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The average voltage at the output is not varying.
The first opamp is an integrator and the second one is a comparator. These form a relaxation oscillator.
Hi,
I am trying to simulate an interface circuit for capacitive sensors which is based on switched capacitor technique.
My problem is that while varying the sensor capacitor, the frequency is not varying.It is constant.But when there is a feedback from the comparator output to the sensor...
I also have some doubts regarding this circuit. When simulating, there is no frequency variation(frequency is constant while capacitance is varying). When there is a feedback from comparator to the sensing capacitor,then the frequency is varying. But then what is the use of input voltage source...
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