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

We present a DC baseline restorer featuring quasi-ideal behavior, capable o f showing an undershoot of less than 0.023%. Its circuit structure allows u sing a single operational amplifier to realize both the buffering of the ou tput signal, with line driving capability, and to discharge the decoupling capacitance. The operational amplifier in each working condition always rem ains in a closed-loop state, exploiting its full dynamic performance. The p resented circuit allows the avoidance of an additional amplifying buffer st age, necessary, up to now, to drive a 50 Omega coaxial cable terminated at both ends. (C) 1999 Elsevier Science B.V. All rights reserved.