GB846131A - Automatic gain controls for radios - Google Patents
Automatic gain controls for radiosInfo
- Publication number
- GB846131A GB846131A GB14362/57A GB1436257A GB846131A GB 846131 A GB846131 A GB 846131A GB 14362/57 A GB14362/57 A GB 14362/57A GB 1436257 A GB1436257 A GB 1436257A GB 846131 A GB846131 A GB 846131A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- transistor
- circuit
- bias
- resistor
- 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
- 239000004065 semiconductor Substances 0.000 abstract 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 238000013016 damping Methods 0.000 abstract 1
- 229910052732 germanium Inorganic materials 0.000 abstract 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 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
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
Landscapes
- Amplifiers (AREA)
Abstract
846,131. Semi-conductor radio receiving circuits. TEXAS INSTRUMENTS Inc. May 6, 1957 [May 15, 1956], No. 14362/57. Class 40(6). The radio-frequency input stage of a transistor receiver comprises a parallel-tuned circuit, part, at least, of which is connected in parallel with a semiconductor diode so that when large-amplitude signals are received, the resistance of the diode falls to increase the damping of the tuned circuit and reduce overloading of the first stage of the receiver. In the arrangement shown, the diode 19 is connected in series with variable resistor 20 and emitter-bias resistor 17 across the tuned circuit 12, 13, 14. The diode is so poled that in addition to increasing the load on the circuit for large-amplitude signals it produces a positive bias to reduce the gain of the transistor 16. The shunting effect of the diode may be adjusted to a desired value -by variation of the resistor 20. The diode 19 may be composed of any suitable semi-conductor material; some advantage may be gained by the use of silicon diodes which do not become effective until voltage input levels which are higher than those required for germanium diodes are reached. In modified forms of circuit, Figs. 2 and 3 -(not shown), the diode exercises a shunting effect only and does not provide a bias for the emitter of the transistor. In a further modification, Fig. 4 (not shown) a double-base grown-junction type transistor is used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US846131XA | 1956-05-15 | 1956-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB846131A true GB846131A (en) | 1960-08-24 |
Family
ID=22186091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14362/57A Expired GB846131A (en) | 1956-05-15 | 1957-05-06 | Automatic gain controls for radios |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB846131A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3199029A (en) * | 1961-05-03 | 1965-08-03 | Bendix Corp | Automatic gain control system |
| US3792359A (en) * | 1971-04-14 | 1974-02-12 | Rca Corp | High frequency automatic gain control circuits |
-
1957
- 1957-05-06 GB GB14362/57A patent/GB846131A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3199029A (en) * | 1961-05-03 | 1965-08-03 | Bendix Corp | Automatic gain control system |
| US3792359A (en) * | 1971-04-14 | 1974-02-12 | Rca Corp | High frequency automatic gain control circuits |
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