Problem#2 The transistor parameters for the given circuit are ß, = 120, B2 = 80, Vaei (on) = VBE2 (on) = 0.7 V, and VA = V42 = 0. (a) Determine the quiescent collector current in each transistor. Answer: Icı=2.253 mA, Icz- 69.73 mA. (b) Find the small-signal voltage gain A, - vo/vs. Answer: 0.99. (c) Determine the input and output resistances Ra and Ro. Answer: R» = 467.6 k2, R, = 0.512 2. Vcc=9 V R - 5 V v 0.5 k2 R, 50 2
Problem 1:
Consider the circuit shown below. The transistor parameters are Kn1 = 0.5 mA/V2 , Kn2 = 0.2 mA/V2 , VT N1 = VT N2 = 1.2 V, and λ1 = λ2 = 0. The quiescent drain currents are ID1 = 0.2 mA and ID2 = 0.5 mA. (a) Determine the small-signal voltage gain of the given multistage amplifier. Answer: -6.14. (b) Calculate the small-signal output resistance Ro. Answer: 1.32 kΩ.
Problem 2:
The transistor parameters for the given circuit are β1 = 120, β2 = 80, VBE1 (on) = VBE2 (on) = 0.7 V, and VA1 = VA2 = ∞. (a) Determine the quiescent collector current in each transistor. Answer: IC1 = 2.253 mA, IC2 = 69.73 mA. (b) Find the small-signal voltage gain Av = vo/vs. Answer: 0.99. (c) Determine the input and output resistances Rib and Ro. Answer: Rib = 467.6 kΩ, Ro = 0.512 Ω
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