Comparison With Other Transistors
At room temperature, JFET gate current (the reverse leakage of the gate-to-channel junction) is comparable to that of a MOSFET (which has insulating oxide between gate and channel), but much less than the base current of a bipolar junction transistor. The JFET has higher transconductance than the MOSFET and is therefore used in some low-noise, high input-impedance op-amps.
Read more about this topic: Uses Of Jfet
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