Transient analysis of bang–bang phase locked loops for phase step inputs
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Regarding to the nonlinear nature of the bang–bang phase-locked loops (BBPLLs), its transient analysis is very complicated. In this paper, new equations are proposed, expressing transient behavior of the BBPLLs with first order filter in response to phase step input. This approach gives new insights into the transient behavior of the BBPLLs. Approximating transient response by a reasonable specific waveform; the loop transient time characteristics such as locking time, peak time, rise time and over shoot are derived with acceptable accuracy. The validity of the resulted equations is verified through simulations using MATLAB SIMULINK. Simulation results show the high accuracy of the proposed equations for BBPLLs transient behavior.
KeywordsBang–bang PLL Nonlinear operation Transient analysis CDR system
- 2.Walker, R. C. (2003). Designing bang–bang PLLs clock and data recovery in serial data transmission systems. In B. Razavi (Ed.), Phase locking in high-performance systems. Piscataway: IEEE Press.Google Scholar
- 5.Razavi, S.-B. (2001). High speed CMOS circuits for optical receivers. Boston: Kluwer Publishers.Google Scholar
- 14.Ogata, K. (1995). Modern control engineering (3rd ed.). Prentice Hall: Englewood Cliffs.Google Scholar
- 15.Musa, F. A., & Carusone, A. C. (2007). Modeling and design of multilevel bang–bang CDRs in the presence of ISI and noise. IEEE Trans I, 54(10), 2137–2147.Google Scholar