WO2007087630A3 - Notch filter for ripple reduction in chopper stabilized amplifiers - Google Patents

Notch filter for ripple reduction in chopper stabilized amplifiers Download PDF

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Publication number
WO2007087630A3
WO2007087630A3 PCT/US2007/061139 US2007061139W WO2007087630A3 WO 2007087630 A3 WO2007087630 A3 WO 2007087630A3 US 2007061139 W US2007061139 W US 2007061139W WO 2007087630 A3 WO2007087630 A3 WO 2007087630A3
Authority
WO
WIPO (PCT)
Prior art keywords
output
chopper
transconductance amplifier
operational transconductance
notch filter
Prior art date
Application number
PCT/US2007/061139
Other languages
French (fr)
Other versions
WO2007087630A2 (en
Inventor
Rodney T Burt
Joy Y Zhang
Original Assignee
Texas Instruments Inc
Rodney T Burt
Joy Y Zhang
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 Texas Instruments Inc, Rodney T Burt, Joy Y Zhang filed Critical Texas Instruments Inc
Priority to EP07762382.5A priority Critical patent/EP1982411B1/en
Priority to CN2007800105586A priority patent/CN101536306B/en
Publication of WO2007087630A2 publication Critical patent/WO2007087630A2/en
Publication of WO2007087630A3 publication Critical patent/WO2007087630A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
    • H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
    • H03F3/45968—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by offset reduction
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • 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
    • H03F3/38—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/387—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters
    • H03H19/004—Switched capacitor networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/261—Amplifier which being suitable for instrumentation applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/459—Ripple reduction circuitry being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45212—Indexing scheme relating to differential amplifiers the differential amplifier being designed to have a reduced offset
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H2011/0488—Notch or bandstop filters

Abstract

A chopper-stabilized amplifier receiving an input signal includes a first operational transconductance amplifier (2) having an input chopper and an output chopper for chopping an output signal produced by the first operational transconductance amplifier. A switched capacitor notch filter (15) will filter the chopped output signal by operating synchronously with the chopping frequency of output chopper to filter ripple voltages that otherwise would be produced by the output chopper. In one embodiment a second operational transconductance amplifier amplifies the notch filter output. The input signal is fed forward, summed with the output of the second operational transconductance amplifier, and applied to the input of a fourth operational transconductance amplifier. Ripple noise and offset are substantially reduced.
PCT/US2007/061139 2006-01-26 2007-01-26 Notch filter for ripple reduction in chopper stabilized amplifiers WO2007087630A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07762382.5A EP1982411B1 (en) 2006-01-26 2007-01-26 Notch filter for ripple reduction in chopper stabilized amplifiers
CN2007800105586A CN101536306B (en) 2006-01-26 2007-01-26 Notch filter for ripple reduction in chopper stabilized amplifiers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/340,223 2006-01-26
US11/340,223 US7292095B2 (en) 2006-01-26 2006-01-26 Notch filter for ripple reduction in chopper stabilized amplifiers

Publications (2)

Publication Number Publication Date
WO2007087630A2 WO2007087630A2 (en) 2007-08-02
WO2007087630A3 true WO2007087630A3 (en) 2008-11-06

Family

ID=38284943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/061139 WO2007087630A2 (en) 2006-01-26 2007-01-26 Notch filter for ripple reduction in chopper stabilized amplifiers

Country Status (5)

Country Link
US (1) US7292095B2 (en)
EP (1) EP1982411B1 (en)
KR (1) KR101010501B1 (en)
CN (1) CN101536306B (en)
WO (1) WO2007087630A2 (en)

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Also Published As

Publication number Publication date
US20070170981A1 (en) 2007-07-26
US7292095B2 (en) 2007-11-06
EP1982411A4 (en) 2009-05-13
KR101010501B1 (en) 2011-01-21
EP1982411B1 (en) 2018-08-15
WO2007087630A2 (en) 2007-08-02
KR20080091376A (en) 2008-10-10
CN101536306B (en) 2012-03-28
CN101536306A (en) 2009-09-16
EP1982411A2 (en) 2008-10-22

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