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Subject: Re: Formula

Date: 12/16/01 at 7:42 PM
Posted by: Russ Kincaid
E-mail: russlk@yahoo.com
Message Posted:

In Reply to: Formula posted by Ted Pantenberg on 12/16/01 at 6:00 PM:

If the input voltage is not constant, you will have to do an integration, but assuming that the input voltage is constant: The output of the op amp integrator (ex) is given by:

ex = ein*(t1-t0)/R1/C1 + ex0 where
t0 = the beginning time
t1 = the elapsed time
R1 = the input resistor to the op amp
C1 = the feedback capacitor
ex0 = the output of the op amp at t0

Since the input to the R2-C2 filter is not constant, an integration is required:

The output (eo) is:

eo = 1/R2/C2 * integral(ex-eo)dt
This may be a simple problem for a mathematician but it has been many years since I have done it, so I leave the solution to others.


Follow Ups:


      Re: Formula John Dunn - Consultant   Posted at: 12/16/01 (2)

        Re: Formula John Dunn - Consultant   Posted at: 12/16/01 (1)

          Re: Formula John Dunn - Consultant   Posted at: 12/16/01 (0)


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