Installing the SkyWater 130nm Design Kit

We will install the SkyWater 130nm design kit via the Open_PDKs scripts. This allows us to install (1) the Google/SkyWater SKY130 PDK from github and compile the timing files, (2) 3rd-party alphanumeric layout libraries, and (3) 3rd-party libraries for the xschem schematic entry and schematic capture tool.

Prerequisites

For installing the files needed by the Magic layout tool, Magic must be installed. Download Magic here or via

git clone https://github.com/RTimothyEdwards/magic

Then follow the compile and install instructions.

Installing the PDK

After installing Magic, we can now download the PDK via:

git clone git://opencircuitdesign.com/open_pdks

See the full installation instructions at the Open_PDKs website.

Using the PDK SPICE Models

Once we have downloaded the PDK, we can now use ngspice to plot the transistor transfer and output characteristics. Let us use this [SPICE deck]:

 1 * SKyWater 130nm Test Simulation
 2 
 3 .option scale=1e-6
 4 .lib /usr/local/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
 5 
 6 
 7 xm01 	d1 g1 0 0 	sky130_fd_pr__nfet_01v8 l=0.15 w=10
 8 
 9 vds1 	d1 0		1.8
10 vgs1 	g1 0 		1.8
11 
12 xm02 	d2 g2 vdd vdd	sky130_fd_pr__pfet_01v8 l=0.15 w=25
13 eds2 	vdd d2 d1 0	1
14 egs2 	vdd g2 g1 0	1
15 
16 vsup 	vdd 0 		1.8	
17 
18 .control
19 * Transfer Characteristics
20 dc vgs1 0 1.8 0.01
21 plot (-i(vds1)) (-i(eds2))
22 
23 * Output Characteristics
24 dc vds1 0 1.8 0.01 vgs1 0.2 1.8 0.2
25 plot (-i(vds1)) (-i(eds2))
26 
27 .endc
28 
29 .end