Exercise 2.1-3

What does it take to build a 4 GhZ Microprocessor?

A typical MOS transistor of 200x (x = 0 .... 5) vintage has a "gate length" (= distance between source an drain) of about 0.5 µm and is run at about 3 V
1.) What is the mobility the material (= semiconductor) must have for 4 GHz operation frequency? Discuss the result for known mobility values and consider the following points
  • Transistor speed = device speed ??
  • Mobility range for a given material ??
  • Could we have powerful PCs without micro- or nanotechnology ??
2.) How could you increase the speed for a given material
  • In principal?
  • Considering that there limits. e.g. to field strengths?
 
Solution


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gehe zu 2.1.2 Ohms Law and Classical Physics

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