력되는 신호 중에서 제1 중간주파수(IF) 만을 통과시키는 중간주파수 필터와, 상기 중간주파수 필터에서 출력되는 신호를 입력받아 복조를 수행하는 복조기(demodulator)와, 상기 전압제어 발진기에서 출력된 송신용 주파수를 송신단으로 제공하는 송신 증폭기를 포함하되; 상기 제1 중간주파수는 송신주파수와 수신주파수의 차이로 설정되는 통신 시스템의 송수신 장치를 제공하는 데 있다.A feature of the present invention for achieving the above object is a voltage controlled oscillator for generating a transmission frequency, a phase locked loop (PLL) for outputting a voltage signal for controlling the voltage controlled oscillator, and an amplified received signal. And a mixer for mixing the transmission frequency output from the voltage controlled oscillator, an intermediate frequency filter for passing only a first intermediate frequency IF among the signals output from the mixer, and a signal output from the intermediate frequency filter. A demodulator for performing demodulation and a transmission amplifier for providing a transmission frequency output from the voltage controlled oscillator to a transmitter; The first intermediate frequency is to provide a transmitting and receiving device of a communication system set by the difference between the transmission frequency and the reception frequency.

본 발명의 상술한 목적과 여러 가지 장점은 이 기술 분야에 숙련된 사람들에 의해 첨부된 도면을 참조하여 후술되는 발명의 바람직한 실시예로부터 더욱 명확하게 될 것이다.The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 2는 본 발명이 적용된 통신 시스템의 송수신 장치의 구성을 나타내는 블록도이다.2 is a block diagram showing the configuration of a transmission and reception apparatus of a communication system to which the present invention is applied.

도 2를 참조하면, 참조번호 21은 안테나와 연결된 송수신기를 나타내고, 22는 송신용 주파수를 발생시키는 전압제어 발진기(VCO)를 나타내고, 23은 상기 전압제어 발진기(22)를 제어하기 위한 전압신호를 출력하는 위상동기루프(PLL)를 나타내고, 24는 수신된 신호를 증폭하는 저잡음 증폭기(LNA)를 나타내고, 25는 상기 저잡음 증폭기(24)의 출력신호와 전압제어 발진기(22)의 출력신호를 혼합하는 혼합기(mixer)를 나타내고, 26은 상기 혼합기(25)에서 출력되는 신호 중에서 제1 중간주파수(IF) 만을 통과시키는 중간주파수 필터를 나타내고, 27은 상기 중간주파수 필터(26)에서 출력되는 신호를 입력받아 복조를 수행하는 복조기(demodulator)를 나타내고, 28은 상기 전압제어 발진기(22)의 출력신호를 증폭하여 상기 송수신기(21)로 제공하는 송신 증폭기를 나타낸다.2, reference numeral 21 denotes a transceiver connected to an antenna, 22 denotes a voltage controlled oscillator (VCO) generating a transmission frequency, and 23 denotes a voltage signal for controlling the voltage controlled oscillator 22. A phase synchronizing loop (PLL) for outputting, 24 represents a low noise amplifier (LNA) for amplifying a received signal, and 25 represents an output signal of the low noise amplifier 24 and an output signal of the voltage controlled oscillator 22. 26 represents an intermediate frequency filter that passes only the first intermediate frequency IF among the signals output from the mixer 25, and 27 represents an output of the signal output from the intermediate frequency filter 26. A demodulator (demodulator) that receives an input and performs demodulation, 28 represents a transmission amplifier for amplifying the output signal of the voltage-controlled oscillator 22 to the transceiver 21.

결국, 본 발명은 2개의 전압제어 발진기를 사용하지 않고 송신주파수를 발생시키는 하나의 전압제어 발진기를 이용하되, 제1 중간주파수를 송신주파수와 수신주파수의 차이로 설정하도록 한다.As a result, the present invention uses one voltage controlled oscillator for generating a transmission frequency without using two voltage controlled oscillators, but sets the first intermediate frequency to the difference between the transmission frequency and the reception frequency.

상기와 같은 본 발명은 하나의 전압제어 발진기를 이용함으로써 종래 기술의 송수신 장치에 비하여 회로가 간단하게 된다.As described above, the present invention uses a single voltage controlled oscillator, which simplifies the circuit compared to the conventional transceiver device.

이상의 설명에서 본 발명은 특정의 실시예와 관련하여 도시 및 설명하였지만, 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당업계에서 통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다.While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

이상에서 설명한 바와 같은 본 발명이 적용된 통신 시스템의 송수신 장치는 하나의 전압제어 발진기를 이용함으로써 회로가 간단하게 되어 제품의 소형화가 가능하게 되는 동시에 제품의 가격을 낮출 수 있는 효과가 있다.As described above, the transmitting and receiving apparatus of the communication system to which the present invention is applied has the effect of simplifying the circuit by minimizing the product by using one voltage controlled oscillator and reducing the price of the product.

또한, 적은 수의 부품을 사용하게 됨으로써 제품의 생산성을 향상시키게 되는 효과가 있다.In addition, the use of a small number of parts has the effect of improving the productivity of the product.

Claims (1)

송신용 주파수를 발생시키는 전압제어 발진기와, 상기 전압제어 발진기를 제어하기 위한 전압신호를 출력하는 위상동기루프(PLL)와, 증폭된 수신신호와 상기 전압제어 발진기에서 출력된 송신용 주파수를 혼합하는 혼합기(mixer)와, 상기 혼합기에서 출력되는 신호 중에서 제1 중간주파수(IF) 만을 통과시키는 중간주파수 필터와, 상기 중간주파수 필터에서 출력되는 신호를 입력받아 복조를 수행하는 복조기(demodulator)와, 상기 전압제어 발진기에서 출력된 송신용 주파수를 송신단으로 제공하는 송신 증폭기를 포함하는 통신 시스템의 송수신 장치에 있어서,Mixing a voltage controlled oscillator for generating a transmission frequency, a phase locked loop (PLL) for outputting a voltage signal for controlling the voltage controlled oscillator, an amplified received signal and a transmission frequency output from the voltage controlled oscillator A mixer, an intermediate frequency filter for passing only a first intermediate frequency IF among the signals output from the mixer, a demodulator for receiving a signal output from the intermediate frequency filter and performing demodulation; A transmission / reception apparatus of a communication system including a transmission amplifier for providing a transmission frequency output from a voltage controlled oscillator to a transmission end, 상기 제1 중간주파수는 송신주파수와 수신주파수의 차이로 설정된 것을 특징으로 하는 통신 시스템의 송수신 장치.And the first intermediate frequency is set as a difference between a transmission frequency and a reception frequency.
KR1019990062510A 1999-12-27 1999-12-27 Transceiver for communication system KR100316903B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100677851B1 (en) * 2004-04-14 2007-02-08 (주)한국인포콤 Wireless Transceiver apparatus having Transceiver route by one Mixer and band pass filter, and the ASK modulation for data transmitting and frequency conversion in the receving

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100677851B1 (en) * 2004-04-14 2007-02-08 (주)한국인포콤 Wireless Transceiver apparatus having Transceiver route by one Mixer and band pass filter, and the ASK modulation for data transmitting and frequency conversion in the receving

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