Patent ID: 7102365
Filing Date: 2006-09-05
Classification: G01R

Abstract:
1. A circuit for sensing a current, the circuit comprising: a first switched capacitor network comprising a first set of capacitors, said first switched capacitor network having an output and having an input configured to sample each of first, second, and third reference potentials across a different capacitor of said first set of capacitors during each of two phases, said first and second reference potentials indicating the current; a second switched capacitor network comprising a second set of capacitors exclusive of said first set of capacitors, said second switched capacitor network having a first terminal coupled to said input of said amplifier and having a second terminal coupled to said output of said amplifier, said second switched capacitor network configured to cancel an offset voltage at said input of said amplifier; and an amplifier having an output and having an input coupled to said output of said first switched capacitor network, said amplifier configured to produce first and second amplified potentials at said output of said amplifier based on said first and second reference potentials.