Differential input interface circuit and method for adjusting DC levels of differential input signals

摘要

A differential input interface circuit includes a reference level generation stage generating a DC level that coincides with the DC level within the system; capacitors for cutting-off the DC level of the differential input signals; resistors for matching the average of the non-inverting phase signal and the inverting phase signal of the differential input signals from which the DC levels have been cut-off on the output DC level generated by the reference level generation stage. Thus, a differential input interface circuit make it possible to match the DC level of differential inputs to the DC level within a system which is responsive to the differential inputs.