Buffering low capacitance sensors (<50 pF)
- From: "Johan van Hespen" <vlipje@xxxxxxxxxxx>
- Date: 30 Mar 2006 04:42:38 -0800
I need ideas for buffering a low capacitance sensor (<50pF). I'm now
using high speed opamps like MAX4102, CLC45 etc. in a non-inverting
configuration. The problem is the input biasing. The feedback loop of
this circuit is low-impedance (<1k) so for good biasing the non
invering input the impedance should be of the same order. I can not do
that because the lower cutoff f goes up.
So I need a high input impedance. I need suggestions for alternative
circuits.
.
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