Circuitry for measurement of electrochemical cells
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn P. LESSO, Toru IDO
Life of this patent
Estimating the term…
Abstract
Circuitry for characterising an electrochemical cell having a first electrode, a second electrode and a non-linear response characteristic, the circuitry comprising: difference circuitry configured to measure a potential difference across the electrochemical cell and output a difference voltage proportional to the measured potential difference; compensation circuitry configured to linearise the difference voltage and output a linearised difference signal; and a first analog-to-digital converter (ADC) configured to convert the linearised difference signal to a digital output.
Claims34
Circuitry for characterising an electrochemical cell having a first electrode, a second electrode and a non-linear response characteristic, the circuitry comprising:
- difference circuitry configured to measure a potential difference across the electrochemical cell and output a difference voltage proportional to the measured potential difference;
- compensation circuitry configured to linearise the difference voltage and output a linearised difference signal;
- and
- a first analog-to-digital converter (ADC) configured to convert the linearised difference signal to a digital output.
(canceled)
9-10. (canceled)
13-14. (canceled)
Circuitry for processing a signal from a sensor having a non-linear response characteristic, the circuitry comprising:
- an analog-to-digital converter (ADC) comprising:
- an ADC input;
- an ADC output;
- and
- a feedback path between the ADC input and the ADC output, the feedback path comprising a digital to analog converter (DAC);
- and
- a non-linear circuit element coupled between the feedback path and a reference voltage, the non-linear circuit element configured to compensate for the non-linear response characteristic of the sensor.
(canceled)
(canceled)
Circuitry for characterising an electrochemical cell having a first electrode and a second electrode, the circuitry comprising:
- a first hysteretic comparator having a first comparator input for coupling to the first electrode, a second comparator input and a first comparator output for outputting a first digital output signal;
- a first feedback path between the first comparator output and the second comparator input, the first feedback path comprising a first loop filter configured to apply filtering to the first feedback path;
- a second hysteretic comparator having a third comparator input for coupling to the second electrode, a fourth comparator input and a second comparator output for outputting a second digital output signal;
- a second feedback path between the second comparator output and the further comparator input, the first feedback path comprising a second loop filter configured to apply filtering to the second feedback path;
- and
- processing circuitry configured to process the first and second digital output signals.
(canceled)
(canceled)
Circuitry for characterising an electrochemical cell having a first electrode and a second electrode, the circuitry comprising:
- a dual differential amplifier, comprising:
- a first non-inverting input for coupling to the first electrode;
- a first inverting input for coupling to the second electrode;
- a second non-inverting input;
- a second inverting input coupled to a reference voltage;
- and
- an amplifier output;
- a feedback path between the amplifier output and the second non-inverting input, the feedback path comprising a loop filter configured to apply filtering to the feedback path.
(canceled)
Circuitry for characterising an electrochemical cell having a first electrode, a second electrode and a non-linear response characteristic, the circuitry comprising:
- a first pulse-width modulated (PWM) ADC having a first input coupled to the first electrode and an output configured the output a first time encoded signal encoded based on a first voltage at the first electrode;
- a second pulse-width modulated (PWM) ADC having a first input coupled to the second electrode and an output configured the output a second time encoded signal encoded based on a second voltage at the second electrode;
- and
- difference circuitry configured to output digital output signal representing a difference between the first time encoded signal and the second time encoded signal.
Circuitry for characterising an electrochemical cell having a first electrode, a second electrode and a non-linear response characteristic, the circuitry comprising:
- a first programmable gain amplifier (PGA) having a first input coupled to the first electrode and an output;
- a second programmable gain amplifier (PGA) having a second input coupled to the second electrode and an output;
- and
- a differential amplifier having a first differential input coupled to the output of the first PGA, a second differential input coupled to the output of the second PGA, a digital output, the differential amplifier configured to output a digital output signal representing a difference between the first and second differential inputs.
34-35. (canceled)
37-38. (canceled)
Dependencies are inferred from the claim text.