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difference between symmetric\asymmetric high voltage devices

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zarric

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high voltage devices?

what the difference between symmetric high voltage devices and asymmetric device.
if a design a nand, then the nmos is always need symmetric devices? or one nmos is asymmetic connected to gnd and the other is symmetric and how to layout this two devices in series?

and any other circuit use symmetric devices??

thanks
 

high voltage devices?

the symmetric Mosfets could bear the same Vgd and Vgs voltage while the asymmetric Mosfest could only bear a high Vgd voltage.
 

Re: high voltage devices?

Bottom transistors are asymmetric nmos devices.

14_1248189317.jpg
 

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