[sdiy] super-duper S/H

Ian Fritz ijfritz at comcast.net
Thu May 21 17:43:30 CEST 2015


Hi Roman --

It's about 150 mV out of a +/-4 V signal.  I believe it can simply be 
subtracted out, no?  The cap is used in feedback mode, so it's followed by 
an opamp inverter, and I think you can just compensate right there.  It's 
rather larger than I would like, because it comes from needing four MOSFETs.

Ian


At 09:19 AM 5/21/2015, Roman Sowa wrote:
>Less than 3 cents over an hour? That's more than impressive!
>With holding capacitor so small, how big is the charge injection effect? I 
>mean what is the jumping error in output voltage between Sample and Hold 
>stage of the circuit?
>
>Roman




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