Hi, i am working on 3-5V supply voltage, i cant able to find pfet 3V or pfet 5V transistors, although nfet 3-5V transistors are present. Is there any specific reason for that why they are not in skywater-130nm. Is there any alternative which i can use for high speed circuit designs.

Are you using the

sky130_fd_sc_hvl

library?

No, I am using sky130_fd_pr library. I searched all the models, pfet_03v3 and pfet_05v0 are not present.

How about

pfet_g5v0d10v5

? The

nfet_03v0_nvt

and

nfet_05v0_nvt

are native Vth versions and don't have a corresponding pfet model. See https://skywater-pdk.readthedocs.io/en/main/rules/device-details.html#spice-model-information

@Muhammad Jawad: The thick oxide layer is good for 5V devices; there are not specifically any 3V devices. The naming convention

g5v0d10v5

means 5V max gate voltage, 10.5V max drain voltage. I don't particularly like the nomenclature.

@Tim Edwards @Mitch Bailey, thank you for your inputs. I think this is something similar to ldmos technology, i will also see the layout to explore more. I will design some basic designs, inverter, comparator to explore its working on skywater-130.

This is not an LDMOS. It is simply a thick oxide FET.

Thank you @Tim Edwards. This is something need to be discussed with my team, 😅 as we made our project specifications according to 5V supply circuit, operating at 100 MHz.