Discussion
What does the symbol IGSS represent in the context of a JFET ?
Answer: D
IGSS is the gate current when the gate-source junction is reverse-biased.
In a JFET the gate-channel p-n junction is always operated in reverse bias. IGSS, the gate reverse current or gate leakage current, is the small current that flows into the gate with the drain shorted to the source and a specified reverse voltage applied between gate and source. It is typically in nanoamperes, which is why a JFET has a very high input resistance.
The drain current is ID (with IDSS its value at VGS = 0). The gate-source voltage is VGS. Forward-biasing the gate junction is avoided in normal operation and is not what IGSS specifies.
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