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Midterm Exam 2 Solutions 08

B find the small signal parameters of the main

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Unformatted text preview: lifier. b) Find the small-signal parameters of the main amplifier transistor ( rπ , gm , r0 ). [3pts] Note 1. 1 mA 1 S 26 2.6 kΩ 50 kΩ c) Find the expression and the value of the voltage gain. [4pts] Note . 1 1 1 1 Page 4 1 0.975 d) Show all parasitic capacitances of the BJTs in the circuit diagram above. Simplify the capacitances (e.g., combine all capacitances in parallel, remove capacitances that are shorted). Redraw the circuit diagram below with the simplified capacitances. [Hint: a constant DC voltage is AC ground]. [5pts] Here’s the circuit with all parasitic capacitances: And the one with the capacitances simplified: Page 5 e) Find the input and output poles of this circuits. What is the dominant pole? Find the 3-dB bandwidth of this...
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