Question

When temperature increases, what will happen to threshold voltage, PIV and inverse saturation current?

Answer 1

when the temperature increase the electron mobility will also increase so it will be easier to form conduction in the channel with a lower threshold voltage.

Like forward voltage, the PIV rating of a diode varies with temperature, except that PIV increases with increased temperature and decreases as the diode becomes cooler, exactly opposite that of forward voltage

Inverse saturation current (IS) of diode increases with increase in the temperature the rise is 7%/ºC for both germanium and silicon and approximately doubles for every 10ºC rise in temperature. Thus if we kept the voltage constant, as we increase temperature the current increases.