A Modified Midtread Frequency Quantization Scheme for Digital Phase-Locked Loops

Heejin ROH  Kyungwhoon CHEUN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E87-B   No.3   pp.752-755
Publication Date: 2004/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment
Keyword: 
phase-locked loops,  quantization,  phase jitter,  cycle slip,  

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Summary: 
A novel modified midtread quantizer is proposed for number-controlled oscillator frequency quantization in digital phase-locked loops (DPLLs). We show that DPLLs employing the proposed quantizer provide significantly improved cycle slip performance compared to those employing conventional midtread or midrise quantizers, especially when the number of quantization bits is small and the magnitude of input signal frequency normalized by the quantization interval is less than 0.5.