Try Googling for:

schematic analog multiplier

I didn't look closely at the results, but they looked promising.

Bob Ammerman
RAm Systems


----- Original Message ----- 
From: "Todd Bailey" <tm_bailey@hotmail.com>
To: <piclist@mit.edu>
Sent: Thursday, June 09, 2005 6:08 PM
Subject: Re: [EE] Analog "Proportional" Amplifier Design Question


> Mike,
>
>  The equation you suggested is absolutely right -- that's exactly the 
> function I want, although the circuit doesn't have to be single supply.
>
>  Further, to clear things up w/r/t an earlier suggested solution:
> Vout isn't necessarily going into an ADC -- it might very well stay 
> analog, so the output has to be linear.  Seems like it'd be totally doable 
> with a few op amps -- is that true?
>
> Thanks again,
>
> Todd
>
> -------------------------------------------------
>
> Mike Hord wrote:
>
>
> To clarify:
>
> Given Va, Vb, and Vc, with output Vout and single-rail supply Vdd:
> Vout = [(Vb-Vc)/(Va-Vc)]*Vdd
> where Va > Vb > Vc, right?
>
> Mike H.
>
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