Connecting ground and substrate in deep n-well process?

[ccw27]

Ground and Substrate

For bandgap in deep n-well process should I connect the ground and substrate together or not? Considering that there will be digital circuit as well.

Thanks

 

[ambreesh]

Re: Ground and Substrate

Substrate has to be connected to gnd, no other choice.
But Deep Nwell would have a p-tub to accomodate the NMOS and that Ptub could be connected to any potential as per design.

 

[layes2]

Re: Ground and Substrate

not to asubstrate
to a clean pin instead

 

[drasta]

Re: Ground and Substrate

You will nedd analog and digital groun separately or some filtring circuitry between analog and digital groun and than you can connect supstrate with grounds.

 

[blueant]

Ground and Substrate

should separate

 

[yibinhsieh]

Re: Ground and Substrate

In deep nwell process, you can put all your circuits in deep nwell and connect this deep nwell to a clean vdd pin. Then you can reject the noise from substrate.

Yibin