[sdiy] opamp protection resistors
David G. Dixon
dixon at interchange.ubc.ca
Wed Jun 9 01:30:09 CEST 2010
I'm layout out a 4P filter (2164-based, with VCAs and inverting
integrators), and I forgot to put the 1k resistors on all the outputs (there
are eight, and it will be a pain to retrofit them in). Here's the question:
Will it affect filter performance in any way if I simply slip 100R resistors
in between the opamp outputs and the feedback junctions of the integrators
(note: C = 200pF), and take the filter outputs directly from the feedback
junctions?
Simulation in NI Multisim suggests there will be no effect whatsoever.
However, I thought I'd ask the experts before committing this idea to the
layout.
Thanks in advance for all replies!
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