How to plot frequency vs control bits in virtuoso

Hello I was trying to understand https://www.semanticscholar.org/pape...4660a16d25887a and I would like to ask how could I plot figure 6 in spectre (frequency vs control bits/control word in general)? Thanks in advance!

Create bits source where input value is decimal by Verilog-A.

After that which is the analysis that should be done for plotting it? Could you please refer the steps ? Hb analysis with sweeping bit source will work in this case ?

Yes.
Create bit sorce by Verilog-A.