[sdiy] Noninverting precision half-wave rectifier?

[cheater cheater]

Make one. It's not like it'll be loads of expensive components.

D.

On Sat, Sep 26, 2009 at 6:59 AM, David G. Dixon
<dixon at interchange.ubc.ca> wrote:
> Most of you are probably aware of the inverting precision half-wave
> rectifier (inverting opamp with two artfully placed diodes).  Well, I'm
> looking this old book "Handbook of Operational Amplifier Circuit Design",
> and it's also got a schematic of a NON-inverting precision half-wave
> rectifier (Fig. 16.6 on page 16-6).  It is basically the non-inverting
> analogue of the inverting rectifier.  I'm thinking, "Wow, this is great: an
> active rectifier with high input impedance which isn't severely slew-rate
> limited.  Why haven't the other books mentioned this great circuit?!?"
> However, when I simulate it in Multisim, it doesn't rectify.
>
> There isn't really any such thing, is there?  Only the crappy, severely
> slew-rate limited one-diode version which Horowitz and Hill warns us against
> (but which I've used on several occasions anyway).  The book is wrong.
>
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