| Autor: |
Cemile Duygu Ozturk, Oguz Demir, Gokhun Selcuk, Abidin Taskiran, G. Yesa Altun |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Applied Mechanics and Materials. 850:52-59 |
| ISSN: |
1662-7482 |
| DOI: |
10.4028/www.scientific.net/amm.850.52 |
| Popis: |
In this paper we investigate the lock time behavior of charge pump phase locked loops (CP-PLLs) which employ voltage controlled oscillators (VCOs) with non-linear frequency tuning characteristics. Since non-linear tuning characteristics leads to variable tuning gain (Kvco), we extend the state space analysis of PLLs to account for tuning gain variations. The frequency behavior is approximated by a polynomial which fits the equally spaced data points of tuning curve best in a least-square sense. We have analytically evaluated the integrals arising from high order terms in polynomial representation and migrated to state space analysis. The method is validated by simulating the lock-time process of a VCO with varying tuning gain and comparing the results with commercial PLL simulation software. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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