JPS5561111A - Automatic frequency control circuit - Google Patents

Automatic frequency control circuit

Info

Publication number
JPS5561111A
JPS5561111A JP13423978A JP13423978A JPS5561111A JP S5561111 A JPS5561111 A JP S5561111A JP 13423978 A JP13423978 A JP 13423978A JP 13423978 A JP13423978 A JP 13423978A JP S5561111 A JPS5561111 A JP S5561111A
Authority
JP
Japan
Prior art keywords
output
frequency
signal
amplifier
lpf19
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.)
Pending
Application number
JP13423978A
Other languages
Japanese (ja)
Inventor
Yasuo Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13423978A priority Critical patent/JPS5561111A/en
Publication of JPS5561111A publication Critical patent/JPS5561111A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make it possible to reduce or prevent variation in output frequency by separately sampling and holding a FM-modulation output signal component and reference signal output signal and then by performing a subtraction process between both holding outputs.
CONSTITUTION: Low-pass filter 41 extracts the mean value of the output signal of frequency discriminator 17 and sample holding circuit 42 samples and holds an input voltage by sampling pulses supplied when high-frequency switch 21 selects the output of intermediate-frequency amplifier 15. Further, sample holding circuit 43 samples and holds an input voltage by sampling pulses supplied when switch 21 selects the output of reference signal generator 22. The outputs of circuits 42 and 43 are subtracted mutually by deffirential amplifier 45 and its output has a switching signal removed by LPF19 and is supplied as an AFC feedback signal to modulating amplifier 11. In this way, a signal which is in proportion to a difference between the mean value of the output frequency of amplifier 15 and the output frequency of genrator 22 can be obtained at the output side of LPF19.
COPYRIGHT: (C)1980,JPO&Japio
JP13423978A 1978-10-31 1978-10-31 Automatic frequency control circuit Pending JPS5561111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13423978A JPS5561111A (en) 1978-10-31 1978-10-31 Automatic frequency control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13423978A JPS5561111A (en) 1978-10-31 1978-10-31 Automatic frequency control circuit

Publications (1)

Publication Number Publication Date
JPS5561111A true JPS5561111A (en) 1980-05-08

Family

ID=15123658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13423978A Pending JPS5561111A (en) 1978-10-31 1978-10-31 Automatic frequency control circuit

Country Status (1)

Country Link
JP (1) JPS5561111A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191116A (en) * 1983-04-08 1984-10-30 アムペックス　コーポレーション Circuit for reducing afc offset errors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191116A (en) * 1983-04-08 1984-10-30 アムペックス　コーポレーション Circuit for reducing afc offset errors

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