GB807815A - Transistorised amplifier with automatic gain control - Google Patents
Transistorised amplifier with automatic gain controlInfo
- Publication number
- GB807815A GB807815A GB18245/57A GB1824557A GB807815A GB 807815 A GB807815 A GB 807815A GB 18245/57 A GB18245/57 A GB 18245/57A GB 1824557 A GB1824557 A GB 1824557A GB 807815 A GB807815 A GB 807815A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- circuit
- control
- output
- 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
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
807,815. Transistor amplifiers. STANDARD TELEPHONES & CABLES Ltd. June 7, 1957 [June 13, 1956], No. 18245/57. Class 40 (6). Automatic gain control in a multistage transistor amplifier is effected by deriving a control signal from the output of the amplifier and using it to control the effective resistance in series with the emitter electrode of the input transistor in such a manner as to maintain the output of the amplifier substantially constant. The transistors used may be of either the junction or point-contact type. In Fig. 1 a unidirectional control current derived by rectifiers 40 at the output of the amplifier is applied to a circuit comprising diode 30 to vary the impedance reflected by the diodes 30 through the transformer T2 in series with the emitter electrode of the first-stage transistor. Fig. 2 shows a modified circuit in which the control circuit is used to vary the resistance of a directlyheated thermistor 50 having a positive temperature coefficient. The circuit may be modified to employ a thermistor with a negative temperature coefficient by returning the thermistor to a point of suitable bias potential. In Fig. 3 the output signal of the amplifier is used directly (i.e. without rectification) to control the resistances of thermistors 50<1> coupled through transformer T2 into a series circuit with the emitter electrode of the input transistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US807815XA | 1956-06-13 | 1956-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB807815A true GB807815A (en) | 1959-01-21 |
Family
ID=22159579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18245/57A Expired GB807815A (en) | 1956-06-13 | 1957-06-07 | Transistorised amplifier with automatic gain control |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB807815A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3139536A (en) * | 1961-11-29 | 1964-06-30 | Bell Telephone Labor Inc | Low level transistor gating circuit |
| DE1235382B (en) * | 1959-09-07 | 1967-03-02 | Richard Guenther Dipl Ing | Circuit arrangement for amplitude control for oscillators |
| US3327236A (en) * | 1964-07-13 | 1967-06-20 | Burroughs Corp | Gain setting switching circuit responsive to automatically emitted digital levels |
-
1957
- 1957-06-07 GB GB18245/57A patent/GB807815A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1235382B (en) * | 1959-09-07 | 1967-03-02 | Richard Guenther Dipl Ing | Circuit arrangement for amplitude control for oscillators |
| US3139536A (en) * | 1961-11-29 | 1964-06-30 | Bell Telephone Labor Inc | Low level transistor gating circuit |
| US3327236A (en) * | 1964-07-13 | 1967-06-20 | Burroughs Corp | Gain setting switching circuit responsive to automatically emitted digital levels |
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