JPS5487048A - Input protective circuit - Google Patents

Input protective circuit

Info

Publication number
JPS5487048A
JPS5487048A JP15478277A JP15478277A JPS5487048A JP S5487048 A JPS5487048 A JP S5487048A JP 15478277 A JP15478277 A JP 15478277A JP 15478277 A JP15478277 A JP 15478277A JP S5487048 A JPS5487048 A JP S5487048A
Authority
JP
Japan
Prior art keywords
terminal
protective circuit
input
gate type
insulator
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
JP15478277A
Other languages
Japanese (ja)
Inventor
Keizo Aoyama
Masakazu Matsuda
Eiji Noguchi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15478277A priority Critical patent/JPS5487048A/en
Publication of JPS5487048A publication Critical patent/JPS5487048A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general

Landscapes

  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To reduce the function of the lateral transistor by forming the input protective circuit with the impedance element plus the 1st and 2nd insulator gate type transistors. CONSTITUTION:Resistive impedance R1 is connected to input terminal 10 corresponding to the terminal pad and the other end 11 is connected to the internal circuit. Insulator gate type field effect transistor Q1 is connected to the other end of R1, and one electrode of Q1 is connected to earth potential VSS. And 2nd insulator gate type field effect transistor Q2 is connected between the gate of Q1 and potential VSS, and fixed voltage VCC higher than the threshold voltage is applied to the gate. When OV and the positive voltage of the VCC level are applied to terminal 10, no effect of increment of the leak current is given to the normal input level owing to existence of the input protective circuit. In case the negative under-shoot pulse is applied to terminal 10, the potential change is reduced at terminal 11 in terms of both DC and AC.
JP15478277A 1977-12-22 1977-12-22 Input protective circuit Pending JPS5487048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15478277A JPS5487048A (en) 1977-12-22 1977-12-22 Input protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15478277A JPS5487048A (en) 1977-12-22 1977-12-22 Input protective circuit

Publications (1)

Publication Number Publication Date
JPS5487048A true JPS5487048A (en) 1979-07-11

Family

ID=15591772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15478277A Pending JPS5487048A (en) 1977-12-22 1977-12-22 Input protective circuit

Country Status (1)

Country Link
JP (1) JPS5487048A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129413A (en) * 1980-03-14 1981-10-09 Mitsubishi Electric Corp Variable limiter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129413A (en) * 1980-03-14 1981-10-09 Mitsubishi Electric Corp Variable limiter

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