Patent ID: 11867557
Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
Field: Medical technology (Instruments)
Classification: CPC G  A | IPC G

Claim 0:
1. An optical front end for mitigating signals from ambient light comprising:
a differential amplifier having a first input and a second input and an output;
a photodetector in electrical communication with the first input of the differential amplifier;
a current digital to analog converter in electrical communication with the first input of the differential amplifier; and
a voltage source in electrical communication with the second input of the differential amplifier;
wherein the current digital to analog converter is configured to produce a compensation current which is substantially equal and opposite to a current produced by the photodetector, and
wherein the compensation current is determined based at least on a previous sampling of the output of the differential amplifier in a dark state and a previous compensation current.