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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