US 12,253,487 B2
Circuitry for analyte measurement
John Paul Lesso, Edinburgh (GB); and Toru Ido, Tokyo (JP)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Appl. No. 18/685,979
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
PCT Filed Aug. 25, 2022, PCT No. PCT/GB2022/052184
§ 371(c)(1), (2) Date Feb. 23, 2024,
PCT Pub. No. WO2023/031582, PCT Pub. Date Mar. 9, 2023.
Application 18/685,979 is a continuation of application No. 17/463,796, filed on Sep. 1, 2021, granted, now 11,846,600, issued on Dec. 19, 2023.
Prior Publication US 2024/0264112 A1, Aug. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 27/327 (2006.01); G01R 19/165 (2006.01)
CPC G01N 27/3273 (2013.01) [G01R 19/165 (2013.01); G01R 19/16566 (2013.01)] 28 Claims
OG exemplary drawing
 
1. Circuitry for measuring a characteristic of an electrochemical cell, the circuitry comprising:
a hysteretic comparator having a first comparator input, a second comparator input and a comparator output;
a feedback path between the comparator output and the second comparator input configured to provide a feedback signal to the second comparator input;
a loop filter configured to apply filtering to the feedback path to generate the feedback signal, wherein the loop filter comprises the electrochemical cell; and
control circuitry configured to adapt a hysteresis of the comparator based on a limit cycle frequency or limit cycle period of a comparator output signal derived from the comparator output.