GB884459A - Improvements in or relating to transistor amplifiers - Google Patents
Improvements in or relating to transistor amplifiersInfo
- Publication number
- GB884459A GB884459A GB995358A GB995358A GB884459A GB 884459 A GB884459 A GB 884459A GB 995358 A GB995358 A GB 995358A GB 995358 A GB995358 A GB 995358A GB 884459 A GB884459 A GB 884459A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- stage
- resistor
- going
- relating
- 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
- 230000007423 decrease Effects 0.000 abstract 2
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
- Amplifiers (AREA)
Abstract
884,459. Transistor amplifier circuits. TELEFUNKEN G.m.b.H. March 28, 1958, No. 9953/58. Class 40(6). In a multistage transistor amplifier gain control voltages are applied to adjacent stages in opposite polarity. As applied to a twostage I.F. amplifier, a negative-going A.G.C. voltage is applied from the detector C to the base of the first stage A and causes the voltage across the resistor 10 in the collector circuit to be positive-going. This voltage is applied to the base of the second stage B via resistor 9, so that as the output impedance of stage A increases that of B decreases, the desired decrease of gain being produced by impedance mismatch between the stages. A preceding stage may be controlled by the voltage across resistor 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB995358A GB884459A (en) | 1958-03-28 | 1958-03-28 | Improvements in or relating to transistor amplifiers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB995358A GB884459A (en) | 1958-03-28 | 1958-03-28 | Improvements in or relating to transistor amplifiers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB884459A true GB884459A (en) | 1961-12-13 |
Family
ID=9881810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB995358A Expired GB884459A (en) | 1958-03-28 | 1958-03-28 | Improvements in or relating to transistor amplifiers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB884459A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2227621A (en) * | 1988-12-22 | 1990-08-01 | Hitachi Ltd | Gain control for two stage, Si/GaAs, amplifier |
-
1958
- 1958-03-28 GB GB995358A patent/GB884459A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2227621A (en) * | 1988-12-22 | 1990-08-01 | Hitachi Ltd | Gain control for two stage, Si/GaAs, amplifier |
US5029298A (en) * | 1988-12-22 | 1991-07-02 | Hitachi, Ltd. | Transmitter circuit |
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