US 12,381,569 B2
Current-mode analog-to-digital converter systems, devices and methods for multi-sensing
Andriy Maharyta, Lviv (UA); Oleksandr Karpin, Lviv (UA); Paul Walsh, Cork (IE); and Mark Healy, County Cork (IE)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on May 7, 2021, as Appl. No. 17/314,998.
Prior Publication US 2022/0360275 A1, Nov. 10, 2022
Int. Cl. H03M 1/34 (2006.01); G01D 5/14 (2006.01); G01R 17/02 (2006.01)
CPC H03M 1/34 (2013.01) [G01D 5/14 (2013.01); G01R 17/02 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method, comprising:
configuring switch control circuits to generate a plurality of switch control signals based on configuration data in response to an output of an analog comparator circuit and a modulation clock signal;
configuring a plurality of first analog switches of a program balance current generator to modulate at least one balance current based on at least a first control signal and a second control signal of the plurality of switch control signals, wherein the first control signal and the second control signal have duty cycles that do not overlap;
configuring a second analog switch of the program balance current generator to couple the plurality of first analog switches to a first input of the analog comparator circuit based on a third control signal of the plurality of switch control signals, wherein the second analog switch is configured to modulate a sensor current received at the first input of the analog comparator circuit;
offsetting, responsive to a determination that a voltage at the first input of the analog comparator circuit meets a voltage threshold, the sensor current with the balance current; and
generating a multi-bit digital value from at least a bit stream output by the analog comparator circuit corresponding to the sensor current.