JPS54138356A - High impedance input circuit - Google Patents

High impedance input circuit

Info

Publication number
JPS54138356A
JPS54138356A JP4626578A JP4626578A JPS54138356A JP S54138356 A JPS54138356 A JP S54138356A JP 4626578 A JP4626578 A JP 4626578A JP 4626578 A JP4626578 A JP 4626578A JP S54138356 A JPS54138356 A JP S54138356A
Authority
JP
Japan
Prior art keywords
power supply
capacitor
input circuit
high impedance
fetq1
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
JP4626578A
Other languages
Japanese (ja)
Inventor
Kiyoshi Sakai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4626578A priority Critical patent/JPS54138356A/en
Publication of JPS54138356A publication Critical patent/JPS54138356A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To reduce the time until the operation is made stable after power supply is applied, by providing the means shortening the input terminals at the application of power supply, in the high input impedance circuit using FET's. CONSTITUTION:The potential of the gate G of FETQ1 is made equal to the drain voltage in timing with the drain to gate capacitance CGD, and simultaneously, the transistor Q2 is conductive through the capacitor CB. Thus, the high resistance RG is shortened and the capacitor CGD is rapidly charged up. When the capacitor CB is charged, the transistor Q2 is turned off. Accordingly, the inpedance of FETQ1 is decreased for a short time at the application of power supply, and the operation is made stable in a short time.
JP4626578A 1978-04-19 1978-04-19 High impedance input circuit Pending JPS54138356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4626578A JPS54138356A (en) 1978-04-19 1978-04-19 High impedance input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4626578A JPS54138356A (en) 1978-04-19 1978-04-19 High impedance input circuit

Publications (1)

Publication Number Publication Date
JPS54138356A true JPS54138356A (en) 1979-10-26

Family

ID=12742374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4626578A Pending JPS54138356A (en) 1978-04-19 1978-04-19 High impedance input circuit

Country Status (1)

Country Link
JP (1) JPS54138356A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995017040A1 (en) * 1993-12-17 1995-06-22 National Semiconductor Corporation Click/pop free bias circuit
FR2762726A1 (en) * 1997-04-29 1998-10-30 Sgs Thomson Microelectronics Short-circuit protection for amplifier output stage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995017040A1 (en) * 1993-12-17 1995-06-22 National Semiconductor Corporation Click/pop free bias circuit
FR2762726A1 (en) * 1997-04-29 1998-10-30 Sgs Thomson Microelectronics Short-circuit protection for amplifier output stage

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