Patent ID: 7315200

Claim:
A method for driving the input of an integrator in a delta-sigma converter having an amplifier with a non-inverting input, an output and a positive input connected to a reference voltage and an integration capacitor connected between the non-inverting input and the output, comprising the steps of: sampling an input voltage at a first sampling rate onto an input sampling capacitor at a first point in time; dumping charge from the input sampling capacitor to the non-inverting input of the amplifier at a second point in time and at the first sampling rate; sampling a reference voltage onto a feedback sampling capacitor at substantially the first sampling rate; dumping charge stored on the feedback sampling capacitor to the non-inverting input of the amplifier at a second sampling rate different than the first sampling rate; and controlling the amount of time that charge is dumped from the feedback sampling capacitor to be substantially equal to the amount of time that charge is being dumped from the input sampling capacitor; wherein varying the second sampling rate relative to the first sampling rate changes the gain of delta-sigma converter.