Even easier when I read your message one more time.

Switch between integrator output and storage cell
is always open except those periods when you need
to "keep" integrated voltage.



Dmitriy Kiryashov wrote:
> 
> Hi Luis.
> 
> Store the resulted voltage in storage cell (next stage after integrator)
> As soon as integrator will reach required level switch will open shortly
> and voltage will be "copied" into storing capacitor.
> 
> Also Hill & Horowitz book is good reference to start with this.
> 
> WBR Dmitriy.
> 
> Luis Moreira wrote:
> >
> > Hi Guys
> > I am building an integrator circuit using an OPA627 and I got the
> > integrator to generate the ramp I require, but what I need also is to
> > when the integrator reaches a certain point on the ramp, which will be
> > variable, I need it to stop integrating. I don't mean reset as I do that
> > after, but I need it to stop at that value for something like 300nS. I
> > have -10V DC on the input. Values for C is 2.2n and for R 470ohms. In
> > theory if I remove the input signal the integrator should just stop
> > integrating but in practice do to switching delays, decay of signal and
> > OpAmp offset voltage it will not work.
> > Any ideas how to achieve this?
> > Thanks
> >         Luis
> >
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