Typical transistor design parameter [W/L]

AI Thread Summary
A typical W/L value for a MOSFET transistor can vary significantly, but the discussion highlights a specific case where a channel length (L) of 0.0001 cm results in an impractically large width (W) of 20 cm, yielding a W/L ratio of approximately 200,000. The user questions whether W and L should be similar for optimal design. The conversation seeks insights on common W/L ratios encountered in practical applications. The need for more realistic values is emphasized, as the current calculations suggest an unrealistic transistor size. Understanding typical W/L values is crucial for effective MOSFET design.
beyondlight
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I would like to know a typical W/L value for a MOSFET transistor.

L = channel length
W = channel width/transistor width

I am currently designing L to be L = 0.0001 cm for a transistor.

Cox = 5nF
mobility 1155 cm^2/Vs
K = 0.583 mA/V^2

This gives W = 20 cm. But this is way to large for a single transistor and W/L = 200,000 roughly.

I guess W and L should be about the same for one transistor?
 
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Hi beyondlight. What is the range of W/L values you've come across in your web search for this detail?
 
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