WO2004025827A3 - Transconductance amplifiers - Google Patents

Transconductance amplifiers Download PDF

Info

Publication number
WO2004025827A3
WO2004025827A3 PCT/GB2003/003941 GB0303941W WO2004025827A3 WO 2004025827 A3 WO2004025827 A3 WO 2004025827A3 GB 0303941 W GB0303941 W GB 0303941W WO 2004025827 A3 WO2004025827 A3 WO 2004025827A3
Authority
WO
WIPO (PCT)
Prior art keywords
input
difference
conductor
voltage
difference amplifier
Prior art date
Application number
PCT/GB2003/003941
Other languages
French (fr)
Other versions
WO2004025827A2 (en
Inventor
Edward Mauger Granville
Original Assignee
Wolfson 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
Priority claimed from GB0220990A external-priority patent/GB2393055B/en
Application filed by Wolfson Ltd filed Critical Wolfson Ltd
Priority to AU2003264757A priority Critical patent/AU2003264757A1/en
Publication of WO2004025827A2 publication Critical patent/WO2004025827A2/en
Publication of WO2004025827A3 publication Critical patent/WO2004025827A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/005—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/36—Analogue value compared with reference values simultaneously only, i.e. parallel type
    • H03M1/361—Analogue value compared with reference values simultaneously only, i.e. parallel type having a separate comparator and reference value for each quantisation level, i.e. full flash converter type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit
    • H03M1/16—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps
    • H03M1/164—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps the steps being performed sequentially in series-connected stages
    • H03M1/167—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps the steps being performed sequentially in series-connected stages all stages comprising simultaneous converters

Abstract

The invention relates to transconductance amplifiers in which an output current depends upon the difference between two input voltages, and to the application of such transconductance amplifiers in analogue-to-digital converters. A difference amplifier (300) is configured for providing an output current dependent upon a difference between a first input voltage (302) and a second input voltage (304). The difference amplifier comprises an input sampling capacitor (318) coupled to a first conductor of said input sampling capacitor and a current output (314) for generating said output current; and an input switch (308, 310) for selectively coupling a second conductor of said input sampling capacitor to a first input of said difference amplifier for receiving said first input voltage and to a second input of said difference amplifier for receiving said second input voltage. The difference amplifier is configured to, in a first state, couple said second conductor to one of said first and second inputs and apply a voltage to said first conductor and to, in a second state, couple said second conductor to the other of said first and second inputs to provide a voltage change to said transconductance amplifier input dependent upon said difference between said first and second input voltages.
PCT/GB2003/003941 2002-09-10 2003-09-10 Transconductance amplifiers WO2004025827A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003264757A AU2003264757A1 (en) 2002-09-10 2003-09-10 Transconductance amplifiers

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0220990.6 2002-09-10
GB0220990A GB2393055B (en) 2002-09-10 2002-09-10 Transconductance amplifiers
US10/247,357 2002-09-20
US10/247,357 US6831507B2 (en) 2002-09-10 2002-09-20 Transconductance amplifiers

Publications (2)

Publication Number Publication Date
WO2004025827A2 WO2004025827A2 (en) 2004-03-25
WO2004025827A3 true WO2004025827A3 (en) 2004-07-01

Family

ID=31995695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/003941 WO2004025827A2 (en) 2002-09-10 2003-09-10 Transconductance amplifiers

Country Status (3)

Country Link
CN (1) CN100511978C (en)
AU (1) AU2003264757A1 (en)
WO (1) WO2004025827A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102844983B (en) * 2010-03-02 2015-07-15 马维尔国际贸易有限公司 Dual carrier amplifier circuits and methods
CN102403966B (en) * 2010-09-14 2015-07-22 意法半导体研发（上海）有限公司 Method and device for reducing input differential pairs of voltage interpolation amplifier of digital-to-analog converter
US9264002B2 (en) * 2014-02-19 2016-02-16 Analog Devices Global Apparatus and methods for improving common mode rejection ratio
US9294037B2 (en) * 2014-03-24 2016-03-22 Analog Devices Global Apparatus and methods for autozero amplifiers
TWI545890B (en) * 2014-05-09 2016-08-11 友達光電股份有限公司 Electronic device and comparator thereof
KR102509819B1 (en) * 2015-11-04 2023-03-14 삼성전자주식회사 Signal processing apparatus and signal processing method
CN107947794B (en) * 2017-11-30 2021-02-26 无锡中微爱芯电子有限公司 Error correction circuit for correcting offset error of analog-to-digital converter
CN110120814B (en) * 2019-04-25 2021-05-04 电子科技大学 Current comparator for eliminating offset error and comparison method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404525A (en) * 1981-03-03 1983-09-13 American Microsystems, Inc. Switched capacitor gain stage with offset and switch feedthrough cancellation scheme
FR2604835A1 (en) * 1986-10-07 1988-04-08 Efcis High-gain switched-capacitance amplifier
US6011433A (en) * 1998-10-22 2000-01-04 Pmc-Sierra Ltd. Generalized procedure for the calibration of switched capacitor gain stages
US6150851A (en) * 1997-06-06 2000-11-21 Tadahiro Ohmi Charge transfer amplifier circuit, voltage comparator, and sense amplifier
US6169427B1 (en) * 1998-12-10 2001-01-02 National Semiconductor Corporation Sample and hold circuit having single-ended input and differential output and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404525A (en) * 1981-03-03 1983-09-13 American Microsystems, Inc. Switched capacitor gain stage with offset and switch feedthrough cancellation scheme
FR2604835A1 (en) * 1986-10-07 1988-04-08 Efcis High-gain switched-capacitance amplifier
US6150851A (en) * 1997-06-06 2000-11-21 Tadahiro Ohmi Charge transfer amplifier circuit, voltage comparator, and sense amplifier
US6011433A (en) * 1998-10-22 2000-01-04 Pmc-Sierra Ltd. Generalized procedure for the calibration of switched capacitor gain stages
US6169427B1 (en) * 1998-12-10 2001-01-02 National Semiconductor Corporation Sample and hold circuit having single-ended input and differential output and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BILHAN H ET AL: "A 13 bit 20 Ms/s current mode pipelined analog to digital converter", 1999 IEEE, vol. 1, 8 August 1999 (1999-08-08), pages 186 - 189, XP010510604 *
FONG K L ET AL: "A 10 bit semi-automatic current mode DAC", PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. (ISCS). CHICAGO, MAY 3 - 6, 1993, NEW YORK, IEEE, US, vol. 2, 3 May 1993 (1993-05-03), pages 978 - 981, XP010115264, ISBN: 0-7803-1281-3 *

Also Published As

Publication number Publication date
AU2003264757A1 (en) 2004-04-30
WO2004025827A2 (en) 2004-03-25
AU2003264757A8 (en) 2004-04-30
CN100511978C (en) 2009-07-08
CN1682437A (en) 2005-10-12

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