Electrical Engineering Archive: Questions from 2024-09-30

Consider a bipolar cascode amplifier biased of 2 mA. The transistors used have β = 100, ro = 100 kΩ. A load resistance RP = 2.4 kΩ is connected at the output. Find the voltage gain Av

For the circuit shown in Figure. 3, assume the circuit parameters are: VCC = 5 V, VBB = 1.025 V, RB = 100 kΩ, and RC = 6 kΩ. Consider the transistor parameters as β = 150, VBE(on) = 0.7 V, and VA = 150 V. (a) Calculate the Q-point values (ICQ, VCEQ) using DC analysis, (b) Determine the small-signal hybrid−π parameters (rπ, gm, ro), (c) Find the small-signal voltage gain Av = Vo/Vs. [22 Marks] Figure. 3

For the circuit shown in Figure. 5, consider the circuit parameters as VCC = VEE = 3.3 V, RS = 500 kΩ, RL = 6 kΩ, RB = 100 kΩ, RE = 12 kΩ, and RC = 12 kΩ. The transistor parameters are: β = 120, VBE(on) = 0.7 V, and VA = ∞. (a) Calculate the Q-point values (ICQ, VCEQ) using DC analysis, (b) Determine the small-signal hybrid−π parameters (rπ, gm, ro), (c) Find the small-signal voltage gain Av = vo/vs, (d) Find the small-signal current gain Ai = io/ii, (e) Determine the input resistance Ri and output resistance Ro. [30 Marks] Figure. 5

Problem #1 The PMOS in the circuit below have kp′ = 0.05 mA/V2, and Vt = -1.5 V. The NMOS has kn′ = 0.08 mA/V2, and Vt = +1.5 V. Find the drain current ID and three terminal voltages (VG, VD, VS) for every transistor.