JPS5520068A - Automatic frequency control circuit featuring wide response band - Google Patents
Automatic frequency control circuit featuring wide response bandInfo
- Publication number
- JPS5520068A JPS5520068A JP9345778A JP9345778A JPS5520068A JP S5520068 A JPS5520068 A JP S5520068A JP 9345778 A JP9345778 A JP 9345778A JP 9345778 A JP9345778 A JP 9345778A JP S5520068 A JPS5520068 A JP S5520068A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- frequency
- signal
- reference signal
- standard
- 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
- 101100002669 Arabidopsis thaliana ADT1 gene Proteins 0.000 abstract 2
- 101100002673 Arabidopsis thaliana ADT3 gene Proteins 0.000 abstract 2
- 101100463170 Schizosaccharomyces pombe (strain 972 / ATCC 24843) pdt1 gene Proteins 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 2
- 101100002671 Arabidopsis thaliana ADT2 gene Proteins 0.000 abstract 1
- 239000000284 extract Substances 0.000 abstract 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
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To increase the pull-in frequency by detecting the fact that the phase synchronization becomes impossible between the input reference signal of the 1st phase comparator and the standard signal and then comparing the control input of the voltage control oscillator with the detection output for output of the control input. CONSTITUTION:Variable frequency oscillator VCO is controlled by the phase difference of the signals between the reference frequency extracted from BPF and the standard frequency. Narrow-band BPF1 extracts the reference signals to give a phase comparison at phase comparator PDT1 between the reference signal and the standard signal. While phase comparator PDT2 gives a phase comparison between the reference signal given from filter BPF2 and the standard signal. Then asynchronization detector USD detects that the phase synchronization becomes impossible between the input reference signal of PDT1 and the standard signal. With this detection output, the control input of VCO is switched SW to the output of the comparator. As a result, the pull-in frequency band can be increased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9345778A JPS5520068A (en) | 1978-07-31 | 1978-07-31 | Automatic frequency control circuit featuring wide response band |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9345778A JPS5520068A (en) | 1978-07-31 | 1978-07-31 | Automatic frequency control circuit featuring wide response band |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5520068A true JPS5520068A (en) | 1980-02-13 |
Family
ID=14082850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9345778A Pending JPS5520068A (en) | 1978-07-31 | 1978-07-31 | Automatic frequency control circuit featuring wide response band |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5520068A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60157335A (en) * | 1984-01-09 | 1985-08-17 | Yokogawa Hewlett Packard Ltd | Frequency converting circuit |
JPS63100820A (en) * | 1986-10-16 | 1988-05-02 | Nec Corp | Automatic frequency control circuit |
-
1978
- 1978-07-31 JP JP9345778A patent/JPS5520068A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60157335A (en) * | 1984-01-09 | 1985-08-17 | Yokogawa Hewlett Packard Ltd | Frequency converting circuit |
JPH0669124B2 (en) * | 1984-01-09 | 1994-08-31 | ヒューレット・パッカード・カンパニー | Harmonic skip prevention method |
JPS63100820A (en) * | 1986-10-16 | 1988-05-02 | Nec Corp | Automatic frequency control circuit |
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