A Novel False Lock Detection Technique for a Wide Frequency Range Delay-Locked Loop

Yasutoshi AIBARA  Eiki IMAIZUMI  Hiroaki TAKAGISHI  Tatsuji MATSUURA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A   No.2   pp.385-390
Publication Date: 2006/02/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.2.385
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
delay-locked loop (DLL),  false lock,  frequency range,  duty cycle,  digital camera,  

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Summary: 
A false lock free delay-locked loop(DLL) achieving a wide frequency operation and a fine timing resolution is presented. A novel false lock detection technique is proposed to solve the trade-off between a wide frequency range and false locks. This technique enables a fine timing resolution even at a high frequency. In addition, the duty cycle of the input clock is not required to be 50%. This technique is applied to the DLLs in analog front-end LSIs of digital camera systems, with a range of 465 MHz (16) and a timing resolution of 9(40 stages).