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This paper describes a method to generate automatically, transient simulation models from a higher-level transfer function specification. The specified transfer function can be a ratio of nlh order polynomials in the s-domain or z-domain. An appropriate state-variable model is derived from the transfer functions using the phase-variable technique. The simulation models are generated for the AT&T Bell laboratories mixed-mode (analog-digital) behavioral simulator. The programs gensims and gensimz are developed to automatically generate the behavioral models for both the s-domain and z-domain respectively. 12.2.1 IEEE 1992 CUSTOM INTEGRATED CIRCUIT § CONFERENCE0-7803-0246-x/92 $3.00 1992 IEEE

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This paper describes behavioral models for mixed-mode and multi-level simulation of phase-locked loops(PLLs). PLLs are a difficult class of systems to evaluate using conventional circuit simulators because of the mixed analog digital signals involved, and extensively long runtimes required to capture the performance. Behavioral modeling techniques and a mixed-signal simulator, the AT&T Bell Laboratories ADAMS simulator, are used to overcome these limitations.An all analog PLL is simulated at the behavioral level to measure the lock-in characteristics as well as the tracking range. A high-speed digital PLL is simulated at the behavioral level, as well as at a multi-level using device-level models for the phase detector, to measure the lock-in time and detect false locking.