If mos structure is symetric then why one n-region is called soure and another is drain
Answers
Answer:
manufactures conspire to put internal diodes in discrete components so only IC designers can do neat things with 4-terminal MOSFETs.
Truth: 4-terminal MOSFETs aren't very useful.
Any P-N junction is a diode (among other ways to make diodes). A MOSFET has two of them, right here:
MOSFET with diodes
That big chunk of P-doped silicon is the body or the substrate. Considering these diodes, one can see it's pretty important that the body is always at a lower voltage than the source or the drain. Otherwise, you forward-bias the diodes, and that's probably not what you wanted.
Answer:
Explanation: In NMOS two n regions will be there . One is source and other is drain. The one which is conn3cted to higher potential (Vdd) is drain and the one which is connected to lower potential (vss) is source .
It is called symmetric because rise time and fall time are equal, device ratio is unity and resistance of know and know are equal.