# IC that calculates the integral of a function?

I

#### Igor Carajo

Jan 1, 1970
0
Hi,

I was hoping that someone would be able to help me. I have an
electrical signal that varies from 0V to 12V. I want to find an IC
that will integrate the function defined by the signal from time=t0 to
t1. In other words, if I were to plot my signal for a period of time,
say 0.1 seconds, I want to calculate the area under the curve. Thanks

J

#### John Popelish

Jan 1, 1970
0
Igor said:
Hi,

I was hoping that someone would be able to help me. I have an
electrical signal that varies from 0V to 12V. I want to find an IC
that will integrate the function defined by the signal from time=t0 to
t1. In other words, if I were to plot my signal for a period of time,
say 0.1 seconds, I want to calculate the area under the curve. Thanks

An operational amplifier with capacitive feedback and the signal
applied to the inverting input through a resistor produces the
negative of the integral. A second opamp can invert that back to the
true integral. Normally, the integral is set to zero at time zero by
shorting the capacitor with a field effect transistor or reed relay
contact.

See:
http://www.ecircuitcenter.com/Circuits/opint/opint.htm

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