try abs(a-b)
indeed, a peak that sharp is called an asymptote.
a+b ----- |a-b|
will be hard to do in analogue, especially as you're interested in the high bit.
a+b -------- |a-b|+k should be possible though.
Voltage Divider
Jan 26, 2009
21 Replies
Wrong book. Try Jung's _IC OP-Amp Cookbook_.
Another way, especially if you need digital numbers in there somewhere, is to use the analog and reference inputs of a succesive approximation ADC. Make sure the reference input can handle the AC response, some chips stick some strange slow op-amps in there internally.
Mark Zenier snipped-for-privacy@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)
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