[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.
More information about the Synth-diy
mailing list