Why is BJT faster than MOS?
Answer:
BJT is not really faster than MOS technology. You probably are comparing apples to oranges and don't realize it. MOS is a dense gate technology, and it's desiged to be ultra super cheap per transistor, which means silicon. The limit of silicon is about 6Ghz, so you will see performances dropping off even before that. Now lots of BJT's are made with SiGe or other exotic combinations, and the hole speeds are not as limited- so they can run much faster, but are more expensive.
If you were to run the same process on the same material you would find the two technologies to be about the same speed, but otherwise, thats why your BJT is faster.
Is it really...?!
I would have thought that BJT is slower due to the limitation associated with the contribution of electrons and holes to achieve conduction which requires more time to switch, the consequence of which is less bandwidth.
Don't trust me?
Then read this:
http://www.ee.bilkent.edu.tr/~eee314/dow...
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