KR970055564A - FM / AM Demodulation Selective PLL Device - Google Patents

FM / AM Demodulation Selective PLL Device Download PDF

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Publication number
KR970055564A
KR970055564A KR1019950048594A KR19950048594A KR970055564A KR 970055564 A KR970055564 A KR 970055564A KR 1019950048594 A KR1019950048594 A KR 1019950048594A KR 19950048594 A KR19950048594 A KR 19950048594A KR 970055564 A KR970055564 A KR 970055564A
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KR
South Korea
Prior art keywords
demodulation
signal
discriminator
output
pll
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KR1019950048594A
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Korean (ko)
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KR100198631B1 (en
Inventor
김시현
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문정환
Lg 반도체주식회사
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Priority to KR1019950048594A priority Critical patent/KR100198631B1/en
Publication of KR970055564A publication Critical patent/KR970055564A/en
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Publication of KR100198631B1 publication Critical patent/KR100198631B1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

본 발명은 FM/AM 복조 선택형 PLL 장치에 관한 것으로서, 특히 FM 복조와 AM 복조를 구현시 PLL(Phase Locked Loop)장치의 기능블록을 상호 공유하게 하여 FM 신호와 AM 신호인가시 이를 판별하여 FM복조와 AM복조가 가능한 PLL장치에서 선택적으로 복조가 가능하게 이루어지도록 FM/AM 복조 선택형 PLL 장치에 관한 것이다.The present invention relates to a FM / AM demodulation selective PLL device, and in particular, to implement FM demodulation and AM demodulation, by sharing the functional block of the PLL (Phase Locked Loop) device to determine the FM signal and the AM signal when the FM demodulation The present invention relates to an FM / AM demodulation selective PLL device so that demodulation can be selectively performed in a PLL device capable of AM demodulation.

종래에는 FM 전용 복조 PLL 장치 및 AM 전용 복조 PLL 장치를 사용하므로서, 상기 FM 복조와 AM 복조를 동시에 수행하지 않을 경우에 위상비교기, 저역 필터증폭기, 전압 제어발진기 등 여러개의 기능 블록들을 중복적으로 사용해야만 한다.Conventionally, an FM dedicated demodulation PLL device and an AM dedicated demodulation PLL device are used, and multiple functional blocks such as a phase comparator, a low pass filter amplifier, and a voltage controlled oscillator must be used in duplicate when the FM demodulation and the AM demodulation are not simultaneously performed. Should be.

그러므로 세트(set)를 중복적으로 사용함으로 인한 PCB 상의 면적의 증가와 이로 인한 코스트(cost)의 증가를 초래하는 문제점이 있다.Therefore, there is a problem that the increase of the area on the PCB due to the use of the set (set) and the resulting cost (cost) increases.

따라서 본 발명에 따른 FM/AM 복조 선택형 PLL 장치는 상기한 제반 문제점을 해결하기 위하여 안출된 것으로, FM 및 AM 신호인가시 상기 FM 신호와 AM 신호를 판별하여 각 신호에 해당하는 제어신호를 출력하는 FM/AM 판별기와; 상기 FM/AM 판별기의 AM 복조 제어출력신호에 따라 FM복조 출력하는 FM복조 부와; 상기 FM/AM판별기의 AM복조 제어출력신호에 의해 AM 복조 출력하는 AM 복조부로 구성하여 FM 신호와 AM 신호의 가장 큰 차이인 시간에 따른 진폭변화의 유무를 검사하여 각 내부기능 블록들간의 연결상태를 제어하는 FM/AM 판별기를 부가하여 FM 복조 PLL 장치와 AM 복조 PLL 장치를 하나의 PLL 세트로 구성하므로써 입력되는 신호에 따라 선택적으로 복조가 가능하도록 하여 PCB 상의 면적의 축소와 비용(cost)을 감소시키는데 효과가 있다.Therefore, the FM / AM demodulation selective PLL device according to the present invention is designed to solve the above problems, and when the FM and AM signals are applied, the FM / AM demodulation selectable PLL apparatus discriminates the FM signal and the AM signal and outputs a control signal corresponding to each signal. An FM / AM discriminator; An FM demodulation unit for outputting an FM demodulator according to an AM demodulation control output signal of the FM / AM discriminator; The AM demodulation unit outputs the AM demodulation output according to the AM demodulation control output signal of the FM / AM discriminator, and checks whether there is an amplitude change according to time, which is the largest difference between the FM signal and the AM signal, and connects each internal functional block. By adding FM / AM discriminator to control the state, the FM demodulation PLL device and AM demodulation PLL device are configured as one PLL set to selectively demodulate according to the input signal, thereby reducing the area and cost on the PCB. It is effective in reducing

Description

에프엠/에이엠 복조 선택형 피엘엘장치FM / AM Demodulation

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 FM/AM 복조 선택형 PLL장치의 블록구성도를 나타낸 도면.1 is a block diagram showing an FM / AM demodulation selective PLL device according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : FM/AM 판별기 20 : 위상비교기10: FM / AM discriminator 20: Phase comparator

30,80 : 제 1, 2 저역필터 40,90 : 제 1, 2 증폭기30,80: 1st, 2nd low pass filter 40,90: 1st, 2nd amplifier

