Determine the X(z) and ROC for: 1. x[n] = [(5)” + (4)n+¹]u(n) 2. x[n] = [cos 3n]u(n) 3. x[n] = [4" cos won]u(n) 4. x[n] = u(-n)² 5. x[k] = kaku(k)

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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.