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Old 9th June 2010, 06:40 AM   #1
gary h is offline gary h  United States
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Default op amp slew rate question

Hi all,

I was recently told not to use sockets to mount "fast" opamps.

I am building a crossover using opa2134s. Is this a fast opamp? And if I may, is it slew rate that defines how fast an op amp, and what is the value?

thanks,

gary
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Old 9th June 2010, 06:58 AM   #2
Mooly is offline Mooly  United Kingdom
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Sockets take the power pins on the IC that little bit further away from any on board decoupling, and add a little inductance and resistance along the way.

So good practice is to add a small cap in the 0.01 to 0.1 range directly soldered on to the IC to maintain a low impedance path at HF. Do that and you won't have problems.

The OPA2134 is a "fast" opamp for audio, but it's all relative. There are far "faster" device around.

The GBW (gain/bandwidth figure) and slew rate are related for voltage feedback devices such as here.

Gain-bandwidth product - Wikipedia, the free encyclopedia
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Old 9th June 2010, 07:13 AM   #3
gary h is offline gary h  United States
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thanks.

gary
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