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In Reply to: Re: Quiet, please..... posted by Allen Wright on October 18, 2006 at 13:09:24:
Allen, the opamps we use are selected in order to meet several criteria. Not all of those issues will be relevant to the work you do. For example, our standard +15V design will regulate to about 1A with less than 1.2V headroom. In other words, the incoming (single supply) voltage can drop as low as +16.2V without losing regulation. That requires an error amplifier capable of swinging its output very close to the positive rail.The AD797 is a really quiet amp, but not entirely suited to our use. As a result, I have no personal experience with it. I will say that its noise spec is close to our measurement floor (about 0.7 nV), and that says a lot for this amp. I think that as long as you can tame its relatively high G/B product, it should work quite well.
About reference noise, I don't recall the residual that's being delivered to the error amp. I'll try to find time tomorrow or Friday to measure it in a working regulator. It's possible this might limit the usefulness of an amp like the AD797, but I don't really know. We use a relatively simple R/C to quiet the reference.
Incidentally, we're actually an RF company. Our Vregs are designed in-house primarily to power the many ultra-low noise oscillators, amplifiers and synthesizers that we manufacture. This stuff is so much quieter than vacuum tubes, I have to regear my thinking several times a day. :)
TK
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Follow Ups
- Re: Quiet, please..... - Triode_Kingdom 20:08:58 10/18/06 (0)
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