MOSFET question.

[SeanHatch]

What are the implications of connecting the bulk of a p-channel mosfet to a +Vdd. Up until now, we've only had examples where the bulk has been shorted to the source of the mosfet, or shorted to ground. I don't know how a bulk voltage changes the source voltage or the drain voltage.

Thanks for your help

 

[Papabravo]

The bulk or substrate has no problem forming additional pn junctions with regions that it is in contact with. The idea is usually to render those junctions ineffective in influencing the operation of the device.