1
\$\begingroup\$

This is the problem:

And this is my design for R1 and R2:

enter image description here

So, using B2 Spice simulator I made this circuit according to the design:

Vin_ and Vout_ are voltmeters.

But the problem is that when I run the simulation, I get this graph:

Vin_ shows correct result.

Vout_ should be amplified by Av(=10) but I don't know why it is not in this graph !!

Please show me where the mistake is.

Thanks.

\$\endgroup\$

1 Answer 1

1
\$\begingroup\$

For the mosfet to work as an amplifier, it needs to be biased in the saturation region, ie Vgs needs to be > Vt (4.15V). And it needs to remain so irrespective of excursions of +/- 100mV of v in.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.