http://www.edn.com/article/CA6594090.html??text=silicon-germanium
interesting...... the best of both worlds
but they're only making digital logic and RF transistors with it.
interesting...... the best of both worlds
but they're only making digital logic and RF transistors with it.
There are a couple of mixed signal SiGe processes out there; and I think somebody (from memory TI) is even shipping some op-amps that use it. A quick google shows that the THS4304, OPA211 and OPA827 all use SiGe.
The new degree of freedom that it gives is to combine a change in doping with a change in bandgap; the main advantage is seen in HBT (Heterojunction Bipolar Transistors), where the SiGe is used in the base.
The new degree of freedom that it gives is to combine a change in doping with a change in bandgap; the main advantage is seen in HBT (Heterojunction Bipolar Transistors), where the SiGe is used in the base.
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