JPH0257634U - - Google Patents

Info

Publication number
JPH0257634U
JPH0257634U JP13622388U JP13622388U JPH0257634U JP H0257634 U JPH0257634 U JP H0257634U JP 13622388 U JP13622388 U JP 13622388U JP 13622388 U JP13622388 U JP 13622388U JP H0257634 U JPH0257634 U JP H0257634U
Authority
JP
Japan
Prior art keywords
vco
signal
stop
external pin
stop circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13622388U
Other languages
Japanese (ja)
Other versions
JP2560711Y2 (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1988136223U priority Critical patent/JP2560711Y2/en
Publication of JPH0257634U publication Critical patent/JPH0257634U/ja
Application granted granted Critical
Publication of JP2560711Y2 publication Critical patent/JP2560711Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本考案の一実施例を示す回路図、及
び第２図は従来のＶＣＯ停止回路を示す回路図で
ある。 １９……ＡＭ受信部、２３……比較回路、２７
……停止回路、３０……ＶＣＯ。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional VCO stop circuit. 19...AM receiving section, 23 ...comparison circuit, 27
 ...Stop circuit, 30...VCO.

Claims (1)

【実用新案登録請求の範囲】 (1) ＩＣ内に配置され、ＦＭステレオ放送信号
中に含まれるステレオパイロツト信号に同期して
発振するＶＣＯを、強制的に停止状態にするＶＣ
Ｏ停止回路において、ＦＭ受信時に不使用状態に
なるとともに、高インピーダンス状態を呈する前
記ＩＣの外付ピンと、該外付ピンに制御信号を印
加するマイクロコンピユータと、前記制御信号と
基準電圧とを比較し、停止信号を発生する比較回
路と、前記停止信号に応じて前記ＶＣＯの動作を
停止させる停止回路とを備えることを特徴とする
ＶＣＯ停止回路。 (2) 前記マイクロコンピユータは、そのポート
に小電流で前記基準電圧よりも高い電圧の制御信
号を発生することを特徴とする請求項第１項記載
のＶＣＯ停止回路。 (3) 前記外付ピンは、ＡＭ検波出力信号を得る
為の外付ピンであることを特徴とする請求項第１
項記載のＶＣＯ停止回路。[Claims for Utility Model Registration] (1) A VC that forcibly stops a VCO that is placed in an IC and oscillates in synchronization with a stereo pilot signal included in an FM stereo broadcast signal.
In the O stop circuit, an external pin of the IC that is in an unused state and exhibits a high impedance state when receiving FM, a microcomputer that applies a control signal to the external pin, and a comparison between the control signal and a reference voltage. A VCO stop circuit comprising: a comparison circuit that generates a stop signal; and a stop circuit that stops the operation of the VCO in response to the stop signal. (2) The VCO stop circuit according to claim 1, wherein the microcomputer generates a control signal at a voltage higher than the reference voltage with a small current at its port. (3) Claim 1, wherein the external pin is an external pin for obtaining an AM detection output signal.
VCO stop circuit described in section.
JP1988136223U 1988-10-19 1988-10-19 VCO stop circuit Expired - Lifetime JP2560711Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988136223U JP2560711Y2 (en) 1988-10-19 1988-10-19 VCO stop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988136223U JP2560711Y2 (en) 1988-10-19 1988-10-19 VCO stop circuit

Publications (2)

Publication Number Publication Date
JPH0257634U true JPH0257634U (en) 1990-04-25
JP2560711Y2 JP2560711Y2 (en) 1998-01-26

Family

ID=31396530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988136223U Expired - Lifetime JP2560711Y2 (en) 1988-10-19 1988-10-19 VCO stop circuit

Country Status (1)

Country Link
JP (1) JP2560711Y2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5364512U (en) * 1976-11-01 1978-05-31
JPS5496512U (en) * 1977-12-20 1979-07-07
JPS55105440A (en) * 1979-02-06 1980-08-13 Mitsubishi Electric Corp Semiconductor integrated circuit
JPS6219958A (en) * 1985-07-19 1987-01-28 Hitachi Ltd Semiconductor integrated circuit device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5364512U (en) * 1976-11-01 1978-05-31
JPS5496512U (en) * 1977-12-20 1979-07-07
JPS55105440A (en) * 1979-02-06 1980-08-13 Mitsubishi Electric Corp Semiconductor integrated circuit
JPS6219958A (en) * 1985-07-19 1987-01-28 Hitachi Ltd Semiconductor integrated circuit device

Also Published As

Publication number Publication date
JP2560711Y2 (en) 1998-01-26

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