Patent ID: 11942967
Assignee: SIGMASENSE, LLC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An analog to digital converter (ADC) comprising:
a capacitor that is operably coupled to a photo-diode and configured to produce a photo-diode voltage based on charging by a photo-diode current associated with the photo-diode and a digital to analog converter (DAC) source current;
a self-referenced latched comparator operably coupled to the photo-diode and the capacitor and configured to generate a first digital signal that is based on the photo-diode voltage and a threshold voltage associated with the self-referenced latched comparator;
an N-bit accumulator that is operably coupled to self-referenced latched comparator and configured to process the first digital signal to generate a second digital signal, wherein N is a positive integer;
an N-bit DAC that is operably coupled to the N-bit accumulator and configured to generate the DAC source current based on the second digital signal; and
a current sink that is operably coupled to the self-referenced latched comparator and configured to provide a path to sink current when the photo-diode current has a value of zero.