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Apparatus and methods for removing a large-signal voltage offset from a biomedical signal

  • US 10,686,715 B2
  • Filed: 11/19/2018
  • Issued: 06/16/2020
  • Est. Priority Date: 05/09/2018
  • Status: Active Grant
First Claim
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1. A method of removing a voltage offset from a biomedical signal, comprising:

  • receiving the biomedical signal at a differential input of an operational amplifier;

    amplifying, by the operational amplifier, the voltage offset of the biomedical signal by a gain;

    monitoring an amplitude of the voltage offset of the received biomedical signal using a first pair of diode stages coupled to a differential output of the operational amplifier; and

    in response to the amplitude of the voltage offset being greater than an activation threshold for a duration of at least a time period, wherein the time period is based on a plurality of timing banks coupled to the first pair of diode stages;

    limiting charging, by the first pair of diode stages, of a plurality of timing banks from the biomedical signal;

    producing, by the plurality of timing banks, a differential signal;

    charging a resistor-capacitor network of the plurality of timing banks;

    setting, by the plurality of timing banks, the duration of the time period based on the charging of the resistor-capacitor network;

    limiting, by a second pair of diode stages, the differential signal from the plurality of timing banks;

    limiting a saturation duration, by the second pair of diode stages, of the differential signal to less than a saturation recovery time; and

    attenuating the amplitude of the voltage offset by pulling an output voltage of the second pair of diode stages toward a common mode reference voltage at a common mode node coupled to the plurality of timing banks.

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