For some applications the body diode of the mosfet is desired but how to make it forwarded without turning the parasitic bjt on ? The bjt's base is the body and to turn the diode on we must give its anode a voltage higher than its cathode and the diode's anode is the body so we must give the body a voltage to turn the diode on but that will turn the bjt on too and the mosfet will not operate correctly then how in some applications the body diode turns on ??
Edited :
![enter image description here](https://i.stack.imgur.com/BL5L8.jpg)
This is the same structure TemeV used and here is my question : if the substrate for some reason wasn't shorted to source because some mosfets have a substrate terminal non shorted now that means the anode of the diode and the base of the transistor will have the same voltage on them and if the diode turned on wouldn't the bjt turn on too ? If it does then turning the diode means that no current will pass from d to s and it will all pass through the diode