Field Effect Transistor (Field Effect Transistor abbreviation (FET)) abbreviation field effect transistor. There are two main types (junction FET-JFETs) and metal-oxide semiconductor FETs (MOS-FETs). Conducting by a majority of charge carriers is also called a monopole transistor. It belongs to the voltage control type semiconductor device. It has the advantages of high input resistance (10^8 ~ 10^9Ω), low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, wide safe working area and so on. It has become a strong competitor of bipolar transistors and power transistors.