Non-linear behaviour of charge-pump phase-locked loops
The analysis of the mixed analogue and digital structure of charge-pump phase-locked loops (CP-PLL) is a challenge in modelling and simulation. In most cases the system is designed and characterized using its continuous linear model or its discrete linear model neglecting its non-linear switching be...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2010-10-01
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| Series: | Advances in Radio Science |
| Online Access: | http://www.adv-radio-sci.net/8/161/2010/ars-8-161-2010.pdf |
| Summary: | The analysis of the mixed analogue and digital structure of charge-pump
phase-locked loops (CP-PLL) is a challenge in modelling and simulation. In
most cases the system is designed and characterized using its continuous
linear model or its discrete linear model neglecting its non-linear switching
behaviour. I.e., the time-varying model is approximated by a time-invariant
representation using its average dynamics. Depending on what kind of phase
detector is used, the scopes of validity of these approximations are
different. Here, a preeminent characterization and simulation technique based
on the systems event-driven feature is presented, merging the logical and
analogue inherent characteristics of the system. In particular, the
high-grade non-linear locking process and the dead-zone are analyzed. |
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| ISSN: | 1684-9965 1684-9973 |