Patent ID: 11965847
Assignee: NXP B.V.
Field: Measurement (Instruments)
Classification: CPC G  A | IPC G

Claim 20:
21. An analog front end for an electrochemical sensor comprising:
an electrode driver stage coupled to electrodes of an electrochemical sensor; and
measurement channels coupled to the electrode driver stage to receive an electrode signal from the electrodes of the electrochemical sensor and to generate measurement results, the measurement channels configured to switch configurations to perform different measurements;
wherein the measurement channels comprise an ADC to generate a measurement result, the ADCs being in a form of a continuous time Sigma Delta ADC with a current input;
a down mixer coupled to a WE buffer and to an alternating current applied at the WE buffer, and
an input multiplexer between the down mixer and the WE buffer,
the input multiplexer being reconfigurable to down mix a WE output current with the alternating current to generate a current related to the WE output current,
the down mixer being coupled to the ADC to convert the current to a digital form.