-
Tytuł:
-
An Odd Phase CDR With Phase Interpolator Trimming.
-
Autorzy:
-
Joshi, Archit
Sarkar, Mukul
-
Źródło:
-
IEEE Transactions on Circuits & Systems. Part II: Express Briefs; Jan2019, Vol. 66 Issue 1, p31-35, 5p
-
This brief presents an odd phase Bang–Bang phase detector-based CDR architecture that has a unique property that the clock phases sampling the data automatically become aligned to the center of the data. This eliminates both the residual phase error of the quadrature correction and the quadrature corrector loop itself. An adaptive closed loop weight trimming algorithm is proposed to suppress the non-linearity of phase interpolator (PI). With this algorithm, very high PI linearity is achieved. Additionally, the resulting linearity is maintained over process, voltage, temp. (PVT). A compensation method for the phase offsets of the multiphase clock going into the PI is proposed. Phase offset compensation reuses the same sensing block, which is used for PI trimming. After settling, a phase alignment error of of ≤ 1.7° is achieved. At 2.67-GHz clock frequency, the PI trimming achieves DNL ≤ 0.45 LSB and INL ≤ 0.43 LSB across PVT. The phase offsets to PI input are corrected to within ±2.5% of the ideal phase spacing. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Circuits & Systems. Part II: Express Briefs is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)