The threshold voltage for the n-channel enhancement mode MESFET is( ), the threshold voltage for the n-channel depletion mode MESFET is( ).( )
A. positive, positive
B. negative, negative
C. positive, negative
D. negative, positive
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Which one is not Junction Field-Effect Transistor.( )
A. pn JFET
B. MESFET
C. HEMT
D. bipolar transitor
The internal pinch-off voltage Vp0 is the gate-to-source voltage to achieve pinch-off.( )
The ideal saturation drain current is independent of the drain-to-source voltage.( )
As frequency needs, power capacity, and low noise performance requirements,the high electron mobility transistor ______ fabricated from ______ .