GB634088A - Improvements in negative feed-back amplifiers - Google Patents
Improvements in negative feed-back amplifiersInfo
- Publication number
- GB634088A GB634088A GB18750/46A GB1875046A GB634088A GB 634088 A GB634088 A GB 634088A GB 18750/46 A GB18750/46 A GB 18750/46A GB 1875046 A GB1875046 A GB 1875046A GB 634088 A GB634088 A GB 634088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- amplifier
- grid
- control valve
- cathode
- 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
- 230000004048 modification Effects 0.000 abstract 3
- 238000012986 modification Methods 0.000 abstract 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000013642 negative control Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
- H03G3/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
634,088. Valve amplifying circuits. SADIRCARPENTIER. June 21, 1946, No. 18750. Convention date, June 21, 1945. [Class 40 (vi)] The negative feedback applied to an amplifier across an impedance is controlled by a D.C. voltage applied to a valve whose anode-cathode resistance shunts the impedance. In one embodiment, Fig. 3, the cathode resistance 5 of an amplifier valve 1 is shunted by a control valve 8 with its cathode connected to the cathode of valve 1. The amount of negative feedback applied to the amplifier valve 1 from a following stage 2 is varied by a negative control voltage applied to the grid of valve 8. In a modification, Fig. 4 (not shown), part of the output of the following stage 2 is applied to the grid of the control valve. The feedback to the amplifier 1 varies according to the phase and magnitude of the energy applied to the grid of the control valve, and may become positive. In a further modification, Fig. 6 (not shown), the cathode resistance of the amplifier valve is shunted by a parallel tuned circuit, and a fraction of the output of the following stage is fed to the grid of the control valve through a filter network. This enables the response of the amplifier to be reduced round the resonant frequency of the tuned circuit, and to be increased by an amount depending on the control voltage for frequencies within the pass band of the filter. In another embodiment, Fig. 5, the anode of the control valve 8 is connected to the cathode of the amplifier valve 1 through a blocking condenser 12. A portion of the output of the following stage 2 is fed to the grid of valve 8 through a potentiometer 13, 14. In a modification, Fig. 7 (not shown), part of the input to the amplifier is fed to the grid of the control valve, so that the amount of negative feedback is reduced for frequencies contained in the input, and the gain is reduced for unwanted frequencies. The amplifier may form part of a receiver, when the automatic volume control voltage may be applied to the control valve.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR634088X | 1945-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB634088A true GB634088A (en) | 1950-03-15 |
Family
ID=8993345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18750/46A Expired GB634088A (en) | 1945-06-21 | 1946-06-21 | Improvements in negative feed-back amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB634088A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE973734C (en) * | 1952-05-02 | 1960-05-25 | Foxboro Co | Amplifier for a fluid meter |
-
1946
- 1946-06-21 GB GB18750/46A patent/GB634088A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE973734C (en) * | 1952-05-02 | 1960-05-25 | Foxboro Co | Amplifier for a fluid meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB634088A (en) | Improvements in negative feed-back amplifiers | |
| GB615987A (en) | Improvements in or relating to circuits for amplifying electrical oscillations | |
| GB645955A (en) | Improvements in electronic amplifiers | |
| GB624010A (en) | Improvements in radio-receivers with low-frequency negative feedback and amplification control | |
| GB611564A (en) | Improvements in or relating to radio and like receivers | |
| GB611391A (en) | Thermionic valve amplifier circuit with multiple feedback | |
| GB721550A (en) | Improvements in or relating to gain control circuit arrangements | |
| GB617630A (en) | Improvements in or relating to thermionic valve wave translating circuits | |
| GB658833A (en) | Improvements relating to negative feedback amplifiers | |
| US2768288A (en) | Frequency-demodulation circuit | |
| US2920282A (en) | Electrical signal power amplifier | |
| GB626595A (en) | Improvements in or relating to frequency modulation systems | |
| US2510640A (en) | Stabilized high-frequency amplifier | |
| GB628553A (en) | Improvements in or relating to thermionic valve generators | |
| GB619523A (en) | Improvements in or relating to amplitude-control circuits for electronic amplifiers | |
| GB623746A (en) | Improvements in or relating to electronic tube amplifiers | |
| GB638823A (en) | Improvements in or relating to thermionic valve amplifiers | |
| GB669717A (en) | Improvements in and relating to frequency modulation circuits | |
| GB640267A (en) | Improved signal-translating stage for radio signalling | |
| GB680568A (en) | A tone control arrangement for a low frequency signal amplifier | |
| GB635228A (en) | Radio receiver tone control | |
| GB576277A (en) | Improvements in or relating to electron discharge valve amplifiers | |
| GB637549A (en) | Improvements in tone control arrangements for audio frequency amplifiers | |
| GB842132A (en) | Improvements in or relating to electric amplifier arrangements | |
| GB668232A (en) | Improvements in or relating to thermionic valve oscillators and selective amplifiers |