GB1155772A - Improvements in Multistage Transistor Amplifiers - Google Patents
Improvements in Multistage Transistor AmplifiersInfo
- Publication number
- GB1155772A GB1155772A GB2588167A GB2588167A GB1155772A GB 1155772 A GB1155772 A GB 1155772A GB 2588167 A GB2588167 A GB 2588167A GB 2588167 A GB2588167 A GB 2588167A GB 1155772 A GB1155772 A GB 1155772A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- resistors
- gain control
- automatic gain
- stage
- 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
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000010363 phase shift Effects 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
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
- Amplifiers (AREA)
Abstract
1,155,772. Automatic gain control in transistor circuits. DECCA Ltd. 14 May, 1968 [5 June, 1967], No. 25881/67. Heading H3T. In a multi-stage transistor amplifier which is resistance/capacitance coupled between stages and in which means are provided to vary in accordance with an automatic gain control signal the energization of a supply line 12 to which biasing resistors of each stage are connected, the arrangement is such that low frequency variations of the automatic gain control signal are communicated substantially equally to both sides of each coupling capacitor C3. In the embodiment, the collector load resistors R 2 and base biasing resistors R 3 are all connected to the common supply line 12, being separated by resistors R 4 , and the line 12 is fed from the output of a D.C. amplifier 17 fed from detector 15 via low-pass filter 16. A tuned stage 13 is interposed between the R/C coupled amplifier and the detector, the arrangement being intended as an I.F. amplifier and being such that instability due to phase-shifts around the loop circuit including the a.g.c. path is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2588167A GB1155772A (en) | 1967-06-05 | 1967-06-05 | Improvements in Multistage Transistor Amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2588167A GB1155772A (en) | 1967-06-05 | 1967-06-05 | Improvements in Multistage Transistor Amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1155772A true GB1155772A (en) | 1969-06-18 |
Family
ID=10234890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2588167A Expired GB1155772A (en) | 1967-06-05 | 1967-06-05 | Improvements in Multistage Transistor Amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1155772A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3683290A (en) * | 1970-11-13 | 1972-08-08 | Gould Inc | Automatic volume control through preamplifier supply voltages |
| US5990746A (en) * | 1996-09-12 | 1999-11-23 | Nokia Mobile Phones Limited | Amplifier system |
-
1967
- 1967-06-05 GB GB2588167A patent/GB1155772A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3683290A (en) * | 1970-11-13 | 1972-08-08 | Gould Inc | Automatic volume control through preamplifier supply voltages |
| US5990746A (en) * | 1996-09-12 | 1999-11-23 | Nokia Mobile Phones Limited | Amplifier system |
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