JPS55120215A - Control circuit for continuous resistance of field effect transistor - Google Patents

Control circuit for continuous resistance of field effect transistor

Info

Publication number
JPS55120215A
JPS55120215A JP2694179A JP2694179A JPS55120215A JP S55120215 A JPS55120215 A JP S55120215A JP 2694179 A JP2694179 A JP 2694179A JP 2694179 A JP2694179 A JP 2694179A JP S55120215 A JPS55120215 A JP S55120215A
Authority
JP
Japan
Prior art keywords
fet
continuous resistance
fett14
amplifier
resistance
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
JP2694179A
Other languages
Japanese (ja)
Inventor
Yukio Kino
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.)
NIPPON HAMONDO KK
Original Assignee
NIPPON HAMONDO KK
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 NIPPON HAMONDO KK filed Critical NIPPON HAMONDO KK
Priority to JP2694179A priority Critical patent/JPS55120215A/en
Publication of JPS55120215A publication Critical patent/JPS55120215A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/24—Frequency-independent attenuators
    • H03H11/245—Frequency-independent attenuators using field-effect transistor

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To enable a simple circuit to control a continuous resistance of FET's by forming the fixed circuit. CONSTITUTION:Gates of FET's T11-T13 of the same characteristics and that of FETT14 of the same characteristics are connected in common and sources of FET's are all grounded. The gates of respective FET's are connected to the output of operational amplifier A and the drain of FETT14 to the positive input of amplifier A. As a result, since amplifier A forms a negative feedback loop via FETT14, the output, i.e., the gate voltage of FET14 is controlled to equalized voltages applied to positive and negative inputs of amplifier A, so that the continuous resistance will vary. Accordingly, the continuous resistance of FET's T11-T13 of the same characteristics becomes equal to the resistance of FETT14. Thus, the continuous resistance of the FET's can be controlled by the simple circuit.
JP2694179A 1979-03-07 1979-03-07 Control circuit for continuous resistance of field effect transistor Pending JPS55120215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2694179A JPS55120215A (en) 1979-03-07 1979-03-07 Control circuit for continuous resistance of field effect transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2694179A JPS55120215A (en) 1979-03-07 1979-03-07 Control circuit for continuous resistance of field effect transistor

Publications (1)

Publication Number Publication Date
JPS55120215A true JPS55120215A (en) 1980-09-16

Family

ID=12207168

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2694179A Pending JPS55120215A (en) 1979-03-07 1979-03-07 Control circuit for continuous resistance of field effect transistor

Country Status (1)

Country Link
JP (1) JPS55120215A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568683A1 (en) * 1984-08-03 1986-02-07 Thomson Csf Modular dynamic load
JPH05199070A (en) * 1991-03-14 1993-08-06 Bull Sa Integrated circuit having variable impedance and information processing system using said integrated circuit
JP2004140423A (en) * 2002-10-15 2004-05-13 Denso Corp Load driver circuit with current detecting function
JP2008071376A (en) * 2006-09-12 2008-03-27 Sony Corp Current-voltage conversion circuit, photodetector circuit equipped with same, and optical disk device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568683A1 (en) * 1984-08-03 1986-02-07 Thomson Csf Modular dynamic load
JPH05199070A (en) * 1991-03-14 1993-08-06 Bull Sa Integrated circuit having variable impedance and information processing system using said integrated circuit
US5398261A (en) * 1991-03-14 1995-03-14 Bull S.A. Integrated circuit having controller impedances and application to transceivers, in particular for communication between units of a system
JP2004140423A (en) * 2002-10-15 2004-05-13 Denso Corp Load driver circuit with current detecting function
JP2008071376A (en) * 2006-09-12 2008-03-27 Sony Corp Current-voltage conversion circuit, photodetector circuit equipped with same, and optical disk device

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