Questions (Part 1)

Question 1

Example 2

Answer 1

Question 2

Example 3 (Small Signal Models)

Answer 2

Question 3

Example 4 (small signal model)

What do you need to remember?

Answer 3

You need to remember to add r_e alongside any resistor connected to the emitter.

Question 4

Small Signal Analysis - Problem 2

What do you need to remember?

Answer 4

remember to add g_mv_be

also to note the output of the circuit and label it appropriately in the small signal model.

Question 5

NMOS question

What do you need to remember about calculating C_OX ?

Answer 5

To calculate C_OX you need to use E₀*E_r/t_ox .

Where E₀ = 8.854*10^-12 F/m

E_r = 3.9 for silicon.

Question 6

When a question asks you to name the ‘amplification configuration’, what do they really mean?

Answer 6

How is the BJT or MOSFET set up.

Is it CE/CS, CC/CD or CB/CG?

Question 7

What do you need to remember to place for a MOSFET small signal model ?

Answer 7

You need to remember to place r_o which usually takes a value between 10k and 1M Ohm

Question 8

How do you calculate the Vo/Vsig of a CS (MOSFET) amplifier with load at the gate (R_G )?

Answer 8

Question 9

How do you calculate the Vo/Vsig of a CS (MOSFET) amplifier with source resistance?

Answer 9