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-
- 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).