Patent ID: 8421519

Claim:
A system, comprising: a switched charge storage element integrator, the integrator including: a first input terminal configured to receive a reference voltage; a second input terminal configured to receive a first analog input signal; a third input terminal configured to receive a second analog input voltage; a differential input amplifier having a non-inverting input terminal and an inverting input terminal that is continuously electrically coupled to the second input terminal to receive the first analog input signal; a first switched charge storage element block having first and second terminals; a first coupling circuit configured to periodically electrically couple the inverting terminal of the differential input amplifier to the first terminal of the first switched charge storage element block and the second terminal of the first switched charge storage element to the first input terminal; a second switched charge storage element block having first and second terminals; and a second coupling circuit configured to periodically electrically couple the inverting terminal of the differential input amplifier to the first terminal of the second switched charge storage element block and the second terminal of the second switched charge storage element block to the third input terminal, the first and second coupling circuits configured so that whenever the first switched charge storage element block is electrically decoupled from the inverting terminal of the differential input amplifier and the first input terminal, the second switched charge storage element block is electrically coupled to the inverting terminal of the differential input amplifier and the third input terminal, and whenever the first switched charge storage element block is electrically coupled to the inverting terminal of the differential input amplifier and the first input terminal, the second switched charge storage element block is electrically decoupled from the inverting terminal of the differential input amplifier and the third input terminal.