Hi folks,
I have some trouble with my current circuit.
I want to build a photodiode receiver. When i only put the supply voltages for the opamps without input voltage source, i got a huge output ac voltage of about 2V. In addition, the offset voltage of the first opamp is about 8mV. It should not be so big, isn't it? What's wrong with my circuit?
Attacted is my circuit in pspice. In my circuit, the first stage is to convert photo current to voltage. The input ac voltage source and the input resistor are just used to simulate the photo current from photodiode.
I have some trouble with my current circuit.
I want to build a photodiode receiver. When i only put the supply voltages for the opamps without input voltage source, i got a huge output ac voltage of about 2V. In addition, the offset voltage of the first opamp is about 8mV. It should not be so big, isn't it? What's wrong with my circuit?
Attacted is my circuit in pspice. In my circuit, the first stage is to convert photo current to voltage. The input ac voltage source and the input resistor are just used to simulate the photo current from photodiode.
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