desperado1
Full Member level 3
jfet input impedance
In comparision to BJT why is the input impedance of JFET and MOSFET very high ?
In comparision to BJT why is the input impedance of JFET and MOSFET very high ?
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thanks for the reply but i am still a bit confused. can u please show it pictorically ?Awarapunshee said:The gate lies on an insulated thin oxide layer (dielectric) above the substrate between the source and drain. The gate is effectively one side of a capacitor. This is the input impedance being referred to - the fact that the gate has no DC path to either source, drain or substrate.
gate to channel junction ....?? do u mean gate to drain junction by this...??in jfet the gate-channel junction is always reverse biased so the input impedance is high.if it was forward biased the input impedance bocomes very low.