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.