GB870922A - Improvements in or relating to delayed automatic gain control arrangements for transistor amplifier - Google Patents
Improvements in or relating to delayed automatic gain control arrangements for transistor amplifierInfo
- Publication number
- GB870922A GB870922A GB41684/59A GB4168459A GB870922A GB 870922 A GB870922 A GB 870922A GB 41684/59 A GB41684/59 A GB 41684/59A GB 4168459 A GB4168459 A GB 4168459A GB 870922 A GB870922 A GB 870922A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- gain control
- diode
- potential
- 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
- 230000003111 delayed effect Effects 0.000 title abstract 2
- 238000013016 damping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
-
- 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
-
- 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
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
870,922. Transistor amplifying and gain control circuits. TELEFUNKEN G.m.b.H. Dec. 8, 1959 [Dec. 15, 1958], No. 41684/59. Class 40(6) In a delayed automatic gain control (a.g.c. circuit, the gain controlling potential is fed to the transistor to be controlled via a diode connected for A.C. in parallel with part of the input tuned circuit of the transistor to compensate for the decrease in damping due to change in transistor input resistance with change in a.g.c. potential. The output from the intermediate frequency (i.f.) transformer Z 2 is detected and then amplified by transistor T 3 . Part of the average D.C. signal developed across the load of this transistor is fed back from the base circuit of i.f. amplifier T 1 through the diode D 2 which is effectively in parallel with the base circuit for A.C. signals. The level at which diode D 2 starts to conduct is determined by the potential dividers R 8 , R 9 and R 7 , and when conducting it applies a.g.c. volts to the base of T 1 , and also compensates for changes in input impedance of T 1 . The circuit may be arranged to provide over, under, or exact compensation. In a second embodiment Fig. 3 (not shown) the a.g.c. voltage is applied to control a radio frequency amplifier, from which a connection is taken from the emitter or collector over a resistor to control the gain of an i.f. stage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE870922X | 1958-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB870922A true GB870922A (en) | 1961-06-21 |
Family
ID=6809712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB41684/59A Expired GB870922A (en) | 1958-12-15 | 1959-12-08 | Improvements in or relating to delayed automatic gain control arrangements for transistor amplifier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB870922A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328714A (en) * | 1964-06-15 | 1967-06-27 | Philips Corp | Automatic gain control system for cascaded transistor amplifier |
| US3523254A (en) * | 1969-02-11 | 1970-08-04 | Ncr Co | Automatic gain control circuit employing a field-effect transistor |
-
1959
- 1959-12-08 GB GB41684/59A patent/GB870922A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328714A (en) * | 1964-06-15 | 1967-06-27 | Philips Corp | Automatic gain control system for cascaded transistor amplifier |
| US3523254A (en) * | 1969-02-11 | 1970-08-04 | Ncr Co | Automatic gain control circuit employing a field-effect transistor |
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