Patent ID: 8692625

Claim:
An oscillator, comprising: a first capacitor electrically connected to a first charging switch and a first discharging switch; a second capacitor electrically connected to a second charging switch and a second discharging switch; a first chopping circuit having a first input electrically connected to the first capacitor and a second input electrically connected to a reference voltage, the first chopping circuit including a switching network that connects its first input to its first output and its second input to its second output when a first chop control signal is at a first state, and connects its first input to its second output and its second input to its first output when the first chop control signal is at a second state; a second chopping circuit having a first input electrically connected to the second capacitor and a second input electrically connected to the reference voltage; a first comparator having a first input and second input electrically connected to a first and second output of the first chopping circuit; a second comparator having a first input and second input electrically connected to a first and second output of the second chopping circuit; and control circuitry having a first input electrically coupled to an output of the first comparator and a second input electrically connected to an output of the second comparator.