a.akbari61
Junior Member level 3
Hi everybody
I have some questions and need your help:
1- why body connection is important? (I know one of the reasons. see q.3)
2- I have designed a simple circuit at schematic level. I have connected the bodies of
all mosfets to correct voltage level. I use LayoutXL in cadence to create the layout. it
uses pcells to do this, but the mosfets has no body connections. Why?
3- I know that the voltage difference between body and source affects the threshold
voltage of MOS. I have seen some layout examples in internet. I wonder
why there is no body connection for mosfets at these examples?
4- when we want to use an NMOS as a transmission gate , should we connect the
body to GND? (there would be voltage difference between source and body anyway) (I stopped at layout stage because I don't know the answer of this question!)
Thanks a lot
I have some questions and need your help:
1- why body connection is important? (I know one of the reasons. see q.3)
2- I have designed a simple circuit at schematic level. I have connected the bodies of
all mosfets to correct voltage level. I use LayoutXL in cadence to create the layout. it
uses pcells to do this, but the mosfets has no body connections. Why?
3- I know that the voltage difference between body and source affects the threshold
voltage of MOS. I have seen some layout examples in internet. I wonder
why there is no body connection for mosfets at these examples?
4- when we want to use an NMOS as a transmission gate , should we connect the
body to GND? (there would be voltage difference between source and body anyway) (I stopped at layout stage because I don't know the answer of this question!)
Thanks a lot