# Exercise 1.3-3

# 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? 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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1.3.3 Ohms Law and Classical Physics

Solution to Exercise 1.3-3

© H. Föll