ES8700502A1 - A field effect transistor current source. - Google Patents

A field effect transistor current source.

Info

Publication number
ES8700502A1
ES8700502A1 ES547346A ES547346A ES8700502A1 ES 8700502 A1 ES8700502 A1 ES 8700502A1 ES 547346 A ES547346 A ES 547346A ES 547346 A ES547346 A ES 547346A ES 8700502 A1 ES8700502 A1 ES 8700502A1
Authority
ES
Spain
Prior art keywords
field effect
effect transistor
circuit
current source
transistor current
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.)
Expired
Application number
ES547346A
Other languages
Spanish (es)
Other versions
ES547346A0 (en
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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
Priority claimed from US06/656,343 external-priority patent/US4645948A/en
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of ES547346A0 publication Critical patent/ES547346A0/en
Publication of ES8700502A1 publication Critical patent/ES8700502A1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/26—Current mirrors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/26—Current mirrors
    • G05F3/262—Current mirrors using field-effect transistors only

Abstract

A field effect transistor circuit generates a reference current (IR) that can obtain a desired temperature coefficient. The circuit is self-compensatory with respect to process variations, in that a "slow" process will produce a higher than normal current, while a "fast" process will give a lower one. This results in a tight spread of slew-rate, gain, gain-bandwidth, etc. in op-amps, comparators, and other linear circuits. A simple adjustment in the circuit allows the temperature coefficient to be made positive or negative if so desired. An illustrative circuit is shown for CMOS technology, but can be applied to other field effect technologies.
ES547346A 1984-10-01 1985-09-26 A field effect transistor current source. Expired ES8700502A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/656,343 US4645948A (en) 1984-10-01 1984-10-01 Field effect transistor current source
US68599084A 1984-12-24 1984-12-24

Publications (2)

Publication Number Publication Date
ES547346A0 ES547346A0 (en) 1986-10-16
ES8700502A1 true ES8700502A1 (en) 1986-10-16

Family

ID=27097177

Family Applications (1)

Application Number Title Priority Date Filing Date
ES547346A Expired ES8700502A1 (en) 1984-10-01 1985-09-26 A field effect transistor current source.

Country Status (8)

Country Link
EP (1) EP0197965B1 (en)
KR (1) KR880700349A (en)
CA (1) CA1252835A (en)
DE (1) DE3581399D1 (en)
ES (1) ES8700502A1 (en)
HK (1) HK44692A (en)
SG (1) SG84291G (en)
WO (1) WO1986002180A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4868416A (en) * 1987-12-15 1989-09-19 Gazelle Microcircuits, Inc. FET constant reference voltage generator
US5608314A (en) * 1994-04-11 1997-03-04 Advanced Micro Devices, Inc. Incremental output current generation circuit
FR2866724B1 (en) 2004-02-20 2007-02-16 Atmel Nantes Sa DEVICE FOR GENERATING AN IMPROVED PRECISION REFERENCE ELECTRICAL VOLTAGE AND CORRESPONDING ELECTRONIC INTEGRATED CIRCUIT
US10205313B2 (en) 2015-07-24 2019-02-12 Symptote Technologies, LLC Two-transistor devices for protecting circuits from sustained overcurrent
KR102521293B1 (en) 2015-09-21 2023-04-12 심프토트 테크놀로지스 엘엘씨 The single transistor apparatus for the circuit protection and autocatalytic voltage change

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009432A (en) * 1975-09-04 1977-02-22 Rca Corporation Constant current supply
US4051392A (en) * 1976-04-08 1977-09-27 Rca Corporation Circuit for starting current flow in current amplifier circuits

Also Published As

Publication number Publication date
HK44692A (en) 1992-06-26
WO1986002180A1 (en) 1986-04-10
ES547346A0 (en) 1986-10-16
EP0197965B1 (en) 1991-01-16
SG84291G (en) 1991-11-22
DE3581399D1 (en) 1991-02-21
KR880700349A (en) 1988-02-22
CA1252835A (en) 1989-04-18
EP0197965A1 (en) 1986-10-22

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19970401