Emmi Wyttenbach02/08/2023, 10:59 PM
Tim Edwards02/09/2023, 3:10 AM
is a diode between P-diffusion and N-well.
is a diode between N-diffusion and P-well (or P-substrate). The geometry will affect the breakdown somewhat because of voltage gradients across the device, especially if you don't have it properly contacted, but otherwise you can expect that roughly the same voltage occurs over the whole area of the diode, so area will only affect the amount of current through the diode, not the breakdown voltage. Breakdown voltages are in the documentation; see https://skywater-pdk.readthedocs.io/en/main/rules/device-details.html#id74 section Diodes. There is a table of breakdown voltages there. Most breakdown voltages are in the 10-12V range. This should also match breakdown voltages in the SPICE models which is, I think, `VB`; e.g., for a standard installation of open_pdks, you could find such information in
, which matches
vb = 11.7
or N+ breakdown voltage in the table referenced above).
Jon Ho02/09/2023, 1:43 PM
Tim Edwards02/09/2023, 1:48 PM