GB1049853A - Improvements in or relating to oscillation generators - Google Patents
Improvements in or relating to oscillation generatorsInfo
- Publication number
- GB1049853A GB1049853A GB2289862A GB2289862A GB1049853A GB 1049853 A GB1049853 A GB 1049853A GB 2289862 A GB2289862 A GB 2289862A GB 2289862 A GB2289862 A GB 2289862A GB 1049853 A GB1049853 A GB 1049853A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- capacitor
- pulse
- line
- error
- 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.)
- Expired
Links
- 230000010355 oscillation Effects 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 abstract 8
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
- H03L7/187—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 using means for coarse tuning the voltage controlled oscillator of the loop
-
- 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
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/087—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using at least two phase detectors or a frequency and phase detector in the loop
-
- 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
- H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/06—Phase locked loops with a controlled oscillator having at least two frequency control terminals
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
1,049,853. Variable frequency oscillation. PLESSEY CO. Ltd. Sept. 12, 1963 [June 14, 1962], No. 22898/62. Heading H3A. In a variable frequency oscillation generator including an A.F.C. system, of the type described in Specification 1,024,427, in which a coarse frequency control arrangement including means for altering the reactance presented by a switchable reactor unit to the oscillator frequency determining circuit, and a fine frequency control including a phase comparator, are provided, the coarse control is modified to include a switchable series of capacitors having values proportioned to the power series of 2. The circuit up to the output from gates 14, 15 is identical to that described in Specification 1,024,427 and provides on line 16 a number of pulses proportional to the difference in frequency between the reference pulses derived from the fixed divider 2 and those derived from the controlled oscillator via variable divider 6. A signal is also provided on line 26 indicative of the sign of the error. The pulses on line 16 are applied to a 12-stage stepping register 23 and the first pulse to arrive operates the first stage of the register which provides an output pulse to switch bi-stable circuit 24(1) to a state in which it opens transistor gate 21(1) and connects capacitor 20(1) in the oscillator frequency determining circuit. If on arrival of the second pulse the error is in the same direction capacitor 20(1) remains in circuit and the second pulse switches capacitor 20(2) into the circuit, however if after the addition of capacitor 20(1) the sense of the error changes the signal on line 26 changes and opens the gates 25 whereby the second pulse in addition to switching capacitor 20(2) into circuit also switches bi-stable circuit 24(1) back to its initial state and removes capacitor 20(1) from the circuit. The capacitors 20(1) &c. have values proportional to a descending power series of 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2289862A GB1049853A (en) | 1962-06-14 | 1962-06-14 | Improvements in or relating to oscillation generators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2289862A GB1049853A (en) | 1962-06-14 | 1962-06-14 | Improvements in or relating to oscillation generators |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1049853A true GB1049853A (en) | 1966-11-30 |
Family
ID=10186845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2289862A Expired GB1049853A (en) | 1962-06-14 | 1962-06-14 | Improvements in or relating to oscillation generators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1049853A (en) |
-
1962
- 1962-06-14 GB GB2289862A patent/GB1049853A/en not_active Expired
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