I'm reading code from Paul Muller, which is available from this web site.
However, the part on sj_src is pretty strange. Why in quoted line need to multiply freq and sj_freq twice? Is it a typo?


architecture bhv of sj_src is
     constant sj_tau : time := 10ps;
     quantity vsj_out across isj_out through sj_out;
     quantity vsj_int : voltage;
begin
     -- All quantities considered in a 50 Ohm environment
     -- Voltage source is 2 * effective voltage
     -- sj_amp is considered a PP voltage
     -- output signal is centered around Vdd/2=0.0V
Quote:

     vsj_out == vsj_int + isj_out * 50.0;
end bhv;