The input circuit appears as a resistance h11in series with a voltage generator h12v2. The output circuit involves two components ; a current generator h21i1and shunt resistance h22.
Performance of a Linear Circuit in h Parameters
(i) Input Impedance:
Now, i2= h21i1+ h22v2in terms of h parameters, and from the figure i2= - v2/rL. So,
If either h12or rLis 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 Aiof the circuit is given by:
H parameter equivalent circuit
h parameter Page 1
(ii) Current gain: referring to the figure, the current gain Aiof the circuit is given by:
(iii) voltage gain:
Referring to the figure again, the voltage gain of the circuit is given by:
Transistor h parameters
For small signal transistor behaves like a linear circuit.
h parameter Page 3
The h-parameter formulas (CE configuration):
h parameter Page 5
h parameter Page 7