50 : 전압제어 발진기 60 : 90°위상추이기50: voltage controlled oscillator 60: 90 ° phase shifter

70 : 혼합기 100 : FM 복조부70: mixer 100: FM demodulator

200 : AM복조 제어신호 IFM : FM복조 제어신호200: AM demodulation control signal IFM: FM demodulation control signal

IAM : AM복조 제어신호IAM: AM demodulation control signal

Claims (3)

FM 및 AM 신호인가시 상기 FM 신호와 AM 신호를 판별하여 각 신호에 해당하는 제어 시호를 출력하는 FMAM 판별기와; 상기 FM/AM 판별기의 FM 복조 제어 출력신호에 따라 FM 복조 출력하는 FM 복조부와; 상기 FM/AM 판별기의 AM 복조 제어 출력신호에 의해 AM 복조 출력하는 FM 복조부로 이루어짐을 특징으로 하는 FM /AM 복조 선택형 PLL장치.An FMAM discriminator for discriminating the FM signal and the AM signal when the FM and AM signals are applied and outputting control signals corresponding to the respective signals; An FM demodulation unit for outputting an FM demodulation according to the FM demodulation control output signal of the FM / AM discriminator; And an FM demodulation unit for AM demodulating and outputting the signal according to the AM demodulation control output signal of the FM / AM discriminator. 제1항에 있어서, 상기 FM 복조부는 상기 FM/AM 판별기에서 입력시호가 FM신호하고 판별되어 FM 복조 제어 신호를 출력하면 사이 신호를 인가 받아 스위치가 온 되어 FM 복조를 위한 발진주파수를 발생시키는 전압 제어 발진기와; 상기 전압 제어 발진기의 출력신호와, 상기 FM/AM 판별기의 입력시호와의 위상을 비교 출력하는 위상비교기와; 상기 위상 비교기에서 출력되는 주파수신호중 저주파수 대역만을 통과하여 출력하는 제1 저역필터와; 상기 제1저역필터에서 출력되는 신호를 증폭하는 제1증폭기와; 상기 제1증폭기에서 출력되는 증폭된 신호중 DC성분을 콘덴서에서 제거하여 FM복조 출력을 얻도록 구성됨을 특징으로 하는 FM/AM 복조 선택형 PLL 장치.According to claim 1, wherein the FM demodulator is input signal is determined by the FM / AM discriminator FM signal and outputs the FM demodulation control signal is switched on by receiving a signal to generate an oscillation frequency for FM demodulation A voltage controlled oscillator; A phase comparator for comparing and outputting a phase between an output signal of the voltage controlled oscillator and an input signal of the FM / AM discriminator; A first low pass filter for outputting only a low frequency band of the frequency signals output from the phase comparator; A first amplifier for amplifying the signal output from the first low pass filter; FM / AM demodulation selectable PLL device, characterized in that configured to remove the DC component of the amplified signal output from the first amplifier to obtain an FM demodulation output. 제1항에 있어서, 상기 AM 복조부는 상기 FM/AM 판별기에서 출력되는 AM복조 제어신호를 인가 받아 스위치가 온 되고 상기 FM 복조부의 전압제어발진기에서 출력되는 발진주파수신호의 위상을 90°추이시키는 90°위상추이기와; 상기 90°위상추이기에서 출력되는 신호와, 입력신호를 적당한 크기의 신호로 혼합 조정하여 중간 주파수신호를 만드는 혼합기와; 상기 혼합기에서 출력되는 중간주파수신호중 저주파수 대역의 주파수만을 통과시키는 제2저역필터와; 상기 제2저역필터를 통과한 신호를 증폭하여 AM 복조출력을 얻도록 한 제 2 증폭기로 구성됨을 특징으로 하는 FM/AM 복조 선택형 PLL 장치.The AM demodulator of claim 1, wherein the AM demodulator is turned on by receiving an AM demodulation control signal output from the FM / AM discriminator and shifts the phase of the oscillation frequency signal output from the voltage controlled oscillator of the FM demodulator by 90 °. 90 ° phase shifter; A mixer configured to mix and adjust the signal output from the 90 ° phase shifter and the input signal into a signal having an appropriate magnitude to produce an intermediate frequency signal; A second low pass filter for passing only a frequency of a low frequency band among the intermediate frequency signals output from the mixer; And a second amplifier configured to amplify the signal passing through the second low pass filter to obtain an AM demodulation output. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950048594A 1995-12-12 1995-12-12 Fm/am demodulation selective type pll KR100198631B1 (en)

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KR1019950048594A KR100198631B1 (en) 1995-12-12 1995-12-12 Fm/am demodulation selective type pll

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KR1019950048594A KR100198631B1 (en) 1995-12-12 1995-12-12 Fm/am demodulation selective type pll

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KR100198631B1 KR100198631B1 (en) 1999-06-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100445319B1 (en) * 1996-02-14 2004-11-12 소니 가부시끼 가이샤 Broadcast signal receiving device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100445319B1 (en) * 1996-02-14 2004-11-12 소니 가부시끼 가이샤 Broadcast signal receiving device

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KR100198631B1 (en) 1999-06-15

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