JPS57150232A - Phase synchronizing loop - Google Patents
Phase synchronizing loopInfo
- Publication number
- JPS57150232A JPS57150232A JP56036286A JP3628681A JPS57150232A JP S57150232 A JPS57150232 A JP S57150232A JP 56036286 A JP56036286 A JP 56036286A JP 3628681 A JP3628681 A JP 3628681A JP S57150232 A JPS57150232 A JP S57150232A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- frequency dividing
- old
- circuit
- dividing ratio
- 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
- 230000010355 oscillation Effects 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
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/101—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To shorten a lockup time of a PLL, by providing a gate circuit for reading away an input waveform. CONSTITUTION:When reference frequency f'r is set to f'r=M.fr (fr: old reference frequency, M: natural number), and a frequency dividing ratio of a programmable frequency dividing circuit is set to N/M, the same oscillation frequency as old frequency can be obtained, and also the frequency dividing ratio becomes 1/M as compared with its old ratio, therefore, natural angle frequency of a PLL and lockup time are shortened to M<1/2> times and 1/M<1/2>, respectively. In this state, however, the frequency dividing ratio N/M of the programmable frequency dividing circuit does not always become an integer and the frequency cannot be divided, therefore, a gate circuit 17 is provided, an output of a voltage control oscillator 13 is read away, and the remaining waveform output is divided by the programmable frequency dividing circuit 14. In this way, its apparent frequency dividing ratio becomes N/M, and the lockup time is shortened to 1/M<1/2>.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56036286A JPS57150232A (en) | 1981-03-12 | 1981-03-12 | Phase synchronizing loop |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56036286A JPS57150232A (en) | 1981-03-12 | 1981-03-12 | Phase synchronizing loop |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57150232A true JPS57150232A (en) | 1982-09-17 |
Family
ID=12465540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56036286A Pending JPS57150232A (en) | 1981-03-12 | 1981-03-12 | Phase synchronizing loop |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57150232A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5124839U (en) * | 1974-08-14 | 1976-02-24 | ||
JPS55664A (en) * | 1978-06-19 | 1980-01-07 | Toshiba Corp | Frequency synthesizer |
JPS5621422A (en) * | 1979-07-30 | 1981-02-27 | Int Standard Electric Corp | Phase locked loop type frequency synthesizer |
-
1981
- 1981-03-12 JP JP56036286A patent/JPS57150232A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5124839U (en) * | 1974-08-14 | 1976-02-24 | ||
JPS55664A (en) * | 1978-06-19 | 1980-01-07 | Toshiba Corp | Frequency synthesizer |
JPS5621422A (en) * | 1979-07-30 | 1981-02-27 | Int Standard Electric Corp | Phase locked loop type frequency synthesizer |
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