the difference of the mos diode and the bulk-drain diode

[carlson]

difference between pn diode and mos diode

Hi all,
I have a question about the difference between the mos diode and the mos parasitic diode(bulk-drain) in the discharge path. why did the mos diode be put in the discharge path,if the pn junction had existed in the discharge path?

Thanks

 

[Areky_qin]

bulk-drain diode

Added after 6 minutes:

the parastic diode can not decide the discharge performance, but the mos diode can do it.

 

[carlson]

Thanks.
And what is difference of the performance between the two types of diode ?
for example, charge(or discharge) capacity

 

[wonbef]

i think mos diode is better