How to speed up PLL simulation with H$IM?

[cqmyg5]

hi,

I am simulating a 2.4G PLL with H$IM, but ".tran 2n 150us" will cost about 20 hours. How to speed up? I tried to set 'hsimanalog=1' at the top-level and 'hsimanalog=2' at vco sub-circuit, but this made the vco could not oscillate.

if set 'hsimanalog=2' at the top-level, vco could oscillate, but the simulation is too slow.


if precision can be sacrificed, how to speed up PLL simulation with H$IM?

 

[Btrend]

1. try hsimspice=3 at the VCO block
2. since ur PLL is 2.4GHz, so the period is just 0.417 ns , why can u use 2n in the .tran ? although it is intended for resolution of plotting waveform, but it also served as a "suggested increment" during simulation. try to increasing resolution from 2n to 0.01n

 

[sunking]

You can added a initial condition then the analysis time will be like that:
.tran 2n 10u

 

[thcm]

go to web:
https://www-mtl.mit.edu/researchgroups/perrottgroup/tools.html
here,perrott provides a very fast PLL evaluation tool--cppsim,i have used it,it's perfect!