JPS6413806A - Automatic frequency control circuit - Google Patents

Automatic frequency control circuit

Info

Publication number
JPS6413806A
JPS6413806A JP16997287A JP16997287A JPS6413806A JP S6413806 A JPS6413806 A JP S6413806A JP 16997287 A JP16997287 A JP 16997287A JP 16997287 A JP16997287 A JP 16997287A JP S6413806 A JPS6413806 A JP S6413806A
Authority
JP
Japan
Prior art keywords
frequency
output
detection means
difference
temperature fluctuation
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
JP16997287A
Other languages
Japanese (ja)
Inventor
Shinjirou Yuasa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16997287A priority Critical patent/JPS6413806A/en
Publication of JPS6413806A publication Critical patent/JPS6413806A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To contrive the improvement of the electric characteristic against temperature fluctuation by cancelling the temperature fluctuation component included in an output of a frequency difference detection means with an output of other frequency detection means having the same constitution and same characteristic as the detection means. CONSTITUTION:The frequency fin of an input signal is converted into a frequency fif by using an output of a local oscillator incorporated in a frequency conversion means 3. The output signal of the means 3 is given to a 1st frequency difference detection means 4 and an output corresponding to a difference between the frequency fif and the reference frequency is obtained. Then a control signal corresponding to the difference between the output of the means 4 and the output of the 2nd frequency difference detection means 6 of the same constitution and characteristic as those of the means 4 and not receiving an output signal of the frequency conversion means 3 is generated by a control signal generating means 7 and sent to the local oscillator. In this case, the difference is obtained to cancel the temperature fluctuation component caused by the temperature characteristic of the means 4, then the effect of the ambient temperature fluctuation is reduced.
JP16997287A 1987-07-08 1987-07-08 Automatic frequency control circuit Pending JPS6413806A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16997287A JPS6413806A (en) 1987-07-08 1987-07-08 Automatic frequency control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16997287A JPS6413806A (en) 1987-07-08 1987-07-08 Automatic frequency control circuit

Publications (1)

Publication Number Publication Date
JPS6413806A true JPS6413806A (en) 1989-01-18

Family

ID=15896224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16997287A Pending JPS6413806A (en) 1987-07-08 1987-07-08 Automatic frequency control circuit

Country Status (1)

Country Link
JP (1) JPS6413806A (en)

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