US 12,431,082 B2
Sensing circuit with enhanced dynamic range and accuracy
Hasan Akyol, Los Altos, CA (US); and Xuebei Yang, Fremont, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 5, 2024, as Appl. No. 18/405,798.
Application 18/405,798 is a division of application No. 18/117,286, filed on Mar. 3, 2023, granted, now 11,900,879.
Application 18/117,286 is a continuation of application No. 17/686,227, filed on Mar. 3, 2022, granted, now 11,620,946, issued on Apr. 4, 2023.
Prior Publication US 2024/0161697 A1, May 16, 2024
Int. Cl. G09G 3/3233 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 2300/0819 (2013.01); G09G 2320/045 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating a sensing circuit, comprising:
receiving an input signal to be sensed using the sensing circuit;
coupling a first capacitor in parallel with a second capacitor, the second capacitor coupled to an input terminal and an output terminal of a differential amplifier of the sensing circuit;
measuring a differential output of the differential amplifier to obtain a first set of measurements after coupling the first capacitor in parallel with the second capacitor;
disconnecting the second capacitor from the first capacitor;
measuring the differential output of the differential amplifier to obtain a second set of measurements after disconnecting the second capacitor from the first capacitor; and
determining a characteristic of the input signal based on the first set of measurements and the second set of measurements.