Timeline for Common Base Amplifier - Hybrid-Pi vs. T Model
Current License: CC BY-SA 3.0
2 events
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| Apr 28, 2011 at 0:55 | comment | added | Zhukov | That is the gain I get for the T model. For the hybrid-Pi model I get: Vo/Vi = (gmRlRpi) / (gm * Rs * Rpi + Rs + Rpi). The difference is that gm term on the bottom when the equation is simplified down. That extra term comes from when I solve for the currents coming into and out of the emitter. As the base is grounded Ve determines Vbe so I get: Ve/Rpi = gm(-Ve) + (Vs-Ve)/Rs The gm(-Ve) term propagates through and causes the gm * Rs * Rpi difference in the final answer. Thanks. | |
| Apr 27, 2011 at 22:12 | history | answered | MattyZ | CC BY-SA 3.0 |