[sdiy] super-duper S/H

Roman Sowa modular at go2.pl
Thu May 21 18:05:32 CEST 2015


ouch! that's a lot.
if it stays at the same level in entire range of input voltages, then 
compensating it with DC at the output seems so obvious. Or maybe make 
the compensation switchable by sample gate signal, so it's not added in 
Sample time, but only in Hold time.

Roman

W dniu 2015-05-21 o 17:43, Ian Fritz pisze:
> 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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