2. The control input current of 2.FET is very small, so its input resistance (107 ~ 10 12ω) is very large.
3. Most of the carriers are used to conduct electricity, so its temperature stability is good;
4. The voltage amplification coefficient of the amplifier circuit is smaller than that of the transistor amplifier circuit;
5, the field effect tube has strong radiation resistance;
6. Because it has no shot noise caused by chaotic electron diffusion, the noise is low.
Extended data:
Field effect transistors are divided into junction field effect transistors and MOS field effect transistors.
Even if the gate voltage of the junction field effect transistor is zero, current flows, so it is used as a constant current source or an audio amplifier because of its low noise.
MOS field effect transistors are widely used in many fields, such as high-frequency devices such as LSI basic devices and power control devices, because of their simple structure, high speed, simple gate driving and strong anti-destructive power supply ability. Micro-machining technology can directly improve their performance.
Baidu encyclopedia -FET