Characteristics of an ideal operational amplifier

¥ Infinite voltage gain.

¥ Infinite input impedance so that any signal source can drive it.and it can avoid loading effect also.

¥ Zero output resistance so that the output can drive infinite number of other devices.

¥ Zero output voltage when input voltage is zero.

¥ Infinite bandwidth so that any frequency signal can be amplified without attenuation.

¥ Infinite slew rate. So that output voltage changes occurs simultaneously with the changes in input Voltage.

¥ Infinite CMRR then there will be no noises in the output.