Hi,
I would like to know what can cause the initial charge inside my capacitor in an integrator circuit ?
Because for a simple integrator circuit with 10kohm input resistor and a 1uf capacitor on the feedback to the inverting pin. I also have a nulling circuit for the op amp to reduce the offset voltage to 0v before hand.
There is an DC offset voltage of appro 7.2V when I using the oscilloscope to measure.
All the ground are to a common ground from the power supply 0V.
I would like to know what can cause the initial charge inside my capacitor in an integrator circuit ?
Because for a simple integrator circuit with 10kohm input resistor and a 1uf capacitor on the feedback to the inverting pin. I also have a nulling circuit for the op amp to reduce the offset voltage to 0v before hand.
There is an DC offset voltage of appro 7.2V when I using the oscilloscope to measure.
All the ground are to a common ground from the power supply 0V.