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Dynamic compensation of analog-to-digital converter (ADC) offset errors using filtered PWM

  • US 20050134488A1
  • Filed: 12/17/2003
  • Published: 06/23/2005
  • Est. Priority Date: 12/17/2003
  • Status: Active Grant
First Claim
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1. A system for providing dynamic compensation of analog-to-digital converter offset errors, comprising:

  • an Analog-to-Digital Converter (ADC) having an analog input, a digital output, and at least one reference voltage input;

    a waveform generator operative to produce at least one output signal having Pulse-Width Modulated (PWM) waveform characteristics, the output signal having at least one predetermined PWM waveform characteristic;

    a low pass filter configured to receive the output signal having PWM waveform characteristics, to produce a corresponding DC output signal, and to provide the DC output signal to the reference voltage input of the ADC; and

    a processor operative to detect a voltage offset at the ADC digital output, and to control the predetermined characteristic of the output signal based on the detected offset, thereby dynamically compensating for ADC offset errors.

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