According to the signal processed, integrated circuits can be divided into:

1 According to the signal frequency (microwave, high frequency, low frequency).

2 Discrete type of signal (digital and analog).

3 According to the signal power (large power small signal).

Integrated operational amplifiers are available in all of the above types.

As an amplifier, the integrated operational amplifier mainly uses its linearity.

The integrated operational amplifier is used as an oscillator and comparator, taking advantage of its nonlinearity.