A DCO Gain Estimation Algorithm for Digital Phase Locked Loops

Conference: European Wireless 2013 - 19th European Wireless Conference
04/16/2013 - 04/18/2013 at Guildford, UK

Proceedings: European Wireless 2013

Pages: 4Language: englishTyp: PDF

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Li, Jing; Hagelauer, Richard (Research Institute for Integrated Circuits, Johannes Kepler University Linz, Linz, Austria)
Mayer, Thomas; Tertinek, Stefan; Wicpalek, Christian; Neurauter, Burkhard (DMCE GmbH & Co KG (majority owned by Intel Mobile Communications), Linz, Austria)

An adaptive DCO (Digital Controlled Oscillator) gain tracking algorithm for an ADPLL (All Digital Phase Locked Loops), which is working as a frequency synthesizer, is presented in this paper. By using this DCO gain real-time tracking method, the requirement of DCO linearity and the complexity of the circuits can be highly decreased. The result shows that with introducing a small amount of training signal the actual DCO gain can be accurately estimated in short time with a fine resolution and the EVM (Error Vector Magnitude) performance is improved significantly. Index Terms — DCO Gain Estimation, All Digital Phase Locked Loops, Adaptive Tracking