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“驯服”振荡运算放大器

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“驯服”振荡运算放大器


Taming the Oscillating Op Amp
Bruce Trump
Last week we looked at two very common reasons for oscillations or
instability in op amp circuits. The ultimate cause of both was delay or
phase shift in the feedback path. Review it here. I confess that I had
intended to discuss cures for both circuits this week. But to keep these
blogs bite-size, I think it’s best to cover just one this week. (I must
control my enthusiasm!)
A simple non-inverting amplifier can be unstable or have excessive
overshoot and ringing if the phase shift or delay created by the op amp’s
input capacitance (plus some stray capacitance) reacting with the feedback
network resistance is too great. You may be able to make some improvement
by reducing stray capacitance at this no……
“驯服”振荡运算放大器
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