Photodiodes, whose internal structure is a semiconductor device composed of a PN junction. Like common diodes, they have the characteristic of unidirectional conduction. Applications such as color measurement, emission spectrometers, gas detectors, and turbidity meters usually use photodiodes to achieve precision optical measurements.

In daily life, signal amplification can be seen everywhere. For example, after the audio system processes the tiny audio signal, it drives the speaker to produce a loud and clear sound; in the field of communications, the weak signal of the mobile phone is enhanced by the base station power amplifier to achieve long-distance stable communication. All of these are inseparable from the power amplifier.

ADM2587EBRWZ is an isolated RS-485/RS-422 transceiver chip produced by Analog Devices, which can be configured as half-duplex or full-duplex.