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Op-Amp

Ideal operational amplifier

Library

Electrical Elements

Description

The Op-Amp block models an ideal operational amplifier (op-amp). The figure shows the implementation schematic.

The block implementation is based on the following assumptions:

  • The ideal op-amp gain A is assumed to be infinite

  • Then, for finite output, must have V1 = 0

  • Ideal op-amp also implies current from p to n is zero (i1 = 0)

These assumptions result in the following equations for the block:

equations
    v1 == p.v - n.v;
    v1 == 0;
    i1 == 0;
end

For more information, click the Source code link in the block dialog box.

You can initialize the Current into output node variable prior to simulation. For more information, see About Variable Initialization.

Ports

The block has three electrical conserving ports.

Introduced in R2007a

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