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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: The answer is "it depends" posted by jj on May 18, 2001 at 14:22:09:
Thanks for this very theoretically well founded statement. As i can see your calculations go well for use in feedback less systems, to allow minimum the desired frequencies, as sine waves to get through.But what happens when you have a global feedback system, like an op-amp, would the slew rate of the amplifier not affect the feedback factor at higher frequencies?
The output continously tries to track the input signal, but the slew rate would probably be more or less proportional to the propagation delay in the op amp. This means that the output would track an input signal, with a delay of XX microseconds where XX gets higher for a lower slew rate amplifier.
I think the sonic properties of slew rate is VERY much: 'It depends'.
The simple answer is: Use a VERY high slew rate but Unity Gain stable op amp like the LM6172 (National) or AD825 (Analog Devices) and use a good bypassing scheme. Then you are sure to get the best performance.
Lars Clausen
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Follow Ups
- Re: The answer is "it depends" - LCAudio 08:11:09 05/20/01 (1)
- Um, no.... - jj 14:36:53 05/22/01 (0)
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