JPS5526776A - Video signal processing circuit - Google Patents
Video signal processing circuitInfo
- Publication number
- JPS5526776A JPS5526776A JP10023078A JP10023078A JPS5526776A JP S5526776 A JPS5526776 A JP S5526776A JP 10023078 A JP10023078 A JP 10023078A JP 10023078 A JP10023078 A JP 10023078A JP S5526776 A JPS5526776 A JP S5526776A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- differential amplifier
- pedestal
- output
- potential
- 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.)
- Pending
Links
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To vary a pedestal level without sacrificing an input dynamic range by holding a sampled pedestal potential and by controlling the control electrode of the current absorption element of the 1st differential amplifier by the potential.
CONSTITUTION: A video signal inputted to terminal 41 is passed through the 1st differential amplifier composed of transistors Tr1a, Tr1b and Tr1c and then led out to output terminal 46 by way of buffer Tr2. The pedestal part of this output signal is sampled by the 2nd differential amplifier consisting of Trs 6a, 6b and 6c, sampling pulse application terminal 42, and resistances 18 and 20. Its output is supplied to terminal 42 through Tr5 of the switching circuit and sampling buffers Tr3 and Tr4, and capacitor 51 holds the pedestal output. This potential is applied to the base of current absorption Tr1c and fixed bias 31 is also applied to the base of Tr1b. As a result, when the voltage of terminal 43 is varied, the input operation point of the 1st differential amplifier is not shifted to one side and the outout of terminal 46 can be varied without sacrificing the input dynamic range.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10023078A JPS5526776A (en) | 1978-08-16 | 1978-08-16 | Video signal processing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10023078A JPS5526776A (en) | 1978-08-16 | 1978-08-16 | Video signal processing circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5526776A true JPS5526776A (en) | 1980-02-26 |
Family
ID=14268465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10023078A Pending JPS5526776A (en) | 1978-08-16 | 1978-08-16 | Video signal processing circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5526776A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59188335A (en) * | 1983-04-08 | 1984-10-25 | 三菱電機株式会社 | Ground-fault detecting circuit |
-
1978
- 1978-08-16 JP JP10023078A patent/JPS5526776A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59188335A (en) * | 1983-04-08 | 1984-10-25 | 三菱電機株式会社 | Ground-fault detecting circuit |
JPH031893B2 (en) * | 1983-04-08 | 1991-01-11 | Mitsubishi Electric Corp |
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