Hi Steven,

for very highbandwidth, try to minimize the number of parasitic poles. Single-stage structures are most adequate for this. Especially folded-cascode amplifiers provide relatively high gain with a convenient gain-bandwidth product. Also check slew-rate performance, as it may limit the speed of your S&H structure.

Paul

Steven,

the telescopic structure has only half the power consumption than the folded cascode topology (due to the absence of the folded branches), but it has a lower signal swing, both at the input and the output. I think telescopic structures are less frequently used in advanced technologies due to reduced supply voltages.

Paul