Modeling an ideal op amp as a voltage-controlled voltage source with unlimited voltage gain is possible.
Since the output node is driven directly by a voltage source, the output resistance is thought to be zero and the input resistance is extremely high—infinite even. Furthermore, it is believed that the voltage gain is frequency independent. A Spice model for the optimal op amp may appear unimportant at first glance because it is only a single-line VCVS Spice declaration. Unfortunately, Spice does not understand infinity, hence it is impossible to specify an infinite voltage gain as a Spice value. Instead, we must provide a big but limited voltage gain value, which compromises the precision of our ideal model.
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