a) Derive two equivalent circuits that are satisfied by the y-parameter equations. Hint:...

a) Derive two equivalent circuits that are satisfied by the y-parameter equations. Hint: Start with Eqs. 18.2. Add and subtract y₂₁V₂ to the first equation of the set. Construct a circuit that satisfies the resulting set of equations, by thinking in terms of node voltages. Derive an alternative equivalent circuit by first altering the second equation in Eq. 18.2.

b) Assume that port 1 is driven by a voltage source having an internal impedance Z_g and port 2 is loaded with an impedance Z_L. Find the current gain I₂/I_1.Check your results against the appropriate entry in Table 18.2.