|
|


where








|





|




|
|
|
|
or
|
When we substituted into equations (3) and (4)
|
This allows us to write
|
and
|

and
With g11 = g22 = 0 we obtain the desired result. We also conclude gm
gm and rπ can be calculated using operating point. The four-element low-frequency model of Figure 24(b) is used when base-width modulation cannot be ignored or a more precise analysis is to be performed. Circuit parameters can be related to the two-port model parameters in a straightforward fashion.
|
|
|
|
|
|
|
|
|
Sr.no | Parameter | CB | CE | CC |
1 | Common terminal betnI/p & o/p | Base | Emitter | collector |
2 | Input Current | IE | IB | IB |
3 | Output Current | IC | IC | IE |
4 | Current Gain |
|
| ɤ= |
5 | Input Vtg. | VEB | VBE | VBC |
6 | Output Vtg. | VCB | VCE | VCC |









































