Supply-noise-rejecting current source

Wessendorf, Kurt O.

Title: Supply-noise-rejecting current source

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Abstract

Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed-back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and cause the output of the current source to remain substantially constant.

Inventors:: Wessendorf, Kurt O.

Issue Date:: 2020-02-18

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1632584

Patent Number(s):: 10566936

Application Number:: 16/016,818

Assignee:: National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)

Patent Classifications (CPCs):: G - PHYSICS G05 - CONTROLLING G05F - SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS

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G - PHYSICS G05 - CONTROLLING G05F - SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
G05F1/561 - {Voltage to current converters
G05F3/262 - {using field-effect transistors only}

H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS
H03F3/345 - with field-effect devices
H03F1/301 - {in MOSFET amplifiers
H03F1/308 - {using MOSFET}
H03F2200/91 - the amplifier has a current mode topology
H03F3/45475 - {using IC blocks as the active amplifying circuit}

G - PHYSICS G05 - CONTROLLING G05F - SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
G05F1/467 - {Sources with noise compensation}

H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS
H03F2203/45526 - the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC

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DOE Contract Number:: NA0003525

Resource Type:: Patent

Resource Relation:: Patent File Date: 06/25/2018

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

Citation Formats


                    Wessendorf, Kurt O. Supply-noise-rejecting current source.  United States: N. p., 2020. 
        Web.

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                    Wessendorf, Kurt O. Supply-noise-rejecting current source.  United States.

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                    Wessendorf, Kurt O. Tue .  
        "Supply-noise-rejecting current source".  United States.  https://www.osti.gov/servlets/purl/1632584.

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@article{osti_1632584,

  title        = {Supply-noise-rejecting current source},

  author       = {Wessendorf, Kurt O.},

  abstractNote = {Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed-back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and cause the output of the current source to remain substantially constant.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2020},

  month        = {2}

}

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Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and causemore » « less
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