[sdiy] Noninverting precision half-wave rectifier?

David G. Dixon dixon at interchange.ubc.ca
Sat Sep 26 07:59:25 CEST 2009


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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