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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: By-pass caps for op-amp solutions posted by Gakere on March 26, 2005 at 16:56:01:
Going common mode, + to - is asking for problems. The regulators may start to oscillate.The bypass caps should go where the current comes from, ±V to ground. Most applications will do best with a 0.1µF and a 10µF combination.
Ideally, the ground should actually be where the current is consumed (the load presented by the next stage). As this may not be near the opamp it may not always be possible.
If you have a poor layout on your board, it may oscillate with a stupidly-fast opamp it was never designed for. Try a low value resistor in series with the 0.1µF cap, 4.7~10 ohms surface mount type.
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Follow Ups
- Re: By-pass caps for op-amp solutions - djk 19:34:15 03/26/05 (0)
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