JPS5748874A - Video signal processing circuit - Google Patents

Video signal processing circuit

Info

Publication number
JPS5748874A
JPS5748874A JP55123454A JP12345480A JPS5748874A JP S5748874 A JPS5748874 A JP S5748874A JP 55123454 A JP55123454 A JP 55123454A JP 12345480 A JP12345480 A JP 12345480A JP S5748874 A JPS5748874 A JP S5748874A
Authority
JP
Japan
Prior art keywords
fet
voltage
pinch
source
input voltage
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
Application number
JP55123454A
Other languages
Japanese (ja)
Inventor
Yoshinori Horiko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55123454A priority Critical patent/JPS5748874A/en
Publication of JPS5748874A publication Critical patent/JPS5748874A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To achieve a simple gamma compensation cancel circuit with good frequency characteristics, less power consumption, by using the square characteristic of a FET and rejecting the effect of offset of the transistor. CONSTITUTION:FETs TR4, 5 are N channel junction type formed on the same board and the TR5 is used for pinch-off voltage detection. The drain of the FET TR5 is connected to a positive power supply VDD, and the gate is connected to ground at which the input voltage V1 is at black level, and a minute current source ISS1 is inserted between the source of the FET TR5 and a negative power supply -Vss, and a voltage VGS between the gate and the source of the FET TR5 is biased to the pinch-off voltage Vp. Thus, the FET TR4 is biased so that it is just the pinch-off voltage when the input voltage V1 is zero, and the drain current ID4 of the FET TR4 against the input voltage V1 has a square characteristic without offset- voltage.
JP55123454A 1980-09-08 1980-09-08 Video signal processing circuit Pending JPS5748874A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55123454A JPS5748874A (en) 1980-09-08 1980-09-08 Video signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55123454A JPS5748874A (en) 1980-09-08 1980-09-08 Video signal processing circuit

Publications (1)

Publication Number Publication Date
JPS5748874A true JPS5748874A (en) 1982-03-20

Family

ID=14861007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55123454A Pending JPS5748874A (en) 1980-09-08 1980-09-08 Video signal processing circuit

Country Status (1)

Country Link
JP (1) JPS5748874A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299000A (en) * 1992-06-17 1994-03-29 Zenith Electronics Corp. Video white signal compression and peaking

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299000A (en) * 1992-06-17 1994-03-29 Zenith Electronics Corp. Video white signal compression and peaking

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