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Part of the Dual Slope ADC consists of an integrator which integrates the input voltage according to Vin/-Vref .
I am using TL071 connected as an inverting integrator.
Quick summary of operation:
The output of the integrator charges negatively up to a certain count value when Vin is connected.
When the count value is reached, the controller switches to -Vref.
This causes the integrator to discharge and hence increasing output voltage (note due to inverting output).
NOW... Instead of the integrator to continue to integrate towards a positive output voltage while -Vref is connected, I want it to stop at zero voltage so that when Vin is connected as input, the integrator will start integrating negatively instantly.
Is this possible by connecting the op-amp supply terminals +Vcc to ground while -Vcc to -ve supply?
I tried this but observed clipping in the negative rail too, is it a bad approach?
Any other possible solutions?