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switching speed... and the switch driver

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sharkies

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let's say I have two switches that I need to turn on/off
first switch has size of 200n/100n
second switch has size of 1u/100n
I want to make sure that the switching speed of these two transistors are the same.

Therefore, I would have to increase the driver size for the second switch since the second switch is bigger than the first switch.

In this case, how do I make sure the driver is sized appropriately so that the switching speed is the same? Can this be checked by simple transient?
 

Sure, why not? Both directions (on/off), and with the actual load(s), of course!
 

Do a simple tran.. measure the input cap of both the switches or just the second switch.. that can be considered as the load for the prev stage..and then resize your previous stage to meet ur timing.
 

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    sharkies

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how do I measure input cap? and when you say input timing, are you just refering to the rise time and fall time of the input signal to the switch?
 

Make your 1u/100n switch with 5 200n/100n and use the same driver 5 times for the bigger one. Try to match the routing capacitance as well.
 

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