Transistors Basics: MOSFET

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Consider the BiCMOS amplifier shown in Fig P7.82. The BJT has VB E=0.7 V and β=200 . The MOS. FET has Vt=1 V and kn=2 mAV^2. Neglect the Early effect in both devices.(a) Consider the de bias circuit. Neglect the base current in Q2 in determining the current in Q1. Find the de bias curr rents in Q1 and Q2 and show that they are approximately 100 μA and 1 mA, respectively. (b) Evaluate the small-signal parameters of Q1 and Q2 at their bias points. (c) Determine the voltage gain Av=vo / vi . For th

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