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What's the point of measuring Ft for MOSFET?

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_RFIC_

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MOSFET is voltage drive device, what's the point of measuring Ft? And what is the usage of Ft for MOSFET?
 

ft is the gain-bandwidth-product of your transistor. it's a measure of how much time the electrons (for n-channel) need to arrive the drain after being injected from the source. The transit time equals to 1/(2*pi*Ft). A larger Ft usually means a higher transconductance gm and a lower noise figure.
 

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