Patent ID: 8035438
Filing Date: 2011-10-11
Classification: H03F

Abstract:
1. An alternating-current (AC) coupling integrated circuit (IC) for suppressing signal errors introduced by a steady-state input, the AC-coupling IC comprising: an operational amplifier having an inverting signal input, a non-inverting signal input, and an output; a true direct-current (DC) bias network having a first branch and a second branch, the first branch and the second branch of the true DC-bias network coupled to each other and to the non-inverting signal input; a complimentary DC-bias network having a third branch and a fourth branch, the third branch and the fourth branch of the complimentary DC-bias network coupled to each other and to the inverting signal input; a first feedback element coupled to the output of the operational amplifier and arranged to generate a first control signal in response to a characteristic of a true input signal applied to the true DC-bias network and a complimentary input signal applied to the complimentary DC-bias network; and a second feedback element coupled to the output of the operational amplifier and arranged to generate a second control signal in response to a characteristic of the true input signal and the complimentary input signal.