KR970055564A - FM / AM Demodulation Selective PLL Device - Google Patents
FM / AM Demodulation Selective PLL Device Download PDFInfo
- 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
- Authority
- KR
- South Korea
- Prior art keywords
- demodulation
- signal
- discriminator
- output
- pll
- Prior art date
Links
- 230000010355 oscillation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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
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)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950048594A KR100198631B1 (en) | 1995-12-12 | 1995-12-12 | Fm/am demodulation selective type pll |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950048594A KR100198631B1 (en) | 1995-12-12 | 1995-12-12 | Fm/am demodulation selective type pll |
Publications (2)
Publication Number | Publication Date |
---|---|
KR970055564A true KR970055564A (en) | 1997-07-31 |
KR100198631B1 KR100198631B1 (en) | 1999-06-15 |
Family
ID=19439185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019950048594A KR100198631B1 (en) | 1995-12-12 | 1995-12-12 | Fm/am demodulation selective type pll |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR100198631B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100445319B1 (en) * | 1996-02-14 | 2004-11-12 | 소니 가부시끼 가이샤 | Broadcast signal receiving device |
-
1995
- 1995-12-12 KR KR1019950048594A patent/KR100198631B1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100445319B1 (en) * | 1996-02-14 | 2004-11-12 | 소니 가부시끼 가이샤 | Broadcast signal receiving device |
Also Published As
Publication number | Publication date |
---|---|
KR100198631B1 (en) | 1999-06-15 |
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