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Old 12th January 2020
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Brian M. Boykin's Avatar
 

When is a Feedback Loop Capacitor NOT Good Practice?

So in the world of swapping modern op amps into older designs I always add a .1uF cap from the +vcc and -vcc to ground and in recent years started adding a 33pf cap across the feedback resistor to further help with stabilization.

Questions:
1) Is there an instance when I should not add a feedback cap?
2) Knowing this cap can limit bandwidth, what kind of trouble can I get myself into from lowering a 100pf cap to 47pf or 33pf in an existing design to open up the bandwidth a little more?

As always,

Thanks in advance

Brian