Patent ID: 6433712
Filing Date: 2002-08-13
Classification: H03M

Abstract:
An analog-to-digital converter receiving an analog input signal including an offset component, the analog-to-digital converter comprising:(a) a switched capacitor input circuit configured to sample the analog input signal to produce and store a signal representative of the sampled input signal between a first conductor and a second conductor; (b) a conversion circuit coupled to the first conductor and the switched capacitor input circuit and configured to produce a digital output signal representative of the analog input signal; (c) an offset correction circuit having an output coupled to the second conductor and an input receiving a digital offset correction signal, the offset correction circuit including a switched capacitor correction circuit operative in response to the offset correction control signal to transfer charge to/from the second conductor; (d) the conversion circuit being operative in response to adjustment by the offset correction circuit of a signal conducted by the first conductor to produce the digital output signal compensated for the offset component.