The Oscillation Frequency of CML-based Multipath Ring Oscillators

A novel phase interpolator (PI) based linear model of multipath ring oscillator (MPRO) is described in this paper. By modeling each delay cell as an ideal summer followed by a single pole RC filter, the oscillation frequency is derived for a 4-stage differential MPRO. It is analytically proved that...

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Bibliographic Details
Published inJournal of semiconductor technology and science Vol. 15; no. 6; pp. 671 - 677
Main Authors Song, Sanquan, Kim, Byungsub, Xiong, Wei
Format Journal Article
LanguageEnglish
Published 대한전자공학회 01.12.2015
Subjects
전기공학
oscillation criterion
Oscillator
multipath ring oscillator
oscillation frequency
oscillation mode
forwarding factor
mode gain
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Summary:A novel phase interpolator (PI) based linear model of multipath ring oscillator (MPRO) is described in this paper. By modeling each delay cell as an ideal summer followed by a single pole RC filter, the oscillation frequency is derived for a 4-stage differential MPRO. It is analytically proved that the oscillation frequency increases with the growth of the forwarding factor α, which is also confirmed quantitatively through simulation. Based on the proposed model, it is shown that the power to frequency ratio keeps constant as the speed increases. Running at the same speed, a 4-stage MPRO can outperform the corresponding single-stage ring oscillator (SPRO) with 27% power saving, making MPRO with a large forwarding factor α an attractive option for lower power applications. KCI Citation Count: 1
Bibliography:G704-002163.2015.15.6.006
ISSN:1598-1657
2233-4866
DOI:10.5573/JSTS.2015.15.6.671