4.5 Unipolar Transistors

As with diodes, transistors are classified as either unipolar or bipolar. In unipolar transistors such as MOSFETs and JFETs, conduction involves only one type of carrier, typically electrons, and the blocking layer is not subject to conductivity modulation [37,40]. Unipolar devices obey the on-resistance blocking voltage relations given by (4.9) and (4.10). In addition, both MOSFETs and JFETs have high input impedance, greatly simplifying the design of control circuits.
T. Ayalew: SiC Semiconductor Devices Technology, Modeling, and Simulation