WO1991007825A3 - Termination circuit for an r-2r ladder that compensates for temperature drift - Google Patents

Termination circuit for an r-2r ladder that compensates for temperature drift Download PDF

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Publication number
WO1991007825A3
WO1991007825A3 PCT/US1990/006790 US9006790W WO9107825A3 WO 1991007825 A3 WO1991007825 A3 WO 1991007825A3 US 9006790 W US9006790 W US 9006790W WO 9107825 A3 WO9107825 A3 WO 9107825A3
Authority
WO
WIPO (PCT)
Prior art keywords
emitter
ladder
voltage
transistors
excitation source
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.)
Ceased
Application number
PCT/US1990/006790
Other languages
French (fr)
Other versions
WO1991007825A2 (en
Inventor
A Paul Brokaw
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.)
Analog Devices Inc
Original Assignee
Analog Devices 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
Application filed by Analog Devices Inc filed Critical Analog Devices Inc
Priority to DE69031620T priority Critical patent/DE69031620T2/en
Priority to EP91901034A priority patent/EP0454841B1/en
Publication of WO1991007825A2 publication Critical patent/WO1991007825A2/en
Publication of WO1991007825A3 publication Critical patent/WO1991007825A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
    • H03M1/089—Continuously compensating for, or preventing, undesired influence of physical parameters of noise of temperature variations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/74—Simultaneous conversion
    • H03M1/78—Simultaneous conversion using ladder network
    • H03M1/785—Simultaneous conversion using ladder network using resistors, i.e. R-2R ladders

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)

Abstract

A termination circuit for an R-2R ladder network for producing weighted currents, the 2R terminating resistor of the ladder being connected to an excitation source voltage which is 2(kT/q)ln2 closer to the supply voltage than the emitter of the current source in the last (i.e., least significant) leg of the ladder. The excitation source is fabricated with just one type of bipolar transistor and does not require an amplifier or frequency compensation capacitor(s). The excitation source is a simple circuit requiring only five transistors, at least one of which has an emitter area which is a multiple of the emitter areas of the current source transistors. The base-emitter voltages of the transistors in the excitation source are connected in a voltage loop that goes from a voltage VLSB at the emitter of the current source transistor connected to the least significant ladder network shunt resistor to a voltage, Vt, which would be equal to VLSB, if all six transistors in the loop had the same emitter area, but which deviates therefrom by 2(kT/q)ln2 due to the differences in the emitter areas.
PCT/US1990/006790 1989-11-20 1990-11-19 Termination circuit for an r-2r ladder that compensates for temperature drift Ceased WO1991007825A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69031620T DE69031620T2 (en) 1989-11-20 1990-11-19 FINAL CIRCUIT WITH TEMPERATURE DRIFT COMPENSATION FOR AN R-2R CHAIN NETWORK
EP91901034A EP0454841B1 (en) 1989-11-20 1990-11-19 Termination circuit for an r-2r ladder that compensates for temperature drift

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/439,821 US5119094A (en) 1989-11-20 1989-11-20 Termination circuit for an r-2r, ladder that compensates for the temperature drift caused by different current densities along the ladder, using one type of biopolar transistor
US439,821 1989-11-20

Publications (2)

Publication Number Publication Date
WO1991007825A2 WO1991007825A2 (en) 1991-05-30
WO1991007825A3 true WO1991007825A3 (en) 1991-06-27

Family

ID=23746268

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/006790 Ceased WO1991007825A2 (en) 1989-11-20 1990-11-19 Termination circuit for an r-2r ladder that compensates for temperature drift

Country Status (5)

Country Link
US (1) US5119094A (en)
EP (1) EP0454841B1 (en)
JP (1) JPH04505240A (en)
DE (1) DE69031620T2 (en)
WO (1) WO1991007825A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130675A1 (en) * 1991-09-14 1993-03-18 Philips Patentverwaltung MULTIPLICING DIGITAL-ANALOG CONVERTER
JP2003507919A (en) * 1999-08-13 2003-02-25 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Analog-to-digital converter
US7095351B2 (en) * 2004-09-20 2006-08-22 Analog Devices, Inc. Digital-to-analog converter structures
GB2568108B (en) 2017-11-07 2021-06-30 Analog Devices Global Current steering digital to analog converter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2081040A (en) * 1980-07-30 1982-02-10 Analog Devices Inc Digital-to-analogue converter with improved compensation arrangement for offset voltage variations

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893018A (en) * 1973-12-20 1975-07-01 Motorola Inc Compensated electronic voltage source
US3940760A (en) * 1975-03-21 1976-02-24 Analog Devices, Inc. Digital-to-analog converter with current source transistors operated accurately at different current densities
US4176344A (en) * 1975-05-28 1979-11-27 Bell Telephone Laboratories, Incorporated Integrated circuit binary weighted digital-to-analog converter
JPS59107612A (en) * 1982-12-10 1984-06-21 Hitachi Ltd Constant current device
US4899152A (en) * 1986-12-23 1990-02-06 Analog Devices, Inc. Method and apparatus for temperature compensating a digital to analog converter
US4882533A (en) * 1987-08-28 1989-11-21 Unitrode Corporation Linear integrated circuit voltage drop generator having a base-10-emitter voltage independent current source therein

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2081040A (en) * 1980-07-30 1982-02-10 Analog Devices Inc Digital-to-analogue converter with improved compensation arrangement for offset voltage variations

Also Published As

Publication number Publication date
US5119094A (en) 1992-06-02
EP0454841B1 (en) 1997-10-22
WO1991007825A2 (en) 1991-05-30
DE69031620D1 (en) 1997-11-27
DE69031620T2 (en) 1998-02-12
EP0454841A1 (en) 1991-11-06
JPH04505240A (en) 1992-09-10

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