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CURRENT COUNTING ANALOG-TO-DIGITAL CONVERTER FOR LOAD CURRENT SENSING INCLUDING DYNAMICALLY BIASED COMPARATOR

  • US 20160013804A1
  • Filed: 07/11/2014
  • Published: 01/14/2016
  • Est. Priority Date: 07/11/2014
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • a first capacitor configured to receive a sense current in a first mode;

    a second capacitor configured to receive a sense current in a second mode;

    a comparator coupled to the first capacitor to compare a voltage of the first capacitor to a reference voltage and generate a count signal in response to the voltage of the first capacitor reaching the reference voltage in the first mode and coupled to the second capacitor to compare a voltage of the second capacitor to the reference voltage and generate the count signal in response to the voltage of the second capacitor reaching the reference voltage in the second mode;

    a reset circuit to discharge the first capacitor in the second mode and to discharge the second capacitor in the first mode in response to the count signal; and

    a counter incrementing a count of a number of occurrences of the count signal.

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