CA3140 Integrator Circuit: No Step Ramp Output With 3MΩ & 1μF—What Could Be Wrong?

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#1 21663385 11 Aug 2012 04:55

Syed Kaleem Syed Kaleem

Anonymous

Post #1
21663385 11 Aug 2012 04:55

Hello everyone,

I have designed a simple integrating circuit using CA3140 op-amp, 3M ohm resistor and 1 micro farad capacitor. But i am not able to get an step ramp output signal in my CRO.

I request if anyone advice me what must be wrong or any changes do i need to do for my circuit to get a good step ramp output.

Thanking you in advance for your advice.

Syed
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#2 21663386 11 Aug 2012 08:34

Calinoaia Valentin Calinoaia Valentin

Anonymous

Post #2
21663386 11 Aug 2012 08:34

Hi,

In order to generate a ramp signal, you need to build a circuit like this one: http://www.piclist.com/images/www/hobby_elec/e_ckt17.htm, that uses 2 op-amps, or you could also use a transistor as a constant current source to charge a capacitor at a constant current to generate a ramp voltage across it...
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#3 21663387 11 Aug 2012 09:03

Steve Lawson Steve Lawson

Anonymous

Post #3
21663387 11 Aug 2012 09:03

And if it's a "step" waveform you are looking for, how about a counter feeding a DAC.

Or, how about a diagram of what you got?
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#4 21663388 11 Aug 2012 12:35

Syed Kaleem Syed Kaleem

Anonymous

Post #4
21663388 11 Aug 2012 12:35

Hello Valentin,

I appreciate for your advice and solution.

But i am looking for a step ramp as you said its correct if i use 1 opamp (ca3140) i may get negative step ramp. Then i need to use second opamp to get the step ramp in positive. Your circuit diagram is showing sawtooth.
i will attach my circuit design.
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#5 21663389 11 Aug 2012 12:36

Syed Kaleem Syed Kaleem

Anonymous

Post #5
21663389 11 Aug 2012 12:36

Sure i will attach for your comment.
#6 21663390 14 Aug 2012 04:41

Ian Brown Ian Brown

Anonymous

Post #6
21663390 14 Aug 2012 04:41

Is it possible you can put up a circuit diagram as the integrating op amp will not generate a signal unless you stimulate it with something?

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CA3140 Integrator Circuit: No Step Ramp Output With 3MΩ & 1μF—What Could Be Wrong?

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