JPS5443666A - Variable frequency oscillator - Google Patents
Variable frequency oscillatorInfo
- Publication number
- JPS5443666A JPS5443666A JP11074477A JP11074477A JPS5443666A JP S5443666 A JPS5443666 A JP S5443666A JP 11074477 A JP11074477 A JP 11074477A JP 11074477 A JP11074477 A JP 11074477A JP S5443666 A JPS5443666 A JP S5443666A
- Authority
- JP
- Japan
- Prior art keywords
- gain
- variable
- variable frequency
- fixed
- division 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
- 230000035945 sensitivity Effects 0.000 abstract 3
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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To compensate the change of loop gain K accompanied with the change of division ratio N of a variable frequency divider and make gain K fixed by providing a variable gain controller between phase synchronizing loops of a phase synchronizing variable frequency oscillator and controlling the gain. CONSTITUTION:Variable gain controller 21 is provided between variable frequency divider 6 and phase detector 2. Controller 21 is a variable attenuator using, for example, a variable resistance type diode, and controls the DC bias of the diode to make attenuation variable. The VCO control voltage is relative to variable frequency division ratio N determined by digital switch 8. The VCO control voltage is branched to be supplied to variable gain controller 21; and when division ratio N becomes larger, the gain is increased; and when division ratio N becomes smaller, the gain is reduced. Since demodulation sensitivity Kd of the phase detector is proportional to the input signal level, the fixed synchronizing system of K is formed if Kd is so controlled that the ratio of N to demodulation sensitivity Kd of detector 2 may be fixed when demodulation sensitivity K0 of VCO and gain KA of loop amplifier 3 are fixed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11074477A JPS5443666A (en) | 1977-09-13 | 1977-09-13 | Variable frequency oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11074477A JPS5443666A (en) | 1977-09-13 | 1977-09-13 | Variable frequency oscillator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5443666A true JPS5443666A (en) | 1979-04-06 |
Family
ID=14543425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11074477A Pending JPS5443666A (en) | 1977-09-13 | 1977-09-13 | Variable frequency oscillator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5443666A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2511563A1 (en) * | 1981-08-14 | 1983-02-18 | Trt Telecom Radio Electr | PHASE LOCKING DEVICE FOR PROVIDING TO ITS OUTPUT SIGNALS WHOSE FREQUENCY CAN VARY OVER A WIDE RANGE |
US4392113A (en) * | 1981-02-12 | 1983-07-05 | Jackson Charles R | Phase-locked loop including non-linear phase detector of the sample and hold type |
JPS63135293U (en) * | 1987-02-27 | 1988-09-05 |
-
1977
- 1977-09-13 JP JP11074477A patent/JPS5443666A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4392113A (en) * | 1981-02-12 | 1983-07-05 | Jackson Charles R | Phase-locked loop including non-linear phase detector of the sample and hold type |
FR2511563A1 (en) * | 1981-08-14 | 1983-02-18 | Trt Telecom Radio Electr | PHASE LOCKING DEVICE FOR PROVIDING TO ITS OUTPUT SIGNALS WHOSE FREQUENCY CAN VARY OVER A WIDE RANGE |
JPS63135293U (en) * | 1987-02-27 | 1988-09-05 |
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