types: Junction FET (JFET) and metal oxide semiconductor FET (MOS-FET). Most carriers participate in the conduction, also known as unipolar transistor. It belongs to a voltage controlled semiconductor device. It has the advantages of high input resistance (107 ~ 1015 惟), 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 for bipolar http://www.zhuhepcba.com/manufacturing/semiconductor/