GB654758A - Improvements in or relating to electrical oscillation generators - Google Patents
Improvements in or relating to electrical oscillation generatorsInfo
- Publication number
- GB654758A GB654758A GB2964548A GB2964548A GB654758A GB 654758 A GB654758 A GB 654758A GB 2964548 A GB2964548 A GB 2964548A GB 2964548 A GB2964548 A GB 2964548A GB 654758 A GB654758 A GB 654758A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- amplitude
- output
- oscillations
- oscillator
- 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 8
- 230000003321 amplification Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L5/00—Automatic control of voltage, current, or power
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
654,758. Automatic frequency control systems. GENERAL ELECTRIC CO., Ltd., and MUNNS, J. G. W. Nov. 15, 1948, No. 29645. [Class 38 (iv)] [Also in Group XL (c)] An ultra-high-frequency oscillation generator comprises a first high-frequency generator, the output of which is mixed with a second source of oscillations of substantially lower frequency, the sum or difference frequency being selected and detected to provide an electric signal proportional to the amplitude, which is applied in a feed-back path to vary the amplitude of the second oscillations so as to maintain the amplitude of the sum or difference oscillations constant. The invention is suitable for use with ultra-high-frequency generators in which it is difficult to apply amplitude control directly. In Fig. 1, the output from an oscillator 1 having a frequency of approximately 1000 megacycles, is mixed in frequency-changing device 4 with the output from an oscillator 2 operating at approximately thirty megacycles. The sum or difference frequency is selected and applied to the output point 5 after amplification in amplifier 7. The output is also applied to a detector 6 which supplies a control voltage proportional to the amplitude, which is used to control the amplitude of the oscillations from oscillator 2 either directly or by varying the gain of amplifier 3, so that the amplitude of the oscillations at point 5 is maintained constant. In an alternative arrangement, the lower frequency oscillations before being applied to amplifier 3, are obtained from the difference frequency resulting from mixing the output from oscillator 1 with that from a crystal-controlled oscillator the output of which includes a high order harmonic content, so that the difference frequency is relatively low, and of the same order as that from oscillator 2 in Fig. 1. The control voltage in this case is used to vary the gain of the amplifier 3. An automatic frequency-control arrangement may also be associated with the circuit described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2964548A GB654758A (en) | 1948-11-15 | 1948-11-15 | Improvements in or relating to electrical oscillation generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2964548A GB654758A (en) | 1948-11-15 | 1948-11-15 | Improvements in or relating to electrical oscillation generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB654758A true GB654758A (en) | 1951-06-27 |
Family
ID=10294833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2964548A Expired GB654758A (en) | 1948-11-15 | 1948-11-15 | Improvements in or relating to electrical oscillation generators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB654758A (en) |
-
1948
- 1948-11-15 GB GB2964548A patent/GB654758A/en not_active Expired
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