JPS6413806A - Automatic frequency control circuit - Google Patents
Automatic frequency control circuitInfo
- 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
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.
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) |
-
1987
- 1987-07-08 JP JP16997287A patent/JPS6413806A/en active Pending
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