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H parameter equivalent circuit The input circuit appears as a resistance h11 in series with a voltage generator h12 v2. The output circuit involves two components ; a current generator h21 i1 and shunt resistance h22. Performance of a Linear Circuit in h Parameters (i) Input Impedance: Now, i2 = h21 i1 + h22 v2 in terms of h parameters, and from the figure i2 = - v2/rL. So, If either h12 or rL is very small, the second term in exp. (iii) can be neglected and input impedance becomes : (ii) Current gain: referring to the figure, the current gain Ai of the circuit is given by: h parameter Page 1 (ii) Current gain: referring to the figure, the current gain Ai of the circuit is given by: (iii) voltage gain: Referring to the figure again, the voltage gain of the circuit is given by: h parameter Page 2 Transistor h parameters For small signal transistor behaves like a linear circuit. h parameter Page 3 h parameter Page 4 The h-parameter formulas (CE configuration): h parameter Page 5 h parameter Page 6 h parameter Page 7