GB1249395A - Low frequency signal amplifier - Google Patents

Low frequency signal amplifier

Info

Publication number
GB1249395A
GB1249395A GB1228569A GB1228569A GB1249395A GB 1249395 A GB1249395 A GB 1249395A GB 1228569 A GB1228569 A GB 1228569A GB 1228569 A GB1228569 A GB 1228569A GB 1249395 A GB1249395 A GB 1249395A
Authority
GB
United Kingdom
Prior art keywords
modulator
amplifier
output
input
voltage
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
GB1228569A
Inventor
Hans Bertil Andersson
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 SE03217/68*[A external-priority patent/SE329415B/xx
Application filed by Bofors AB filed Critical Bofors AB
Publication of GB1249395A publication Critical patent/GB1249395A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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

Abstract

1,249,395. Amplifiers. BOFORS A.B. 7 March, 1969 [11 March, 1968], No. 12285/69. Heading H3T. A chopper-type amplifying arrangement comprises a first modulator 3 feeding into the input of an amplifier 5, the output of which is connected to a rectifier 6. A first feedback path is connected between the output of the amplifier 5 and input of the first modulator 3, comprising in series a first demodulator 10 and first integrating circuit 11, the first demodulator 10 receiving a drive voltage of the same frequency as that for the first modulator and of such phase that the demodulated voltage will have a polarity opposite to that of an unbalance voltage produced by the first modulator. A second feedback path is connected between the input and output of the amplifier 5, comprising in series a second demodulator 13, a second integrating circuit 14 and a second modulator 15 which is driven by a drive voltage of the same frequency as that for the first modulator, but has such a phase relative to the output voltage of the amplifier that the voltage fed from the second modulator 15 to the input of the amplifier counteracts such components of the output of the amplifier 5 as are 90 degrees out of phase with the drive voltage for the first modulator 3. In the embodiment, the input from terminal 1 is fed to the first modulator 3 via a matching unit 2, and the outputs from the first and second modulators are combined in a summing device 4. The modulators and demodulators are driven from an oscillator 8, the drive for the second modulator 15 and second demodulator 13 being applied over a 90 degree phase shifter 16. Limiters 9, 12 are interposed between the output of the amplifier and the demodulators 10, 13 respectively. The integrating circuits 11, 14 are of long timeconstant, the time constant of circuit 11 being longer than that of circuit 14. The arrangement may use transistors.
GB1228569A 1968-03-11 1969-03-07 Low frequency signal amplifier Expired GB1249395A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE312168 1968-03-11
SE03217/68*[A SE329415B (en) 1968-03-11 1968-03-11

Publications (1)

Publication Number Publication Date
GB1249395A true GB1249395A (en) 1971-10-13

Family

ID=26654411

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1228569A Expired GB1249395A (en) 1968-03-11 1969-03-07 Low frequency signal amplifier

Country Status (2)

Country Link
DE (1) DE1911767A1 (en)
GB (1) GB1249395A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7385443B1 (en) 2007-01-31 2008-06-10 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
US7391257B1 (en) 2007-01-31 2008-06-24 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
WO2008094270A1 (en) * 2007-01-31 2008-08-07 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for wireless telemetry
US7623053B2 (en) 2007-09-26 2009-11-24 Medtronic, Inc. Implantable medical device with low power delta-sigma analog-to-digital converter
US7714757B2 (en) 2007-09-26 2010-05-11 Medtronic, Inc. Chopper-stabilized analog-to-digital converter
US8478402B2 (en) 2008-10-31 2013-07-02 Medtronic, Inc. Determining intercardiac impedance
US8554325B2 (en) 2007-10-16 2013-10-08 Medtronic, Inc. Therapy control based on a patient movement state
US8594779B2 (en) 2007-04-30 2013-11-26 Medtronic, Inc. Seizure prediction
US8781595B2 (en) 2007-04-30 2014-07-15 Medtronic, Inc. Chopper mixer telemetry circuit
US9248288B2 (en) 2007-09-26 2016-02-02 Medtronic, Inc. Patient directed therapy control
US9439150B2 (en) 2013-03-15 2016-09-06 Medtronic, Inc. Control of spectral agressors in a physiological signal montoring device
US9521979B2 (en) 2013-03-15 2016-12-20 Medtronic, Inc. Control of spectral agressors in a physiological signal monitoring device
US9615744B2 (en) 2007-01-31 2017-04-11 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
US9706957B2 (en) 2008-01-25 2017-07-18 Medtronic, Inc. Sleep stage detection
US9770204B2 (en) 2009-11-11 2017-09-26 Medtronic, Inc. Deep brain stimulation for sleep and movement disorders
US9788750B2 (en) 2007-04-30 2017-10-17 Medtronic, Inc. Seizure prediction
US9924904B2 (en) 2014-09-02 2018-03-27 Medtronic, Inc. Power-efficient chopper amplifier

