1=h1I1+h12 12=h21I1+h2 LetV2=0句,s the short-circuit input impedance 0 the short-circuit forward current gain I1V2=0 Let /1=0,、v1 the open-circuit reverse voltage gain I1=0 the open-circuit output admittance2 = 0 • Let V 1 2 0 1 11 = = • • • I V V h 1 2 0 2 21 = = • • • I V I h the short-circuit input impedance the short-circuit forward current gain 1 = 0 • Let I 1 0 2 1 12 = = • • • I V V h 1 0 2 2 22 = = • • • I V I h the open-circuit reverse voltage gain the open-circuit output admittance 2 • 1 I • I − + • V 2 − + • V 1 2 12 1 11 1 • • • V = h I + h V 2 22 1 21 2 • • • I = h I + h V