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Effects of On Resistance (RON) to an Analog Switch

Authored on: Aug 11, 2003

Technical Paper

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There are many factors that affect RON such as temperature, input voltage, supply voltage, and gate length "W". Optimizing the performance of a MOSFET as an analog switch requires a number of trade-offs. If the Width/Length ratio is increased to reduce RON the parasitic capacitance of the gate oxide will increase proportionately resulting in lower bandwidth.

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