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7622988B2 (en) 2007-01-31 2009-11-24 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
US7385443B1 (en) 2007-01-31 2008-06-10 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
WO2008094271A1 (en) * 2007-01-31 2008-08-07 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
WO2008094270A1 (en) * 2007-01-31 2008-08-07 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for wireless telemetry
WO2008094269A1 (en) * 2007-01-31 2008-08-07 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
US9615744B2 (en) 2007-01-31 2017-04-11 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
US7391257B1 (en) 2007-01-31 2008-06-24 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
US9197173B2 (en) 2007-01-31 2015-11-24 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for impedance measurement
CN101589548B (en) * 2007-01-31 2012-08-15 麦德托尼克公司 Chopper-stabilized instrumentation amplifier and method for impedance measurement
AU2007345667B2 (en) * 2007-01-31 2011-07-28 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
US7847628B2 (en) 2007-01-31 2010-12-07 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
US8265769B2 (en) 2007-01-31 2012-09-11 Medtronic, Inc. Chopper-stabilized instrumentation amplifier for wireless telemetry
US8354881B2 (en) 2007-01-31 2013-01-15 Medtronic, Inc. Chopper-stabilized instrumentation amplifier
CN101589549B (en) * 2007-01-31 2016-12-28 麦德托尼克公司 Chopper-stabilized instrumentation amplifier
US8594779B2 (en) 2007-04-30 2013-11-26 Medtronic, Inc. Seizure prediction
US8781595B2 (en) 2007-04-30 2014-07-15 Medtronic, Inc. Chopper mixer telemetry circuit
US9788750B2 (en) 2007-04-30 2017-10-17 Medtronic, Inc. Seizure prediction
US9449501B2 (en) 2007-04-30 2016-09-20 Medtronics, Inc. Chopper mixer telemetry circuit
US10258798B2 (en) 2007-09-26 2019-04-16 Medtronic, Inc. Patient directed therapy control
US7714757B2 (en) 2007-09-26 2010-05-11 Medtronic, Inc. Chopper-stabilized analog-to-digital converter
US9248288B2 (en) 2007-09-26 2016-02-02 Medtronic, Inc. Patient directed therapy control
US7623053B2 (en) 2007-09-26 2009-11-24 Medtronic, Inc. Implantable medical device with low power delta-sigma analog-to-digital converter
US8554325B2 (en) 2007-10-16 2013-10-08 Medtronic, Inc. Therapy control based on a patient movement state
US9706957B2 (en) 2008-01-25 2017-07-18 Medtronic, Inc. Sleep stage detection
US10165977B2 (en) 2008-01-25 2019-01-01 Medtronic, Inc. Sleep stage detection
US8478402B2 (en) 2008-10-31 2013-07-02 Medtronic, Inc. Determining intercardiac impedance
US9770204B2 (en) 2009-11-11 2017-09-26 Medtronic, Inc. Deep brain stimulation for sleep and movement disorders
US9521979B2 (en) 2013-03-15 2016-12-20 Medtronic, Inc. Control of spectral agressors in a physiological signal monitoring device
US9439150B2 (en) 2013-03-15 2016-09-06 Medtronic, Inc. Control of spectral agressors in a physiological signal montoring device
US9924904B2 (en) 2014-09-02 2018-03-27 Medtronic, Inc. Power-efficient chopper amplifier

Also Published As

Publication number Publication date
DE1911767A1 (en) 1969-10-09

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