GB1324678A - Gain controlled amplifier - Google Patents
Gain controlled amplifierInfo
- Publication number
- GB1324678A GB1324678A GB1324678DA GB1324678A GB 1324678 A GB1324678 A GB 1324678A GB 1324678D A GB1324678D A GB 1324678DA GB 1324678 A GB1324678 A GB 1324678A
- Authority
- GB
- United Kingdom
- Prior art keywords
- semi
- variation
- amplifier
- terminals
- amplification
- 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
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
1324678 Transistor gain control circuits STANDARD TELEPHONES & CABLES Ltd 29 June 1972 30410/72 Heading H3T In a semi-conductor amplifier 1 in which the amplification is controlled by variation of a control signal, applied to terminals 7, 8, a variable signal is produced by variation of a resistor 11 coupled to the power supply input 9, 10 of the amplifier and is applied to the input of a semi-conductor circuit, i.e. comprising transistors 16, 33, which produces the control signal in response thereto, the semi-conductor circuit being arranged to produce an output signal, at terminals 7, 8 whose variation makes the ratio of the amplification change to resistance change substantially constant. In the embodiment, the arrangement is stabilized by means of Zener diode 24 while a diode 15 provides for temperature compensation: a pre-settable resistor 18 enables the emitter voltage of transistor 16 to be set appropriately.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3041072 | 1972-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1324678A true GB1324678A (en) | 1973-07-25 |
Family
ID=10307268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1324678D Expired GB1324678A (en) | 1972-06-29 | 1972-06-29 | Gain controlled amplifier |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES416395A1 (en) |
| GB (1) | GB1324678A (en) |
-
1972
- 1972-06-29 GB GB1324678D patent/GB1324678A/en not_active Expired
-
1973
- 1973-06-28 ES ES416395A patent/ES416395A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES416395A1 (en) | 1976-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |