An Enhancement-Type NMOS Amplifier

** Circuit Description **
* dc supplies
Vdd 1 0 DC +20V
Vgs 4 0 DC +5V
* small-signal input
vi 3 4 PWL (0,0 0.25ms,+0.5V 0.75ms,-0.5V 1.25ms,+0.5V 1.75ms,-0.5V
+           2.25ms,+0.5V 2.75ms,-0.5V 3ms,0V)
* amplifier circuit
M1 2 3 0 0 nmos_enhancement_mosfet L=10u W=10u
Rd 1 2 1.33k
* mosfet model statement (by default, level 1)
.model nmos_enhancement_mosfet nmos (kp=2m Vto=+2V)
** Analysis Requests **
.OP
.TRAN 10us 3ms 0ms 10us
** Output Requests **
.PLOT TRAN V(2) V(3)
.probe
.end