b) Draw the small signal AC equivalent circuit for the network shown in Figure Q3b considering r, = rce = 0 and determine the value of: le and VCE i) le and re the input impedance, Zi the output impedance, Z. voltage gain, Av =VN¡ the current gain, A; = I/l; vi) 25V Rc=1K R3=100K C. Vo Vi B=100 R2=22K Z. Zi

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Z parameter

The Z-parameters that are the impedance parameters of a two-port network are defined by expressing the two-port voltages V1 and V2 in terms of two-port currents I1 and I2. The Z-parameters are calculated by open circuiting one of the two ports at a time henceforth they are called open-circuit impedance parameters.