Precision Amplifiers for PLCs

Amplifiers have enormous voltage gain, use feedback to operate, and can be classified in different ways. They can be identified by the device they are intended to drive (e.g., headphone amplifier, speaker amplifier), the input that they are to amplify (e.g. guitar amplifier), the frequency range of the signal (e.g., RF, Audio), and by the function that they perform (e.g. inverting amplifier, power amplifier.)