UM  > 科技學院
An Open-Loop Multi-Phase Local-Oscillator Generation Technique
Kai-Fai Un; Pui-In Mak; Rui P. Martins
Source PublicationLow Power Emerging Wireless Technologies
Author of SourceReza Mahmoudi, Krzysztof Iniewski
PublisherCRC Press
Other Abstract

This chapter describes how an inverter-based open-loop four-/eight-phase local oscilator (LO) generator can be utilized to cover a wide spectrum and relax the speed requirement of the phase-locked loop (PLL) and voltage-controlled oscillator (VCO), when comparing with the conventional frequency-divider-based method. Many different types of multiphase LO/clock generators have been reported for wireless and wireline applications. Alternatively, a multiphase LO signals can be generated in an open-loop way by using a low noise LC VCO followed by a frequency divider. The block diagram of a four-phase LO generator is depicted. Although the phase noise can be substantially reduced by replacing all inverters with LC VCOs, the associated inductors occupy a significant part of the chip area. Moreover, the PLL and VCO will be more sensitive to parasitic capacitances, implying narrower locking and tuning ranges, respectively. Multiphase LO generators are critical blocks in modern wireless/wireline communication systems. Elementarily, a four-phase LO can be generated via a div-by-2 circuit.

Fulltext Access
Citation statistics
Document TypeBook chapter
CollectionFaculty of Science and Technology
AffiliationUniversity of Macau,Macau,China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Kai-Fai Un,Pui-In Mak,Rui P. Martins. An Open-Loop Multi-Phase Local-Oscillator Generation Technique:CRC Press,2013:233-248.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Kai-Fai Un]'s Articles
[Pui-In Mak]'s Articles
[Rui P. Martins]'s Articles
Baidu academic
Similar articles in Baidu academic
[Kai-Fai Un]'s Articles
[Pui-In Mak]'s Articles
[Rui P. Martins]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Kai-Fai Un]'s Articles
[Pui-In Mak]'s Articles
[Rui P. Martins]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.