Self-correcting amplifier system

  • US 8,710,847 B2
  • Filed: 10/28/2011
  • Issued: 04/29/2014
  • Est. Priority Date: 10/28/2010
  • Status: Expired due to Fees
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First Claim
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1. A battery testing device to automatically compensate for DC offsets arising from the battery testing device, comprising:

  • an input terminal to receive an excitation response signal comprising a DC bias and an AC response;

    an op amp coupled to receive and to amplify the response signal, the op amp introducing internal errors manifested in the amplified response signal;

    a servo integrator coupled to receive the amplified response signal and to determine the DC bias and a rate of change of the amplified response signal, and in response, to produce a servo feedback signal to compensate for the DC bias;

    a correction circuitry, coupled to receive the servo feedback signal and to output a correction current to the op amp, and to produce the correction current in order to remove the DC bias;

    an error sensing device, coupled to receive the correction current and to output a feedback control signal, to adjust for the internal errors introduced by the correction circuitry; and

    an output terminal to output a corrected AC signal.

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