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From: firstname.lastname@example.org (Ashish)
Subject: integrating a signal(Purpose)
Date: 20 Jan 2003 20:25:31 -0800
References: <3E2ADA12.88D1F51D@webaccess.net> <3E2D8256.FD2AF4AF@rica.net>
NNTP-Posting-Date: 21 Jan 2003 04:25:31 GMT
The purpose is to integrate this signal with minimal trouble
John Popelish wrote in message news:<3E2D8256.FD2AF4AF@rica.net>...
> Ashish wrote:
> > Thanks for all the postings. What I really really want is an integral
> > of the signal. However, to avoid problems I would settle for a signal
> > with slew rate proportional to the square wave described.
> Proportional to what aspect of the square wave? Its instantaneous
> > Now as the frequency of the signal is fixed at 100Khz and the duty
> > cycle varies considerably I would prefer a solution with opamps rather
> > than a simple RC to avoid issues with tolerances and leakage currents
> > etc. However all ideas are welcome.
> I assume you are trying to extract the DC component of the wave, but
> an integrator will not do this. A low pass filter may work better.
> You can produce up to a 3 pole low pass filter (with a real pole and a
> complex conjugate pair of poles) with a single opamp and a few
> resistors and capacitors. You have lots of choices as to the
> amplitude and phase response of this filter, from sharp frequency cut
> off (Chebyshev response) to phase liner, over damped (Bessel
> response), and anything in between.
> Perhaps if you told us the purpose of the resultant signal, we could
> give better advice.
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