GB868995A - Improvements in and relating to frequency-changing circuits - Google Patents
Improvements in and relating to frequency-changing circuitsInfo
- Publication number
- GB868995A GB868995A GB4169957A GB4169957A GB868995A GB 868995 A GB868995 A GB 868995A GB 4169957 A GB4169957 A GB 4169957A GB 4169957 A GB4169957 A GB 4169957A GB 868995 A GB868995 A GB 868995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- diodes
- oscillator
- mixer
- transistor
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/12—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes
Abstract
868,995. Frequency changing circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Jan. 20, 1960 [Dec. 24, 1958], No. 41699/58. Class 40(6) In a frequency changing circuit for a radio. receiver the local oscillator 10 operates at one half the beat frequency, its tuned circuit 11 being earthed at a centre-tap and having symmetrical tappings which feed a frequency doubler compromising crystal diodes 14, 15. The diodes feed directly into the mixer, without the interposition of filter circuits tuned to the second harmonic of the oscillator frequency. The mixer may comprise a thermionic valve or, as shown a transistor 21, the signal being applied to its base and the local oscillations injected into the emitter: the diodes 14, 15 are so poled as to provide a conductive path for the transistor emitter current. The arrangement may also be applied to arrangements in which a higher harmonic of the oscillator frequency is used, e.g. by using two frequency doublers in cascade to provide a quadrupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4169957A GB868995A (en) | 1958-12-24 | 1958-12-24 | Improvements in and relating to frequency-changing circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4169957A GB868995A (en) | 1958-12-24 | 1958-12-24 | Improvements in and relating to frequency-changing circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB868995A true GB868995A (en) | 1961-05-25 |
Family
ID=10420944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4169957A Expired GB868995A (en) | 1958-12-24 | 1958-12-24 | Improvements in and relating to frequency-changing circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB868995A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5379457A (en) * | 1993-06-28 | 1995-01-03 | Hewlett-Packard Company | Low noise active mixer |
| US6317590B1 (en) | 1997-12-23 | 2001-11-13 | Nokia Mobile Phones, Ltd. | Mixer for a receiver |
-
1958
- 1958-12-24 GB GB4169957A patent/GB868995A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5379457A (en) * | 1993-06-28 | 1995-01-03 | Hewlett-Packard Company | Low noise active mixer |
| GB2279527A (en) * | 1993-06-28 | 1995-01-04 | Hewlett Packard Co | Low noise active mixer |
| GB2279527B (en) * | 1993-06-28 | 1998-05-27 | Hewlett Packard Co | Low noise active mixer |
| US6317590B1 (en) | 1997-12-23 | 2001-11-13 | Nokia Mobile Phones, Ltd. | Mixer for a receiver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1124266A (en) | Modular integrated electronics radar | |
| GB1121439A (en) | Electronic tunable oscillator circuit | |
| GB868995A (en) | Improvements in and relating to frequency-changing circuits | |
| GB855985A (en) | Improvements in or relating to transistor oscillation generators | |
| GB785538A (en) | Improvements in or relating to transistor circuits | |
| GB990442A (en) | Improvements in or relating to wideband frequency modulation systems | |
| GB1109637A (en) | Improvements in or relating to transistor mixing circuit arrangements | |
| GB915162A (en) | Improvements in pulse generators | |
| GB983657A (en) | Improvements in or relating to variable frequency oscillators | |
| GB1292560A (en) | Controllable reactance circuit | |
| GB1082905A (en) | Improvements in or relating to semi-conductor diodes | |
| GB877108A (en) | Improvements in or relating to self oscillating mixing circuits | |
| GB805323A (en) | Channel selectors for signal-seeking receivers | |
| GB802104A (en) | Improvements relating to transistor oscillator circuits | |
| GB783238A (en) | Improvements in or relating to transistor mixing circuit-arrangements | |
| GB817319A (en) | Stabilised electric transistor oscillators | |
| GB894979A (en) | Frequency converter | |
| GB1104928A (en) | Improvements in electronic mixer and frequency changer circuits | |
| GB761802A (en) | Improvements in or relating to electric oscillator circuits employing transistors | |
| GB897561A (en) | Improvements in or relating to receiver circuit arrangements | |
| GB1144459A (en) | Crystal-controlled radio frequency generators | |
| GB725646A (en) | Improvements relating to frequency converters for radio frequencies | |
| GB1392876A (en) | Method and device for generating electrical oscillations | |
| GB670363A (en) | Improvements in and relating to frequency divider circuits | |
| GB1022308A (en) | Crystal oscillator circuit |