US 12,007,358 B2
Potentiostat with offset calibration
Moez Kanoun, Waterloo (CA)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Sep. 17, 2020, as Appl. No. 16/948,409.
Claims priority of provisional application 62/979,692, filed on Feb. 21, 2020.
Prior Publication US 2021/0262977 A1, Aug. 26, 2021
Int. Cl. G01N 27/49 (2006.01); G01N 27/416 (2006.01); G01N 27/417 (2006.01); H03F 3/347 (2006.01)
CPC G01N 27/4175 (2013.01) [G01N 27/4163 (2013.01); H03F 3/347 (2013.01); H03F 2200/129 (2013.01); H03F 2200/375 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for measuring a work electrode current, the method comprising:
generating, using a potentiostat coupled to a work electrode, a first output current, the first output current including a work electrode current component and an offset current component, the offset current component generated by an offset current source of the potentiostat;
converting the first output current to a first digital word;
modifying the first digital word using a calibration factor stored in a memory to obtain a measurement of the work electrode current;
detecting a calibration event; and
performing a calibration to measure the offset current component by:
reconfiguring the potentiostat for the calibration;
generating, using the reconfigured potentiostat, a second output current, the second output current being a measurement of the offset current component;
converting the second output current to a second digital word; and
updating the calibration factor stored in the memory according to the second digital word.