High input resistance and high gain Inverting amplifier can be needed in some applications.
In such case an even larger feedback resistor is required. Too large resistors have issues like precision, availability and excessive stray capacitance.
The here below circuit is a way to maintain both a high input resistance, a high gain and still using not too large feedback resistors.
Questions:
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1) If the opamp is perfect (infinite gain, bias currents i+=i-=0, etc …), we have U+=U-=0V and Rin=100kohm
2) For me, the gain of this inverting amplifier is about -102.
1) If the opamp is perfect (infinite gain, bias currents i+=i-=0, etc …), we have U+=U-=0V and Rin=100kohm
2) For me, the gain of this inverting amplifier is about -102.
