US 11,933,823 B1
Methods and apparatus to compare voltages
Veeramanikandan Raju, Bangalore (IN); Anand Kumar G, Bangalore (IN); and Aravindhan Karuppiah, Bangalore (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Oct. 7, 2022, as Appl. No. 17/962,139.
Int. Cl. G01R 19/10 (2006.01); G01R 19/165 (2006.01); G01R 19/25 (2006.01)
CPC G01R 19/10 (2013.01) [G01R 19/16576 (2013.01); G01R 19/2506 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device to compare voltages, the device comprising:
analog comparator circuitry having a first input configured to couple to an input voltage and a second input configured to couple to a reference voltage, the analog comparator circuitry configured to output a digital value corresponding to a difference between the input voltage and the reference voltage;
output sampler circuitry configured to:
produce a plurality of samples of the difference; and
count a number of the plurality of samples in which the input voltage is greater than the reference voltage; and
reference adaption circuitry configured to:
determine, based on the count, whether to adjust the reference voltage;
responsive to a determination to adjust the reference voltage, determine, based on the count, an amount of adjustment; and
responsive to a determination not to adjust the reference voltage, provide an indication of the reference voltage to processor circuitry.