GB945420A - Circuit arrangement for effecting the automatic gain control of a single or multi-stage transistor amplifier - Google Patents
Circuit arrangement for effecting the automatic gain control of a single or multi-stage transistor amplifierInfo
- Publication number
- GB945420A GB945420A GB3318861A GB3318861A GB945420A GB 945420 A GB945420 A GB 945420A GB 3318861 A GB3318861 A GB 3318861A GB 3318861 A GB3318861 A GB 3318861A GB 945420 A GB945420 A GB 945420A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- base
- stages
- automatic gain
- filters
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000001419 dependent effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
- Amplifiers (AREA)
Abstract
945,420. Transistor automatic gain control circuits. STANDARD TELEPHONES & CABLES Ltd. Sept. 15, 1961 [Dot. 21, 1960], No. 33188/61. Heading H3T. A transistor radio receiver includes a grounded emitter stage 7 with a variable resistor 10 connected between the collector supply and the base for adjusting the D.C. working point, lowpass and high-pass filters connected in parallel between the receiver detector 4 and the base of the transistor 7, and a current dependent resistive network 12, 13, 14 shunted by a capacitor 11 in the transistor emitter circuit. Received signals are detected by the diode 4, and fed to the low-pass filter 6 which filters out the modulation to provide the a.g.c. signal, and also to the high-pass filter comprising a manual volume control potentiometer 8 and capacitor 9 which passes the modulation. The outputs from both filters are applied to the base of the transistor 7, the operating point of which may be adjusted by resistor 10. Amplified a.g.c. is taken from the emitter circuit across the non- linear network 12, 13, 14 and is fed to the front end stages 1, 2 which are to be controlled. In order that the stages 1, 2 may be biased to zero emitter current before the gain of amplifier 7 is reduced, the emitters of these stages are connected to a bias source 15.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEST17033A DE1175292B (en) | 1960-10-21 | 1960-10-21 | Circuit arrangement for the automatic gain control of a transistor radio receiver for amplitude-modulated waves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB945420A true GB945420A (en) | 1963-12-23 |
Family
ID=7457310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3318861A Expired GB945420A (en) | 1960-10-21 | 1961-09-15 | Circuit arrangement for effecting the automatic gain control of a single or multi-stage transistor amplifier |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1175292B (en) |
| GB (1) | GB945420A (en) |
-
1960
- 1960-10-21 DE DEST17033A patent/DE1175292B/en active Pending
-
1961
- 1961-09-15 GB GB3318861A patent/GB945420A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1175292B (en) | 1964-08-06 |
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