GB1073675A - Improvements in or relating to selection arrangements for selecting a control oscillation in a frequency range - Google Patents
Improvements in or relating to selection arrangements for selecting a control oscillation in a frequency rangeInfo
- Publication number
- GB1073675A GB1073675A GB329466A GB329466A GB1073675A GB 1073675 A GB1073675 A GB 1073675A GB 329466 A GB329466 A GB 329466A GB 329466 A GB329466 A GB 329466A GB 1073675 A GB1073675 A GB 1073675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- frequency
- output
- range
- control
- 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 6
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000003071 parasitic effect Effects 0.000 abstract 2
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
- H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
1,073,675. Automatic frequency control systems. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Jan. 25, 1966 [Jan. 28, 1965], No. 3294/66. Heading,.H3A. An automatic frequency control system adapted to select a control oscillation in a particular frequency range in the presence of parasitic interference oscillations, comprises a local oscillator (24) an output of which is mixed with the control oscillation (supplied to terminals 1) in an amplitude-sensitive phase discriminator the output of which is fed through a low-pass filter (18-20) to a frequency-correcting arrangement (30) connected to the oscillator, the natural frequency of the oscillator being outside the frequency range and a sweep oscillator being provided to sweep the oscillator through the range until it locks on. Since the natural frequency of the oscillator is outside the range, a large output from the discriminator is necessary to lock the oscillator; the required control oscillation is capable of producing this output, but a parasitic oscillation (e.g. a sideband frequency) will not have sufficient amplitude. The sweep oscillator comprises a multi. vibrator (45, 46) the output of which is differentiated (capacitor 49) and causes a capacitor (19) in the low-pass filter to charge to the negative supply potential; the discharge of this capacitor sweeps the oscillator (24) through the range. When the phase discriminator produces an output sufficient to hold the oscillator at the control frequency, the multivibrator is disabled by an amplitude discriminator circuit (33-42) fed from the phase discriminator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6501039A NL6501039A (en) | 1965-01-28 | 1965-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1073675A true GB1073675A (en) | 1967-06-28 |
Family
ID=19792198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB329466A Expired GB1073675A (en) | 1965-01-28 | 1966-01-25 | Improvements in or relating to selection arrangements for selecting a control oscillation in a frequency range |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE675606A (en) |
| DE (1) | DE1491972C3 (en) |
| DK (1) | DK113932B (en) |
| GB (1) | GB1073675A (en) |
| NL (1) | NL6501039A (en) |
| SE (1) | SE314420B (en) |
-
1965
- 1965-01-28 NL NL6501039A patent/NL6501039A/xx unknown
-
1966
- 1966-01-25 GB GB329466A patent/GB1073675A/en not_active Expired
- 1966-01-25 DE DE19661491972 patent/DE1491972C3/en not_active Expired
- 1966-01-25 SE SE95366A patent/SE314420B/xx unknown
- 1966-01-25 DK DK39266A patent/DK113932B/en unknown
- 1966-01-26 BE BE675606D patent/BE675606A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK113932B (en) | 1969-05-12 |
| DE1491972C3 (en) | 1974-03-28 |
| NL6501039A (en) | 1966-07-29 |
| SE314420B (en) | 1969-09-08 |
| BE675606A (en) | 1966-07-26 |
| DE1491972B2 (en) | 1973-09-06 |
| DE1491972A1 (en) | 1969-10-09 |
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