Overlooking the obvious: the input impedance of a difference amplifier - Precision Hub - Archives - TI E2E support forums
![operational amplifier - Confusion with output impedance of non-inverting and inverting opamp circuit - Electrical Engineering Stack Exchange operational amplifier - Confusion with output impedance of non-inverting and inverting opamp circuit - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/QPkt2.png)
operational amplifier - Confusion with output impedance of non-inverting and inverting opamp circuit - Electrical Engineering Stack Exchange
![operational amplifier - Input Impedance of the Inverting Op Amp - Electrical Engineering Stack Exchange operational amplifier - Input Impedance of the Inverting Op Amp - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/C4T9G.png)
operational amplifier - Input Impedance of the Inverting Op Amp - Electrical Engineering Stack Exchange
![operational amplifier - Calculation of the input resistance of an op amp circuit - Electrical Engineering Stack Exchange operational amplifier - Calculation of the input resistance of an op amp circuit - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/oJOum.png)