Vdd = 2.5V
How do I calculate the last 2 variables - Vbias and Vin+ and Vin- so that I can simulate it in LTSPICE?

 

Knowing I5, I1, I2, you can calculate Vgs5, Vgs1 and Vgs2. From that you can calculate input common mode voltage Vin and Vbias.

 

Knowing I5, I1, I2, you can calculate Vgs5, Vgs1 and Vgs2. From that you can calculate input common mode voltage Vin and Vbias.

So applying the above formula , I will be able to find Vgs5 , Vgs1 and Vgs2
Then to find Vbias
Vsg5 = Vs5 - Vg5
Vbias = Vg5 and vs5 = Vdd
So Vbias = Vdd - Vsg5.

To find Vin-
VDS5 = Vdrain - Vdd --> Vdrain = VDS5-vdd
Vdrain = Vs1
Vin+ = Vdrain - Vsg1

To find Vin+
Vdrain = Vs2
Vin- = Vdrain - Vsg2

Am I correct?

 

To find Vin-
VDS5 = Vdrain- Vdd--> Vdrain= VDS5-vdd
Vdrain = Vs1
Vin+ = Vdrain - Vsg1

Vdrain = VDS5+vdd

For input common mode voltage Vcm = Vin+ = Vin- = Vdd - Vsd5 - Vsg1.
(Vsg1 = Vsg2)

 

Vdrain = VDS5+vdd

For input common mode voltage Vcm = Vin+ = Vin- = Vdd - Vsd5 - Vsg1.
(Vsg1 = Vsg2)

Thank you.

So is my equation for Vbias correct as well?

 

Thank you.

So is my equation for Vbias correct as well?

Yes, it is OK.