Reference no: EM132167074

Problem 1

Consider the following circuit. Assume V_EB (ON) = 0.7V, V_EC (sat) = 0.3V, β = 100, R_C = 2kΩ. I_Q is a DC current source.

Determine the maximum value of I_Q so that the transistor remains in the active region.

Problem 2

Assume V_BE(on) = 0.7V, β = 100, RE = 0.5kΩ.

a) Determine R_C such that I_C = 1mA and the Q-point is in the middle of the DC load line.
b) Determine R₁ and R₂ such that the biasing is stable.

Problem 3

Consider the following common emitter amplifier with R₁ = 100kΩ, R₂ = 100kΩ, R_C = 2kΩ, R_E = 1kΩ, R_L = 1kΩ.

Assume β = 100, V_A = 100V , V_BE(on) = 0.7V, V_T = kT/e = 0.026V

a) Determine the Q-point (I_C , V_CE)
b) Draw the small-signal equivalent circuit.
c) Determine the voltage gain.
d) Determine the maximum symmetrical output voltage swing.

Problem 4

Consider the following amplifier with V_CC = 3.3V, R_L = 4kΩ, R_E = 12kΩ, R₁ = 585kΩ, R₂ = 135kΩ.

Assume β = 90, V_A = 60V , V_EB (on) = 0.7V

a) Determine the Q-point (I_C, V_EC)

b) Draw the dc and ac load lines and indicate the Q-point.

c) Draw the small signal equivalent circuit

d) Using the reflection rules, write expressions for R_in and R_out.

e) Determine the voltage gain.

Figure