As a part of an assignment to design a common source amplifier, I came up with this circuit:
simulate this circuit – Schematic created using CircuitLab
The transistor is a 180nm technology with aspect ratio 2 and early voltage 0.9V for it's dimensions. Also, \$ \mu_nC_{ox} = 300\mu A/V^2 \$. after using that information, I obtained current through the drain to be nearly \$ 80 \mu A\$, transconductance to be \$ 120\times10^{-6}\Omega^{-1} \$, and a small circuit equivalent of:
*Please be free to correct any mistakes that I may have done in my calculations. Any help is appreciated in that regard.
My doubt here is how do I calculate the power dissipated in my circuit. Across the resistor R, it is just \$ I^{2}R\$ but how do I do the same calculations to determine the MOSFET power dissipation. Can I use the small signal equivalent to determine that or do I need to consider any other factors? Any help is appreciated, and a mathematical expression to determine the value of power is more than appreciated.
*If you can also suggest any improvement in the circuit to improve my gain, you're welcome to do so. Based on my calculations, I obtained it to be nearly 5.53. You may give changes in aspect ratios or resistances in my circuit.
