GB544175A - Improvements in negative feedback thermionic amplifiers - Google Patents
Improvements in negative feedback thermionic amplifiersInfo
- Publication number
- GB544175A GB544175A GB1287/41A GB128741A GB544175A GB 544175 A GB544175 A GB 544175A GB 1287/41 A GB1287/41 A GB 1287/41A GB 128741 A GB128741 A GB 128741A GB 544175 A GB544175 A GB 544175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- feedback
- resistances
- negative feedback
- arrangement
- 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
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
- H03F1/28—Modifications of amplifiers to reduce influence of noise generated by amplifying elements in discharge-tube amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/26—Push-pull amplifiers; Phase-splitters therefor
- H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/005—Reducing noise, e.g. humm, from the supply
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
544,175. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. Jan. 31, 1941, No. 1287. Convention date, Feb. 2, 1940. [Class40 (v)] In a negative feedback amplifier noise components arising from the power supply, which are normally increased due to the feedback connection, are reduced by means which impress the noise components on a grid of the amplifier in opposite phase. Fig. 3 shows a two-stage push-pull amplifier with negative feedback applied by resistances 39, 40 in which a condenser potentiometer 41, 43 applies. part of the noise voltage from the H.T. source to the grids of the output stage. In a modification, Fig. 4 (not shown) a positive feedback is applied through resistances connected between the output anodes and the centre tapping of the input transformer which is connected through a resistance to, earth. With this arrangement the voltages feedback cancel out in so. far as the push-pull stage is balanced and the residual noise voltage is in phase opposition to that introduced into the circuit by the negative feedback coupling. Fig. 5 shows an arrangement using two.. negative feedback paths from each output stage comprising resistances 116, 117 between plate and cathode and resistances 120, 121 cross connected between plate and grid. In a further modification, Fig. 6 (not shown) part of the noise voltage occurring In the anode supply is applied to the centre tap of the input transformer. With this arrangement low frequency voltages arising across the filter output condenser are also fed back thus preventing any tendency to low frequency oscillation due to these potentials. Fig. 7 shows an arrangement in which an inverter tube 244 is used to. feed one side of a push-pull output. In this arrangement, as shown, negative feedback is applied from each output anode to the cathode, and to the screen grid respectively of the input valve 241 through resistances 252, 255. Since the noise voltages in the two paths are in phase these may be arranged to balance one another in the output. Instability at high frequencies is avoided by providing condenser 271 between the anode of the inverter 244 and the anode of the input valve 241. The second feedback instead of being to the screen grid may be to the control grid. A resistance-capacity network 263, 264 may protect the output tubes from excessive transient voltages and the consequent loss at high frequencies may be compensated by reduced feedback at these frequencies by suitable choice of the condenser 259. The invention is also applicable to single side circuits. The Specification gives a mathematical analysis to show the conditions under which the hum voltage across the load is reduced to zero.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US316913A US2270295A (en) | 1940-02-02 | 1940-02-02 | Amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB544175A true GB544175A (en) | 1942-03-31 |
Family
ID=23231253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1287/41A Expired GB544175A (en) | 1940-02-02 | 1941-01-31 | Improvements in negative feedback thermionic amplifiers |
Country Status (6)
Country | Link |
---|---|
US (1) | US2270295A (en) |
BE (1) | BE442189A (en) |
CH (1) | CH272950A (en) |
FR (1) | FR884047A (en) |
GB (1) | GB544175A (en) |
NL (3) | NL57913C (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2583552A (en) * | 1944-04-29 | 1952-01-29 | Sperry Corp | Motor control circuit mixer |
US2714137A (en) * | 1944-10-12 | 1955-07-26 | George S Dzwons | Stabilized amplifier |
US2473423A (en) * | 1945-06-18 | 1949-06-14 | Submarine Signal Co | Antihunt electrical servo system |
NL74407C (en) * | 1947-11-18 | |||
US2751548A (en) * | 1951-09-06 | 1956-06-19 | Charles F Gunderson | Ripple compensator |
US2677015A (en) * | 1952-06-03 | 1954-04-27 | Us Navy | Frequency shift measuring circuit |
BE524267A (en) * | 1952-11-18 | |||
US2934715A (en) * | 1956-09-17 | 1960-04-26 | Marconi Wireless Telegraph Co | Grid bias control for class-b amplifier |
US3053934A (en) * | 1959-04-21 | 1962-09-11 | Erie Resistor Corp | Amplifier system for stereo sound |
US3324407A (en) * | 1964-06-29 | 1967-06-06 | Crosley Broadcasting Corp | Amplifier of the transformer-output type with regenerative feedback networks for reducing low frequency distortion |
-
0
- BE BE442189D patent/BE442189A/xx unknown
- NL NL115824D patent/NL115824B/xx unknown
- NL NL60229D patent/NL60229C/xx active
- NL NL57913D patent/NL57913C/xx active
-
1940
- 1940-02-02 US US316913A patent/US2270295A/en not_active Expired - Lifetime
-
1941
- 1941-01-31 GB GB1287/41A patent/GB544175A/en not_active Expired
- 1941-03-29 FR FR884047D patent/FR884047A/en not_active Expired
-
1942
- 1942-09-16 CH CH272950D patent/CH272950A/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL57913C (en) | |
CH272950A (en) | 1951-01-15 |
NL115824B (en) | |
FR884047A (en) | 1943-07-30 |
BE442189A (en) | |
NL60229C (en) | |
US2270295A (en) | 1942-01-20 |
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