Where are bandwidth, offset, and input bias current?

They are omitted on purpose: this is the textbook ideal op-amp used to teach closed-loop gain from passive feedback networks before non-ideal limitations.

Why can clipping happen if the amp is ideal?

Infinite gain only applies inside the linear feedback model; the optional rail clip is a stand-in for finite supply voltage and output swing limits.

Ideal Op-Amp (feedback)

An ideal operational amplifier is treated as having infinite open-loop gain and zero input current; closed-loop behavior uses the standard resistor formulas for inverting gain −R_f/R_in, non-inverting gain 1+R_f/R_g, and unity-gain buffering. The page plots input and output versus time for a sine or DC drive and can clip outputs to ±V_sat as a crude saturation model.

Who it's for: Introductory analog electronics after Ohm’s law; pairs with the RC filter and Bode pages.

Key terms

operational amplifier
virtual ground
negative feedback
voltage follower
gain

How it works

Ideal op-amp: infinite open-loop gain, zero input current, and (when feedback closes the loop) the output follows the classical resistor ratios. Switch among inverting, non-inverting, and unity-gain buffer; drive the input with a sine or a DC level and optionally clip the output to ±V_sat.

Key equations

Inverting: V_out = −(R_f/R_in) V_in

Non-inverting: V_out = (1 + R_f/R_g) V_in

Follower: V_out = V_in

Frequently asked questions

Where are bandwidth, offset, and input bias current?: They are omitted on purpose: this is the textbook ideal op-amp used to teach closed-loop gain from passive feedback networks before non-ideal limitations.
Why can clipping happen if the amp is ideal?: Infinite gain only applies inside the linear feedback model; the optional rail clip is a stand-in for finite supply voltage and output swing limits.

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