GB974065A - Improvements in amplifier circuits - Google Patents
Improvements in amplifier circuitsInfo
- Publication number
- GB974065A GB974065A GB27836/62A GB2783662A GB974065A GB 974065 A GB974065 A GB 974065A GB 27836/62 A GB27836/62 A GB 27836/62A GB 2783662 A GB2783662 A GB 2783662A GB 974065 A GB974065 A GB 974065A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- output
- gain
- voltage
- collector
- 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
- 230000002596 correlated effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000004804 winding Methods 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
-
- 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
-
- 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
- H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
-
- 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
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
974,065. Transistor amplifying circuits. COMPAGNIE FRANCAISE THOMSONHOUSTON. July 19, 1962 [July 21, 1961], No. 27836/62. Heading H3T. In an amplifier including a transistor from which an output is obtained across a pair of its electrodes, the gain is controlled by varying the current flow between, and the voltage drop across the pair of electrodes, the variations being so correlated as to maintain the input and output impedances of the transistor substantially constant with changes in gain. As described, Fig. 4, an amplifier comprises three similar stages each supplied with a gaincontrol voltage, which may be automatic gain control, from a source P. Stage 1, for example, comprises a common emitter transistor T1 having an inductive load L11 which includes a winding n1 connected in a stabilizing feed-back path to the base. The control source P has a first output A connected to vary the base potential, and hence the collector current, of T1 and a second output B connected to the collector via resistor R14 to vary the collector potential. By adjusting the values of R41, R42 the ratio of the voltage at A to that at B may be arranged so that variation of gain of the transistor T1 is achieved without substantial variation in input and output impedances of the transistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR868631A FR1302631A (en) | 1961-07-21 | 1961-07-21 | Improvements to amplifier circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB974065A true GB974065A (en) | 1964-11-04 |
Family
ID=8759786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27836/62A Expired GB974065A (en) | 1961-07-21 | 1962-07-19 | Improvements in amplifier circuits |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE1154519B (en) |
| ES (1) | ES279238A1 (en) |
| FR (1) | FR1302631A (en) |
| GB (1) | GB974065A (en) |
| OA (1) | OA00183A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1295618B (en) * | 1963-04-27 | 1969-05-22 | Philips Patentverwaltung | Circuit arrangement for controlling the amplification of series-connected transistor amplifier stages in a television receiver |
| DE1299331B (en) * | 1966-01-10 | 1969-07-17 | Siemens Ag | Transistor amplifier with adjustable amplification factor and with a constant transmission curve over the entire control range |
| DE3276515D1 (en) * | 1982-06-22 | 1987-07-09 | Telefongyar | Frequency selective amplifier with gain control |
-
1961
- 1961-07-21 FR FR868631A patent/FR1302631A/en not_active Expired
-
1962
- 1962-07-14 ES ES0279238A patent/ES279238A1/en not_active Expired
- 1962-07-19 GB GB27836/62A patent/GB974065A/en not_active Expired
- 1962-07-20 DE DE1962C0027519 patent/DE1154519B/en active Pending
-
1964
- 1964-07-30 OA OA50228A patent/OA00183A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES279238A1 (en) | 1963-01-01 |
| DE1154519B (en) | 1963-09-19 |
| OA00183A (en) | 1966-03-15 |
| FR1302631A (en) | 1962-08-31 |
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