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Basic op-amp
With negative feedback v+ ≈ v− and the resistors set the gain.
Key formulas
- Virtual short
Computes Virtual short from the circuit model and the stated conditions.
- Inverting amplifier
The inverting amp uses the virtual short: Vo=−(Rf/Rin) Vin with v+≈v− at ground.
- Non-inverting amplifier
The non-inverting amp has gain 1+Rf/Rg with input on v+ and a virtual short.
- Voltage follower
The follower is a non-inverting amp with gain 1: Vo=Vin.