An op-amp is said to be ideal if it has the following characteristics.

  • Open loop voltage gain (AOL) is infinity.

  • Input resistance (Ri) is infinity.

  • Output resistance (Ro) is zero.

  • Bandwidth (BW) is infinity.

  • Zero off-set (i.e) V0 = 0, when V1 = 0 & V2 = 0.

An ideal op-amp cross no current and both the input terminal i 1 = i2 = 0. Because gain is infinite the voltage between inverting and non-inverting terminals i.e op-amp is essentially zero for infinite output voltage V0 is independent of the current drawn from the output is R0 = 0.

 

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