WO2018069338A1 - Rauscharmes signalfilter - Google Patents

Rauscharmes signalfilter Download PDF

Info

Publication number
WO2018069338A1
WO2018069338A1 PCT/EP2017/075839 EP2017075839W WO2018069338A1 WO 2018069338 A1 WO2018069338 A1 WO 2018069338A1 EP 2017075839 W EP2017075839 W EP 2017075839W WO 2018069338 A1 WO2018069338 A1 WO 2018069338A1
Authority
WO
WIPO (PCT)
Prior art keywords
input
output
circuit
transconductance amplifier
current integrator
Prior art date
Application number
PCT/EP2017/075839
Other languages
German (de)
English (en)
French (fr)
Inventor
Christian Feucht
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018069338A1 publication Critical patent/WO2018069338A1/de

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
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/129—Indexing scheme relating to amplifiers there being a feedback over the complete amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/135—Indexing scheme relating to amplifiers there being a feedback over one or more internal stages in the global amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/156—One or more switches are realised in the feedback circuit of the amplifier stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/264—An operational amplifier based integrator or transistor based integrator being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/267—A capacitor based passive circuit, e.g. filter, being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/372—Noise reduction and elimination in amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/375—Circuitry to compensate the offset being present in an amplifier

Definitions

  • the invention relates to a signal filter in SC technology with a transconductance amplifier, a current integrator and a clocked attenuator circuit.
  • the BMA255 acceleration sensor from Bosch Sensortec has a seismic mass whose acceleration is determined by means of a differential capacitor.
  • an input circuit of the acceleration sensor to the variable capacitance of the differential capacitor is determined with a charge amplifier in SC technology.
  • the invention relates to a signal filter in SC technology with a transconductance amplifier, a current integrator and a clocked attenuator circuit, wherein a switchable input of the circuit is connected to an input of the transconductance amplifier, wherein an output of the transconductance amplifier is connected to a switchable input of the current integrator an output of the current integrator with an output the circuit is connected, wherein the output of the current integrator is fed back by means of the clocked attenuator circuit on the input of the transconductance amplifier.
  • Transconductance amplifier is connected to the switchable input of the current integrator by means of a, connected in series, further capacitive Abschw kauers.
  • An advantageous embodiment of the invention provides that the filter has a charge input and that a capacitor Cin, which is connected to the switchable input of the circuit and the input of the transconductance amplifier, part of signal supplying
  • the circuit according to the invention avoids the effect of noise folding, so that, in particular at high amplification factors at the same power loss, a substantially lower
  • z. B. directly evaluate the signals from resistive or capacitive sensors without requiring a special amplifier stage in front of the filter.
  • the advantage is lower noise in the output signal given the gain and given power consumption.
  • FIG. 1 shows schematically a low-noise signal filter according to the invention. description
  • FIG. 1 shows schematically a low-noise signal filter according to the invention. Shown is a signal filter in SC technology with a transconductance amplifier 100, a current integrator 200 and a clocked attenuator circuit 300.
  • a switchable input 10 of the circuit according to the invention is connected to an input 110 of the transconductance amplifier 100.
  • An output 120 of the transconductance amplifier 100 is connected to a switchable input 210 of the current integrator 200.
  • An output 220 of the current integrator 200 is connected to an output 20 of the circuit according to the invention. According to the invention, the output 220 of the current integrator 200 is by means of the clocked operating
  • Attenuator circuit 300 is fed back to the input 110 of the transconductance amplifier 100.
  • the clocked attenuator 300 has a case
  • the clocked attenuator 300 has a capacitive attenuator 320.
  • the circuit according to the invention thus consists of a transconductance amplifier and a current integrator. This combination is fed back by a clocked attenuator circuit to provide the desired filter characteristics, including a
  • Transconductance stage and integrator are used to obtain a further degree of freedom in terms of the transfer function of the filter and noise.
  • the further capacitive attenuator is connected to the output 120 of the transconductance amplifier and to the input 210 of the current integrator.
  • the transconductance stage has a current output, so that at this point the output signal of another amplifier can be fed without any special effort, the z. B. can be used to compensate for the offset voltage of the transconductance stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
PCT/EP2017/075839 2016-10-10 2017-10-10 Rauscharmes signalfilter WO2018069338A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016219610.3 2016-10-10
DE102016219610.3A DE102016219610A1 (de) 2016-10-10 2016-10-10 Rauscharmes Signalfilter

Publications (1)

Publication Number Publication Date
WO2018069338A1 true WO2018069338A1 (de) 2018-04-19

Family

ID=60080802

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/075839 WO2018069338A1 (de) 2016-10-10 2017-10-10 Rauscharmes signalfilter

Country Status (3)

Country Link
DE (1) DE102016219610A1 (zh)
TW (1) TW201815063A (zh)
WO (1) WO2018069338A1 (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020027453A1 (en) * 2000-09-07 2002-03-07 Kulhalli Suhas R. Amplifying signals in switched capacitor environments
US20050110669A1 (en) * 2003-11-26 2005-05-26 Texas Instruments Incorporated High Speed Gain Amplifier and Method in ADCs
US20070007438A1 (en) * 2005-07-06 2007-01-11 Liu Xinqiao Chiao Imaging array having variable conversion gain

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084639A (en) * 1990-09-17 1992-01-28 General Electric Company Low frequency noise canceling photodetector preamplifier useful for computerized tomography
GB2256551B (en) * 1991-06-06 1996-01-24 Crystal Semiconductor Corp Switched capacitor integrator with chopper stabilisation performed at the sampling rate
US5847600A (en) * 1996-04-26 1998-12-08 Analog Devices, Inc. Multi-stage high-gain high-speed amplifier
WO2016083288A1 (de) * 2014-11-28 2016-06-02 Elmos Semiconductor Aktiengesellschaft Sc-verstärkerschaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020027453A1 (en) * 2000-09-07 2002-03-07 Kulhalli Suhas R. Amplifying signals in switched capacitor environments
US20050110669A1 (en) * 2003-11-26 2005-05-26 Texas Instruments Incorporated High Speed Gain Amplifier and Method in ADCs
US20070007438A1 (en) * 2005-07-06 2007-01-11 Liu Xinqiao Chiao Imaging array having variable conversion gain

Also Published As

Publication number Publication date
TW201815063A (zh) 2018-04-16
DE102016219610A1 (de) 2018-04-12

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