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Old 31st October 2008, 11:30 AM   #1
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Default SiGe transistors... who woulda thought?

http://www.edn.com/article/CA6594090...icon-germanium

interesting...... the best of both worlds

but they're only making digital logic and RF transistors with it.
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Old 31st October 2008, 11:50 AM   #2
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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.
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