Why op-amp is not used as an amplifier in the open loop configuration?


Answer: In practice the open loop op-amp is not used due to the following reasons-

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  • Due to very large open loop gain, distortion is introduced in the amplified output signal.
  • The open loop gain does not remain constant. It varies with changes in temperature and power supply.
  • The bandwidth of an op-amp in the open loop mode is very small almost zero. For this reason the open loop op-amp is not used in practice as an amplifier.
  • However the op-amp in open loop configuration is used in applications such as comparators (both inverting and non inverting comparators).