From NMOS input stage and resistive loads to PMOS input stage and resistive loads?

Dear All,

The following is Differential Amplifier with Resistive Load with NMOS input stage and resistive load . How to use the same simulated method to simulate a differential pair with PMOS input stage and resistive load with Vdd=2.5V, Vss= -2.5V and Vo=0V ?

Differential Amplifier with Resistive Loads

* Set options

.option post probe

* Element Statements

vdd vdd 0 2.5

vss vss 0 -2.5

m1 vout- vin+ 1 vss cmosn w=100u l=1.0u

m2 vout+ vin- 1 vss cmosn w=100u l=1.0u

r1 vdd vout- 50k

r2 vdd vout+ 50k

i1 1 vss 100u

e1 vin+ 2 3 vss 0.5

e2 vin- 2 3 vss -0.5

vcm 2 vss 2.5

vs 3 vss dc=0

* Control statements

.dc vs -0.5 0.5 0.01

.probe v(vout+,vout-)

.tf v(vout+,vout-) vs

.op

* Include device model with filename "cmos05.mod"

.include cmos05.mod

.end