The biasing scheme of the CE amplifi er of Fig. P2.61 is similar to except that RC is replaced by a current source IBIAS. (Such a source, whose details we are omitting for simplicity, could be...

The biasing scheme of the CE amplifi er of Fig. P2.61 is similar to except that RC is replaced by a current source IBIAS. (Such a source, whose details we are omitting for simplicity, could be implemented with a pnp BJT, along the lines. With this modifi cation, the resistance seen by the collector can be made quite high, indicating that this circuit is capable of potentially high voltage gains. (a) Assuming F 5 100, VBE(on) 5 0.7 V, and VA 5 100 V, use the BJT large-signal and small-signal models to fi nd the dc collector voltage VC and the unloaded ac voltage gain voyvi . (b) Repeat if IBIAS is doubled to 2 mA. Comment on your fi ndings.