Re: high speed full wave rectifier

On Fri, 21 Sep 2007 10:12:38 +1200, Terry Given <my_name@xxxxxxxx>
wrote:

Jim Thompson wrote:
On Fri, 21 Sep 2007 09:21:49 +1200, Terry Given <my_name@xxxxxxxx>
wrote:


I've been playing with full wave rectifiers. one of the nicest designs
is the EDN idea on Jims website. but for 20MHz operation (200kHz
sawtooths) the opamp is a bit problematic - its response is all about
how the opamp comes out of saturation, even with the extra diode.

any thoughts?

Cheers
Terry


WHAT saturation? Are you tying to run it as single-supply? Don't ;-)

...Jim Thompson

Brain engaged, mouth (OK, fingers) now in neutral - as opposed to the
other way round.

1N4148s are not, it seems, infinitely fast :)

doh.

Thanks Jim

Nope ;-)

And it takes substantial OpAmp slew-rate at 20MHz to get good
performance.

I've only used the design up to around 1MHZ.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
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