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I dont think that there is a standard calculation. It will depend on the switch design, for example a switch with a strong spring in it will have a different time to a switch with a weak spring. Why do you need this information? If you are reading the switch with a microcontroller you can use a timer interrupt that reads the switch every 10ms or even every 100ms depending on application. Alternatively a simple rc filter going into a schmitt trigger can also be used.
I want to design a bootstrapped switch with settling time of 10 ns. The error is 0.1%
ron is a property of the transistor, but I don't know what is the meaning of c in above formula. My cicuit doen't have any load.
what i understand is that you should confirm it's load capacitor firstly because the switch is used in switched-capacitor circuit. the settling time is that a voltage source spends it charging this load through switch. in your booststrapped switch the settling time should include the time that the battery capacitor charges parasitic capacitance of switch gate so the switch can be on.
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