Dear all,
I have been evaluating a few different simulation environments for PLL systems lately. As we are using a Texas Instruments PLL, the first choice has been PLLatinum SIM, as it is already loaded with the PLL model. I have set a sample simulation as shown below to evaluate the Lock Time of this specific set-up.
As you can see the transient response peaks at 2 usec and stabilizes to 1 KHz around 20 usec. Later, I tried to replicate this set-up in VSS and ADS software so we could be able to make some changes and implement the PLL in a more complex system. Simulations are as shown below and the results are identical in both Environments, but the response is different from that shown in PLLatinum SIM by an order of magnitude!
Simulation in VSS:
Simulation in ADS:
Results in ADS and VSS:
What are we doing wrong? Is there some effect that PLLatinum is taking in consideration that is not considered by VSS or ADS?
Kind Regards,
Alejandro.
