Design an inverting amplifier stage and check its input impedance and offset.
The inverting input is held at a virtual earth by feedback, so the input impedance is simply the input resistor. Output swing is limited to roughly 1.5 V inside each rail for most op-amps. Low input resistors give low input impedance, which can load the source — the main drawback of the inverting configuration.
Inverting Op Amp
A = −R_f ÷ R_in; input impedance = R_in
A = −R_f ÷ R_in; input impedance = R_in The inverting input is held at a virtual earth by feedback, so the input impedance is simply the input resistor. Output swing is limited to roughly 1.5 V inside each rail for most op-amps.
Low input resistors give low input impedance, which can load the source — the main drawback of the inverting configuration.
This calculator takes 4 inputs: Input resistor, Feedback resistor, Input voltage, Supply rail. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.