GB1027621A - Improvements in and relating to electrical null networks - Google Patents
Improvements in and relating to electrical null networksInfo
- Publication number
- GB1027621A GB1027621A GB54661A GB54661A GB1027621A GB 1027621 A GB1027621 A GB 1027621A GB 54661 A GB54661 A GB 54661A GB 54661 A GB54661 A GB 54661A GB 1027621 A GB1027621 A GB 1027621A
- Authority
- GB
- United Kingdom
- Prior art keywords
- null
- amplifier
- frequency
- network
- feedback path
- 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 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
1,027,621. Impedance networks; oscillating circuits; frequency-selective amplifying circuits. WALLACE, DAVIDSON & PARTNER, and J. DAVIDSON. April 5, 1962 [Jan. 5, 1961], No. 546/61. Headings H3F, H3U and H3W. An amplifier comprises a null network embodied in a negative feedback path, one or more of the channels of the null network being associated with variable attenuators whereby the null frequency and hence the frequency of operation of the amplifier may be varied. The amplifier may also have a positive feedback path whereby oscillations can be generated. As shown, the negative feedback path of amplifier A comprises a twin-T network 12, 13, 14, 15, 16, 17 the null frequency of which is varied by means of the differential attenuator 23, 23<SP>1</SP>, 24, 24<SP>1</SP>. Two separate attenuators or a single attenuator in one path. Other forms of null network using e.g. bridge- T or resonant circuits may be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54661A GB1027621A (en) | 1961-01-05 | 1961-01-05 | Improvements in and relating to electrical null networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54661A GB1027621A (en) | 1961-01-05 | 1961-01-05 | Improvements in and relating to electrical null networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1027621A true GB1027621A (en) | 1966-04-27 |
Family
ID=9706267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB54661A Expired GB1027621A (en) | 1961-01-05 | 1961-01-05 | Improvements in and relating to electrical null networks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1027621A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0034064A2 (en) * | 1980-02-11 | 1981-08-19 | Decca Limited | Adjustable and selective electrical filters and methods of tuning them |
-
1961
- 1961-01-05 GB GB54661A patent/GB1027621A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0034064A2 (en) * | 1980-02-11 | 1981-08-19 | Decca Limited | Adjustable and selective electrical filters and methods of tuning them |
| EP0034064A3 (en) * | 1980-02-11 | 1981-12-30 | Decca Limited | Adjustable and selective electrical filters and methods of tuning them |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB659063A (en) | Improvements in or relating to loudspeakers | |
| ES295716A1 (en) | Adjustable input impedance amplifier | |
| GB1027621A (en) | Improvements in and relating to electrical null networks | |
| GB577168A (en) | Improvements in or relating to electron discharge devices employing velocity modulation | |
| JPS5323254A (en) | Amplifier equipment | |
| GB966326A (en) | Improvements relating to active electrical one-ports | |
| GB709902A (en) | Improvements in conductor devices having a variable electric resistance | |
| GB682010A (en) | An improved hollow building brick or block | |
| GB1219933A (en) | Improvements in or relating to electric filter circuits | |
| GB611391A (en) | Thermionic valve amplifier circuit with multiple feedback | |
| GB542000A (en) | Improvements in and relating to electric wave transmission devices | |
| GB791372A (en) | Improvements in or relating to magnetostatic relays | |
| GB516697A (en) | Improvements in or relating to wave amplifying systems | |
| GB748204A (en) | Improvements in transistor integrating circuits | |
| ES8204893A1 (en) | Amplifier arrangement with very low distortion | |
| GB562392A (en) | Improvements in or relating to negative feedback amplifiers | |
| GB892426A (en) | Improvements in or relating to negative feedback amplifier arrangements | |
| JPS52149415A (en) | Bidirectional amplifier | |
| GB1036985A (en) | Amplifier terminating network | |
| GB702359A (en) | Improvements relating to non-linear electrical circuits | |
| GB645011A (en) | Improvements in and relating to electric impedance networks | |
| GB1211776A (en) | An arrangement for varying the feedback of an amplifier | |
| GB962431A (en) | Negative feedback amplifier | |
| GB1116354A (en) | Improvements in or relating to impedance transforming networks | |
| GB506765A (en) | Improvements in or relating to amplifiers for electrical signalling systems |