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HIGHLY ACCURATE SYNCHRONIZED CHARGE PUMP FOR CAPACITIVE TOUCH SCREEN SYSTEM

  • US 20200133411A1
  • Filed: 10/29/2018
  • Published: 04/30/2020
  • Est. Priority Date: 10/29/2018
  • Status: Active Grant
First Claim
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1. A touch screen controller, comprising:

  • a driver circuit configured to apply a drive signal to a drive line of a capacitive touch sensing panel, the driver circuit being powered by an accurate supply voltage; and

    a driver supply circuit configured to receive an input supply voltage and output the accurate supply voltage, the driver supply circuit comprising;

    a clocked comparator configured to compare a divided version of the accurate supply voltage to a reference voltage and to output a comparison signal based thereupon; and

    a voltage control circuit configured to generate the accurate supply voltage in response to the comparison signal;

    wherein the clocked comparator and voltage control circuit are both clocked by a driver supply circuit clock.

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