# A low-jitter open-loop all-digital clock generator with two-cycle lock-time

Moo Young Kim, Dongsuk Shin, Hyunsoo Chae, Chulwoo Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

### Abstract

A portable clock generator, which solves the duty ratio and jitter problems of the input clock, has been developed. In the proposed clock generator, the complementary delay line generates a series of multiphase clocks. The 0-to-1 transition detector finds the 2 $\pi$ phase delayed position among the multiphase clocks produced by the complementary delay line, and then, the select signal generator chooses the proper path to generate the delayed output clock. As a result, the proposed open-loop and full-digital architecture achieves a fast lock time of two clock cycles. Also, it is a simple, robust and portable IP and consumes only 17 mW at an input clock frequency of 1.6 GHz. In addition, a complementary delay line is implemented to achieve high phase resolution over a wide frequency range. The proposed clock generator is implemented in a 0.18- μm CMOS process and, occupies an active area of 170 μm times 120 μm. Also, it operates at various input frequencies ranging from 800 MHz to 1.6 GHz.

Original language English 4801531 1461-1469 9 IEEE Transactions on Very Large Scale Integration (VLSI) Systems 17 10 https://doi.org/10.1109/TVLSI.2008.2004591 Published - 2009 Oct 1

### Fingerprint

Jitter
Clocks
Electric delay lines
Signal generators
Detectors

### Keywords

• Clock generator
• Clock-on-demand
• Lock time
• PLL
• Portable

### ASJC Scopus subject areas

• Electrical and Electronic Engineering
• Hardware and Architecture
• Software

### Cite this

A low-jitter open-loop all-digital clock generator with two-cycle lock-time. / Kim, Moo Young; Shin, Dongsuk; Chae, Hyunsoo; Kim, Chulwoo.

In: IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Vol. 17, No. 10, 4801531, 01.10.2009, p. 1461-1469.

Research output: Contribution to journalArticle

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