Cs_mosfet Amplifier Troubleshooting

[pforpashya]

Hi all,

I am studying cs_mosfet amplifier and i have simulate one simple amplifier with VDD=+12v Vs=1v ID=0.5mA gm=1mA/v Vd=6v. I am getting a signal that is amplified by gain -11.3 by calculation and also on simulation but when doing on hardware i am getting gain around -40 to -45
I am using Bs 170 mosfet.

I have tried various combination of capacitors but still gain comes around -40...can anybody suggest me where is the mistake?

 

[pforpashya]

can anybody tell me how to attach file here?

 

[Jony130]

How can you be sure that your real MOSFET Bs170 will indeed have gm = 1m?
Do know how to measure Vgs(th) and how you can find K - factor ?

PS Go advanced ---> Attach Files

 

[analogdesign]

Can you verify you are using the correct transistor?

Can you verify you are using the correct resistor?

Have you verified the DC operating point?