A CMOS Amplifier

** Circuit Description **
* dc supplies
Vdd 1 0 DC +10V
Iref 2 0 DC 100uA 
* input signal
Vi 4 0 DC 0V
* amplifier circuit
M1 3 4 0 0 nmos L=10u W=100u
M2 3 2 1 1 pmos L=10u W=100u
M3 2 2 1 1 pmos L=10u W=100u
* mosfet model statements (by default, level 1)
.model nmos nmos (kp=20u Vto=+1V lambda=0.01)
.model pmos pmos (kp=10u Vto=-1V lambda=0.01)
** Analysis Requests **
* calculate DC transfer characteristics
.DC Vi 0V +10V 10mV
** Output Requests **
.PLOT DC V(3)
.probe
.end