[sdiy] fast opamp with low offset

[Ian Fritz]

At 07:28 PM 4/3/2010, David G. Dixon wrote:
> > by canceling the charge injection via a replica switch.
>
>H&H discuss using complementary switches in an integrator.  I don't have it
>at hand, as I'm not at home, but it may be worth looking into.  I suppose
>this is essentially your first suggestion.

I had to do this with my Saw TZ VCO to make the positive and negative ramps 
both reset to zero and have the same amplitude.  It wasn't hard to do -- 
just a transistor switch and an RC differentiator -- but in the end I 
actually had to make it adjustable toget it good enough.

Ian