“Ron*Coff

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Ron Coff product determines how good a switch is. Lower the number is better will the switch be.
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Looking at this number for a switch in a given technology, you can get an idea of how good is the technology.
 

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in power FET, Ron is on-state resistance (source to drain), and Coff is off-state capacitance (source to drain).

Ron is inversely proportional to gate width W, and Coff is proportional to W - so their product is an important FOM (figure of merit), independent of gate width.
 

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