A loading effect insensitive and high precision clock synchronization circuit

Kai Wei Hong, Kuo Hsing Cheng, Chi Hsiang Chen, Jen Chieh Liu, Chien Cheng Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

This study proposes a output loading effect insensitive and high precision clock synchronization (HPCS) circuit which can accept variable duty cycle clock signal. This HPCS is capable of synchronizing the external clock and the internal clock in 3 clock cycles. By using three innovative techniques, the proposed HPCS can also reduce the clock skew between the external clock and the internal clock in a chip. First, by modifying the mirror control circuit, the HPCS operates correctly with an arbitrary duty cycle (25% ∼ 75%) clock signal. Second, the HPCS works precisely and ignores the effect of output load changes by moving the measurement delay line beyond the output driver. Finally, the HPCS can enhance the resolution between the external clock and internal clock with a fine tuning structure. After phase locking, the maximum static phase error is less than 20 ps. The proposed chip is fabricated in a TSMC 130 nm CMOS process, and has an operating frequency range from 300 MHz to 600 MHz. At 600 MHz, the power consumption and rms jitter are 2.4 mW and 3.06 ps, respectively. The active area of this chip is 0.3x0.13 mm2.

Original languageEnglish
Title of host publicationESSCIRC 2010 - 36th European Solid State Circuits Conference
Pages514-517
Number of pages4
DOIs
StatePublished - 2010
Event36th European Solid State Circuits Conference, ESSCIRC 2010 - Sevilla, Spain
Duration: 14 Sep 201016 Sep 2010

Publication series

NameESSCIRC 2010 - 36th European Solid State Circuits Conference

Conference

Conference36th European Solid State Circuits Conference, ESSCIRC 2010
Country/TerritorySpain
CitySevilla
Period14/09/1016/09/10

Keywords

  • High precision
  • Synchronization circuit and synchronous mirror delay (SMD)
  • Variable duty cycle

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