I was trying to simulate ac-coupled instrumentation amplifier for my EEG amplifier, to get rid of dc offset from my signal. The inputs have 300mV of differential dc offset and 0.1 mV signal. So, I was expecting output as :
Vout = gain * 0.1mV
without the dc offset in output, as the integrator feedback acts as a high pass filter.
But when I set gain of 20, I get 20 mV of signal with 2.20 V of dc offset. How is this dc offset coming here?
Can someone describe what is wrong with this circuit? I want to have maximum gain for the signal as possible from the inst. amplifier so that noise from further circuit doesnt have much effect on signal.
Vout = gain * 0.1mV
without the dc offset in output, as the integrator feedback acts as a high pass filter.
But when I set gain of 20, I get 20 mV of signal with 2.20 V of dc offset. How is this dc offset coming here?
Can someone describe what is wrong with this circuit? I want to have maximum gain for the signal as possible from the inst. amplifier so that noise from further circuit doesnt have much effect on signal.
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