h-Parameters
Hybrid model for the transistor amplifier can be derived as shown below:
By considering CE configuration as show in the figure 3. The variables, iB, iC ,vC, and vB represent entire instantaneous currents and voltages iB and vC can be taken as the independent variables and vB, IC as the dependent variables.
![125_hybrid model.png](https://www.expertsmind.com/../CMSImages/125_hybrid model.png)
Fig. 1
vB = f1 (iB ,vC ) IC = f2 ( iB , vC ).
By using Taylor 's series expression, and neglecting the higher order terms we obtain.
![1023_h parameter.png](https://www.expertsmind.com/../CMSImages/1023_h parameter.png)
Partial derivatives are taken keeping collector voltage or base current constant. The ΔvB, ΔvC, ΔiB, ΔiC represent the small signal base and collector current and voltage and can be represented as vb, ib, vC, iC.
![147_h parameter1.png](https://www.expertsmind.com/../CMSImages/147_h parameter1.png)
The model for CE configuration is shown in the figure 2.
![1279_h parameter2.png](https://www.expertsmind.com/CMSImages/1279_h%20parameter2.png)
Figure 2
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