Hello,
Here are my comments...
Cadence PCB SI solutions (SpecctraQuest)
No Frequency domain solver (Harmonic Balance) & No Electomagnetic Simulator (MOM) which required for critical signal integrity analysis....no distributed models
Ansoft AnsoftLinks+Q3D+HFSS+Designer+SIwave solutons
Ansoft has all but limitations in Layout& Schamtic simulations..
Again apart from EM solvers it lacks accuracy or covergence of Circuit or spice solvers...No industry standard HB or Spice simulator
ansoft nexxim has both spice solver and HB solver with very fast convergence speed. The SI simulation flow provided by ansoft is more complete and suitable than other companies.
Synopsys HSPICE
Good for transient simulations...No layout tool or environment
Agilent ADS
This is not a complete SI tool, it is only a EM SImulator & HB...Again lacks layout environment even though it exists it is not powerful...
Lacks lot of signal integrity toools
Mentor Graphics ADMS
Good SI tool but limited to PCB designs upto 800MHz...no distributed models
Again lacks frequency domain & EM simulators...
Sigrity Speed 2000
again it lacks Frequency domain analysis capability...no distributed models
One more new addition to this is AWR SI Design environment..
which as built in HSPICE, good HB, EM & Layout environments for complete SI solution for high frequency PCBs...
---manju---