US Patent 11043893 Bias regulation system

A bias circuit is provided. The bias circuit includes a comparator circuit configured to compare a first voltage at a first input with a second voltage at a second input and generate a digital value at an output. A level shifter circuit is coupled to the comparator circuit. The level shifter is configured to receive a reference voltage at an input and generate the second voltage at an output. A charge pump circuit is coupled to the comparator circuit. The charge pump circuit is configured to generate the first voltage at an output based on the digital value.