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Cs_mosfet amplifier

by pforpashya
Tags: amplifier, csmosfet
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Apr8-14, 06:18 AM
P: 12
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?
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Apr8-14, 09:26 AM
P: 12
can anybody tell me how to attach file here?
Apr8-14, 12:05 PM
P: 410
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

Apr8-14, 03:32 PM
P: 535
Cs_mosfet amplifier

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?

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