Beta multiplier and bias circuit with sky130 open pdk

This repo presents the beta multiplier with a bias circuit using Google-skywater 130nm pdk that generates 40μA bias current with a supply voltage of 3.3V for biasing some analog circuits.

EDA tools and PDK

EDA tools are used in this repo as follows:

netlist SPICE simulation

schematic capture

Skywater 130nm techology is used. Techology SkyWater SKY130 PDK

Requirement

assumed already install ngspice, xschem along the SKY130 PDK

In order to simulate the design, xschemrc and spinit files should be linked to xschem file in this repo.

ln -s /usr/local/share/pdk/sky130A/libs.tech/xschem/xschemrc
ln -s /usr/local/share/pdk/sky130A/libs.tech/ngspice/spinit .spiceinit

1) Beta Multiplier

Schematic

Results

Operating point analysis (op)

Supply variation analysis

               

2) Bias Circuit

Schematic

Results

Operating point analysis (op)

References

$[1]$ Xschem manual https://xschem.sourceforge.io/stefan/xschem_man/xschem_man.html

$[2]$ ngspice manual https://ngspice.sourceforge.io/docs.html

$[3]$ R. J. Baker, CMOS: Circuit Design Layout and Simulation, Hoboken, NJ, USA:Wiley, 2019.