Circuitry for measurement of electrochemical cells

Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising:

• measurement circuitry having a first input coupled to a first electrode of the electrochemical cell, the measurement circuitry configured to convert the analyte signal at the first electrode to a first analog output signal;
• a first analog-to-digital converter (ADC) having a first ADC input for receiving the first analog output signal, the first ADC configured to convert the first analog output signal to a first digital output signal at a first ADC output;
• a second ADC having a second ADC input, wherein the first ADC has a higher bandwidth than the second ADC;
• drive circuitry;
• and
• control circuitry,
• wherein the circuitry is operable in one or more of a calibration mode and a measurement mode,
• wherein, in the calibration mode, the drive circuitry is configured to apply a calibration signal at the first input of the measurement circuitry, the control circuitry configured to calibrate the measurement circuitry based on the first analog output signal or the first digital output signal responsive to the calibration signal, and
• wherein, in the measurement mode, the drive circuitry is configured to apply an offset signal at the first input of the measurement circuitry, the control circuitry configured to control the offset signal to maintain the first analog output signal or the first digital output signal within a threshold range.

Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising:

• measurement circuitry having a first input coupled to a first electrode of the electrochemical cell, the measurement circuitry configured to convert the analyte signal at the first electrode to a first analog output signal;
• a first analog-to-digital converter (ADC) having a first ADC input for receiving the first analog output signal, the first ADC configured to convert the first analog output signal to a first digital output signal at a first ADC output;
• drive circuitry;
• and
• control circuitry, wherein the circuitry is operable in one or more of a calibration mode and a measurement mode,
• wherein, in the calibration mode, the drive circuitry is configured to apply a calibration signal at the first input of the measurement circuitry, the control circuitry configured to calibrate the measurement circuitry based on the first analog output signal or the first digital output signal responsive to the calibration signal,
• wherein, in the measurement mode, the drive circuitry is configured to apply an offset signal at the first input of the measurement circuitry, the control circuitry configured to control the offset signal to maintain the first analog output signal or the first digital output signal within a threshold range, and
• wherein the calibration signal is swept over a range of amplitudes.

Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising:

• measurement circuitry having a first input coupled to a first electrode of the electrochemical cell, the measurement circuitry configured to convert the analyte signal at the first electrode to a first analog output signal;
• a first analog-to-digital converter (ADC) having a first ADC input for receiving the first analog output signal, the first ADC configured to convert the first analog output signal to a first digital output signal at a first ADC output;
• drive circuitry;
• and
• control circuitry, wherein the circuitry is operable in one or more of a calibration mode and a measurement mode,
• wherein, in the calibration mode, the drive circuitry is configured to apply a calibration signal at the first input of the measurement circuitry, the control circuitry configured to calibrate the measurement circuitry based on the first analog output signal or the first digital output signal responsive to the calibration signal,
• wherein, in the measurement mode, the drive circuitry is configured to apply an offset signal at the first input of the measurement circuitry, the control circuitry configured to control the offset signal to maintain the first analog output signal or the first digital output signal within a threshold range,
• wherein the drive circuitry comprises a digital-to-analog converter (DAC) having a DAC output coupled to the first input of the measurement circuitry, and
• wherein the control circuitry is configured to control the offset signal in response to the analog output signal exceeding the value of a least significant bit (LSB) of the DAC.

Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising:

• measurement circuitry having a first input coupled to a first electrode of the electrochemical cell, the measurement circuitry configured to convert the analyte signal at the first electrode to a first analog output signal;
• a first analog-to-digital converter (ADC) having a first ADC input for receiving the first analog output signal, the first ADC configured to convert the first analog output signal to a first digital output signal at a first ADC output;
• drive circuitry;
• and
• control circuitry, wherein the circuitry is operable in one or more of a calibration mode and a measurement mode,
• wherein, in the calibration mode, the drive circuitry is configured to apply a calibration signal at the first input of the measurement circuitry, the control circuitry configured to calibrate the measurement circuitry based on the first analog output signal or the first digital output signal responsive to the calibration signal,
• wherein, in the measurement mode, the drive circuitry is configured to apply an offset signal at the first input of the measurement circuitry, the control circuitry configured to control the offset signal to maintain the first analog output signal or the first digital output signal within a threshold range,
• wherein the drive circuitry comprises a digital-to-analog converter (DAC) having a DAC output coupled to the first input of the measurement circuitry,
• wherein the circuitry further comprises switching circuitry configured to selectively couple the first input of the measurement circuitry to the first electrode, the switching circuitry controllable by the control circuitry, and
• wherein the drive circuitry further comprises a guard amplifier having a guard amplifier output, wherein during the calibration mode the switching circuitry is controllable by the control circuitry to selectively couple the first electrode to the guard amplifier output.