4 Consider the following common-emitter amplifier. Assume operation in the frequency range for which the coupling and bypass capacitors are short circuits. (1) Draw the dc circuit, and determine the value required for R₂ so that I₂ = 3.3mA. (2) Find IBQ, ICQ, UCEQ and r. (3) Draw the small signal equivalent circuit. (4) Calculate values for voltage gain Av, input impedance Zin, and output impedance Zo. Vcc=12V Vec Moff 100 £2 6152 WIK Vag Vazo0.7V 312 B-100 RkQ

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Differential amplifier

There are two amplifying stages with common degeneration in a differential amplifier.