[sdiy] Noninverting precision half-wave rectifier?

[Neil Johnson]

David,

It seems like you don't have a copy of Walt Jung's "IC Op-Amp  
Cookbook".  The section on precision diodes (page 225 in my third  
edition) explains a lot more.

Cheers,
Neil

On 26 Sep 2009, at 06:59, David G. Dixon 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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