Question

1.24P)a) Plot the structure of p-channel MOS-FET (Show semiconductor structure, gate, drain, source and voltage polarities) and summarize the working principle. b) Explain what happens if you change drain source voltage polarity. c) Plot the band diagram, approximate distributions of charge, electric field, and electrostatic potential in the ideal MOS capacitor in inversion for the p-channel case.

Answer 1

Son:- p-channel-mos-fet: - (9) Do (Drain) 늪 Gate source v (source) G. Gate go (Doain) PH PV sioz didectrics Diffused channel P-channels MOSFET A p-channel MOSFET is constructed like a N-channel mosfet , starting with N-type substrate and diffusing P tybe drain and source block and connecting them internally by a P- dopped channel regitna. SIO2 is a tybe ob ingulatos referred di electrics, which develope obb osite.. electoic field within dielectoris expose to an externally applied fields. ay

(6) When the drain is made tve with regbect to source, a drain current will flow, even with zero gote botential and the MOSFET is said to be operating E-mode. In mode of operation gate attracts the - ve charge carrier from P- subtracts to N- channels and thus reduce the channel resistance and increase the drain current. The tve the gate is made, the more drain current flow. more (C2 MOS Capacitor- (induced negative space charge region) Il field ttttt V P-type ht 1 P-type E-field att + tt + TA (p-type V IP-type Accumulative layer of electron. Induced negative space charge region.