A self-buffered DC baseline restorer with quasi-ideal behavior

Abstract

We present a DC baseline restorer featuring quasi-ideal behavior, capable of showing an undershoot of less than 0.023%. Its circuit structure allows using a single operational amplifier to realize both the buffering of the output signal, with line driving capability, and to discharge the decoupling capacitance. The operational amplifier in each working condition always remains in a closed-loop state, exploiting its full dynamic performance. The presented circuit allows the avoidance of an additional amplifying buffer stage, necessary, up to now, to drive a 50 Ω coaxial cable terminated at both ends.