US 12,451,896 B2
Circuitry for measurement of electrochemical cells
John P. Lesso, Edinburgh (GB); Ivan Perry, Penicuik (GB); Salvatore Caporale, Edinburgh (GB); Gagan Midha, Edinburgh (GB); and James Wells, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Aug. 23, 2023, as Appl. No. 18/454,435.
Claims priority of provisional application 63/491,987, filed on Mar. 24, 2023.
Prior Publication US 2024/0322834 A1, Sep. 26, 2024
Int. Cl. H03M 1/10 (2006.01); H01M 6/02 (2006.01); H01M 6/50 (2006.01); G01N 27/26 (2006.01)
CPC H03M 1/1009 (2013.01) [H01M 6/02 (2013.01); H01M 6/5044 (2013.01); H03M 1/1071 (2013.01); G01N 27/26 (2013.01)] 20 Claims
OG exemplary drawing
 
1. Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising:
measurement circuitry having a first measurement input coupled to a first electrode of the electrochemical cell, the measurement circuitry configured to convert the analyte signal at the first measurement input to a first analog output signal;
an analog-to-digital converter (ADC) having an first ADC input for receiving the first analog output signal, the ADC configured to convert the first analog output signal to a first digital output signal at an ADC output;
compensation circuitry configured in a measurement mode to:
apply a first compensation to the first digital output signal to obtain a first compensated digital output signal, the first compensation to compensate for non-linearity in the ADC; and
apply a second compensation to the first compensated digital output signal to obtain a second compensated digital output signal, the second compensation to compensate for non-linearity in the measurement circuitry;
control circuitry configured in a calibration mode to:
apply a first calibration signal at the first ADC input and adapt the first compensation based on the first calibration signal and the first compensated digital output signal; and
apply a second calibration signal at the first electrode and adapt the second compensation based on the second calibration signal and the second compensated digital output signal.