GB1036727A - Improvements in or relating to variable-gain circuits - Google Patents
Improvements in or relating to variable-gain circuitsInfo
- Publication number
- GB1036727A GB1036727A GB1790262A GB1790262A GB1036727A GB 1036727 A GB1036727 A GB 1036727A GB 1790262 A GB1790262 A GB 1790262A GB 1790262 A GB1790262 A GB 1790262A GB 1036727 A GB1036727 A GB 1036727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- variable
- relating
- base current
- 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
- H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
1,036,727. Transistor amplifier and reactance circuits. PLESSEY CO. Ltd. May 9, 1963 [May 9, 1962], No. 17902/62. Headings H3R and H3T. The gain of a transistor amplifying circuit is adjustable by variation of the base current of an auxiliary transistor 31 connected across the collector or emitter load of the amplifying circuit 30 and operated without any D.C. emittercollector voltage. For signals of small amplitude, the impedance of transistor 31 is linear and dependent on the magnitude of the base current. In the circuit shown, a transistor 30 forms part of a variable reactance circuit used to adjust the frequency of an oscillator 20. In Fig. 2 (not shown), the controlling transistor 31 and a blocking capacitor are connected across the emitter-collector path of a voltage amplifying transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1790262A GB1036727A (en) | 1962-05-09 | 1962-05-09 | Improvements in or relating to variable-gain circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1790262A GB1036727A (en) | 1962-05-09 | 1962-05-09 | Improvements in or relating to variable-gain circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1036727A true GB1036727A (en) | 1966-07-20 |
Family
ID=10103254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1790262A Expired GB1036727A (en) | 1962-05-09 | 1962-05-09 | Improvements in or relating to variable-gain circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1036727A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2481539A1 (en) * | 1980-04-23 | 1981-10-30 | Rca Corp | REGULATED GAIN AMPLIFIER WITH VARIABLE LOAD IMPEDANCE |
| US4471324A (en) * | 1982-01-19 | 1984-09-11 | Dbx, Inc. | All NPN variably controlled amplifier |
-
1962
- 1962-05-09 GB GB1790262A patent/GB1036727A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2481539A1 (en) * | 1980-04-23 | 1981-10-30 | Rca Corp | REGULATED GAIN AMPLIFIER WITH VARIABLE LOAD IMPEDANCE |
| US4471324A (en) * | 1982-01-19 | 1984-09-11 | Dbx, Inc. | All NPN variably controlled amplifier |
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