Equation Deck

Question 1

BJT in active mod: i_C - v_CE equation

Answer 1

Question 2

What are the model parameter equations for in terms of DC bias currents for the pi and t model?

Answer 2

Question 3

Relationships between α and β ?

Answer 3

Question 4

CE amplifier with an emitter resistance: resistance reflection rule

Answer 4

Question 5

How do you get the current through the emitter if you know the base?

Answer 5

Multiply the base by (β+1)

Question 6

r_π and r_e in terms of g_m

Answer 6

Question 7

Relationship between r_π and r_e?

Answer 7

Question 8

Whats is the equation for i_D in the triode region?

Answer 8

Question 9

Whats is the equation for iD in the saturation region?

Answer 9

Question 10

Upper 3-dB frequency equation

i.e. the frequency of the dominant pole (if it exists…)

What happens if it doesn’t exist?

Answer 10

tau_H will equal the sum of tau’s multiplied by 2π

Question 11

Negative Feedback: Configuration equations for Gain, Rin and Rout.

Answer 11

Question 12

Op-amps: Inverting Amplifier

Answer 12

Question 13

Op-amps: Non-inverting amplifier

Answer 13

Beta = feedback ratio

Question 14

Op-amps: Transimpedance amplifier

Answer 14

Question 15

Op-amps: Integrator

Answer 15

Finds usage in analogue filters, control systems, A/D converters and many other applications.

Question 16

Op-amps: Log amplifier

Answer 16

Useful in applications where the input signal level may vary by a large factor. It may be desirable in such cases to amplify weak signals and attenuate strong signals.

Question 17

Op-amps: Square-root amplifier

Answer 17

Question 18

Power Amplifiers: Efficiency calculation?

Answer 18

η = P_L/ P_S

Question 19

CE Amplifier: What is it’s mid-band gain equation?

Answer 19

Question 20

Miller’s Theorem Equation

Answer 20