GB1099230A - Improvements in or relating to signal level control arrangements - Google Patents
Improvements in or relating to signal level control arrangementsInfo
- Publication number
- GB1099230A GB1099230A GB4033466A GB4033466A GB1099230A GB 1099230 A GB1099230 A GB 1099230A GB 4033466 A GB4033466 A GB 4033466A GB 4033466 A GB4033466 A GB 4033466A GB 1099230 A GB1099230 A GB 1099230A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistors
- pair
- fed
- commoned
- sept
- 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
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
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
- H03G1/0017—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
- H03G1/0023—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 in emitter-coupled or cascode amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/148—Video amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,099,230. Transistor amplifier circuits. FERNSEH G.m.b.H. Sept. 9, 1966 [Sept. 10, 1965], No. 40334/66. Heading H3T. In a variable gain amplifier for a video signal an input 8 is fed to the commoned emitters of a pair of PNP transistors 4, 5 and to the commoned emitters of a pair of NPN transistors 2, 3. One of each pair of transistors 2, 4 has its base and collector connected to reference potentials, and the other two 3, 5 have their bases connected to a variable gain control 27 and their collectors connected in parallel to an output terminal 14. The input signal is fed to the commoned emitter circuits via further transistors 1, 6 which have their bases biased by network 17, 18, 19 so as to add equal and opposite D.C. components to the signals fed to the two emitter coupled pairs. Variation of resistor 27 varies the division of currents II, 16 between the pairs 4, 5 and 2, 3 respectively thus varying the gain without changing the means D.C. in the output circuit. Diodes may be included in the coupling of transistors 1 and 6 to their respective emitter coupled pairs.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF0047151 | 1965-09-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1099230A true GB1099230A (en) | 1968-01-17 |
Family
ID=7101454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4033466A Expired GB1099230A (en) | 1965-09-10 | 1966-09-09 | Improvements in or relating to signal level control arrangements |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1437981A1 (en) |
| GB (1) | GB1099230A (en) |
| NL (1) | NL6612745A (en) |
-
1965
- 1965-09-10 DE DE19651437981 patent/DE1437981A1/en active Pending
-
1966
- 1966-09-09 GB GB4033466A patent/GB1099230A/en not_active Expired
- 1966-09-09 NL NL6612745A patent/NL6612745A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL6612745A (en) | 1967-03-13 |
| DE1437981A1 (en) | 1969-02-13 |
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