How to realize a floating diode in digital CMOS process?

[leonken]

floating diode cmos parasitic pnp

I need a forward biased diode in a pure digital CMOS process. The minus terminal of the diode must be floating.
The conventional method, such as p diffusion in nwell, exists the pnp transistor.

Any other method to realize a floating diode in digital cmos process?

 

[Hughes]

cmos floating diodes

Maybe you can use channel pnp with B shorted to C, or a PMOSFET with G conneted to S and B connected to D. But it has a parasitic vertical pnp transistor.

 

[leonken]

Maybe you can use channel pnp with B shorted to C, or a PMOSFET with G conneted to S and B connected to D. But it has a parasitic vertical pnp transistor.

What is a channle pnp in CMOS process?

 

[tonyo_guy]

I think that there is no way to have floating diode in pure digital cmos process without parasitic pnp transistor