JPS5546666A - Direct-current component regenerating circuit - Google Patents
Direct-current component regenerating circuitInfo
- Publication number
- JPS5546666A JPS5546666A JP12063178A JP12063178A JPS5546666A JP S5546666 A JPS5546666 A JP S5546666A JP 12063178 A JP12063178 A JP 12063178A JP 12063178 A JP12063178 A JP 12063178A JP S5546666 A JPS5546666 A JP S5546666A
- Authority
- JP
- Japan
- Prior art keywords
- base
- direct
- transistor
- adjustements
- varying
- 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.)
- Granted
Links
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To simplify IC-implementation by reducing component elements in number while removing variation in brightness due to contrast adjustements, by nearly eliminating a potential difference between emitters of a gain-control-stage transistor and each constant current transistor.
CONSTITUTION: Video input signal Vi, applied to the base of constant current transistor Q17 through capacitor C is amplified by gain control stage 7 composed of a differential couple of transistors. At this time, contrast adjustements are made by varying each inter-base voltage of the differential couple by variable resistor VR2, and brightness adjustments are made by varying the base potential of Q16 by VR2. Further, the pedestal level of the video input signal supplied to the emitter of Q17 is held by coupled direct-current component regenerating capacitor C and direct-current regneration is carried out. At this time, the emitter voltage of Q17 is applied to the base of Q20 and operation of eliminating nearly the difference in emitter voltage between Q17 and Q18 is performed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53120631A JPS5920313B2 (en) | 1978-09-28 | 1978-09-28 | DC component regeneration circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53120631A JPS5920313B2 (en) | 1978-09-28 | 1978-09-28 | DC component regeneration circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5546666A true JPS5546666A (en) | 1980-04-01 |
JPS5920313B2 JPS5920313B2 (en) | 1984-05-12 |
Family
ID=14790996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53120631A Expired JPS5920313B2 (en) | 1978-09-28 | 1978-09-28 | DC component regeneration circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5920313B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6277925B1 (en) | 1999-03-18 | 2001-08-21 | Hercules Incorporated | Allyl compounds, compositions containing allyl compounds and processes for forming and curing polymer compositions |
-
1978
- 1978-09-28 JP JP53120631A patent/JPS5920313B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6277925B1 (en) | 1999-03-18 | 2001-08-21 | Hercules Incorporated | Allyl compounds, compositions containing allyl compounds and processes for forming and curing polymer compositions |
Also Published As
Publication number | Publication date |
---|---|
JPS5920313B2 (en) | 1984-05-12 |
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