I sketched out a VCVS high pass filter with a cutoff of a few hertz, and noticed that the input capacitor is 100nF. Will this cause problems for the circuit driving it, or does the feedback in a VCVS "hide" the capacitance and make the input impedance appear much stiffer?
I will be offline for a few days so I won't be able to answer questions. Basically, I was thinking of driving it from an op amp, the bandwidth of the circuit is about 200kHz but I want to chop off the stuff below 10Hz, and the C could be say 33nF rather than 100nF; but it's going to be a pretty large C here which rings warning bells to me. Perhaps there's another way to implement a HPF that doesn't involve having to drive into a large C?
Thanks in anticipation,
Nemo