Behavioral Modeling Phase-locked Loops for Mixed-Mode Simulation

Part of the The Kluwer International Series in Engineering and Computer Science book series (SECS, volume 364)


Phase-locked Loops(PLLs) are a class of feedback systems with wide range of applications. A PLL in its entirety can be viewed as a closed-loop servosystem, comprised of three major functional subsystems; 1) Phase detectors, 2) Loop filters and 3) Voltage/Current controlled oscillators. The overall characteristics of the phase-locked loop are dependent on the realization of individual subsystems which have mixed analog-digital implementations. In simulating a PLL, one has to deal with the mixed-signal nature of most implementations, as well as the problem of simulating the PLL over a large number of signal cycles. Long simulation run times plague the simulation of a PLL using a conventional simulator, sometimes making such simulation impractical. In the methodology described in this paper, these drawbacks are overcome by the use of behavioral models and a mixed-signal simulation platform. This paper presents a general mixed-mode behavioral simulation methodology and the derivation of behavioral simulation models for various kinds of PLLs. The top-down and bottom-up modeling paradigms are illustrated through the use of examples of actual PLL designs. The simulation models are generated for the AT&T Bell Laboratories mixed analog-digital simulator, ATTSLM.


Phase-locked loops behavioral modeling mixed-mode simulation modeling language description 


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Copyright information

© Kluwer Academic Publishers, Boston 1996

Authors and Affiliations

  1. 1.Coordinated Science LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.AT&T Bell LaboratoriesAllentownUSA

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