JPS55120215A - Control circuit for continuous resistance of field effect transistor - Google Patents
Control circuit for continuous resistance of field effect transistorInfo
- 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
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.
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)
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 |
-
1979
- 1979-03-07 JP JP2694179A patent/JPS55120215A/en active Pending
Cited By (5)
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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