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System and method for low distortion capacitive signal source amplifier

  • US 9,236,837 B2
  • Filed: 08/25/2011
  • Issued: 01/12/2016
  • Est. Priority Date: 08/25/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • amplifying a signal provided by a capacitive signal source to form an amplified signal;

    detecting a peak voltage of a portion of the amplified signal having a frequency higher than a lower corner frequency;

    adjusting a controllable impedance of an attenuator coupled to an output of the capacitive signal source in response to detecting the peak voltage of the portion of the amplified signal having the frequency higher than the lower corner frequency, the controllable impedance being adjusted to a value inversely proportional to the detected peak voltage; and

    comparing the detected peak voltage to a predetermined threshold, wherein adjusting the controllable impedance comprisesdecreasing the controllable impedance at a first rate if the detected peak voltage exceeds the predetermined threshold,increasing the controllable impedance at a second rate if detected peak voltage does not exceed the predetermined threshold, wherein the first rate is greater than the second rate.

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