A spread spectrum clock generator using digital modulation scheme

This paper describes a new architecture of the spread-spectrum clock generator (SSCG) using direct digital modulation scheme on VCO. Differing from the conventional technique by altering the control voltage of VCO, the modulating operation is performed by the selection of multi-band VCO. The propose...

Full description

Saved in:
Bibliographic Details
Main Authors: Chorng-Sii Hwang, Huan-Chun Li, Hen-Wai Tsao
Format: Conference Proceeding
Language:English
Subjects:
Clocks
Frequency conversion
Frequency modulation
Generators
Modulation
Voltage control
Voltage-controlled oscillators
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper describes a new architecture of the spread-spectrum clock generator (SSCG) using direct digital modulation scheme on VCO. Differing from the conventional technique by altering the control voltage of VCO, the modulating operation is performed by the selection of multi-band VCO. The proposed SSCG test chip has been fabricated by CMOS 0.18mum 1P6M process. The operating frequency range is within 680~1,080MHz with the center-spread setting of 0.5% and 1%. The chip area is 0.68mm 2 . The peak reduction at 800MHz output clock can achieve 10.61dB and 12.52dB for ratios of 0.5% and 1%, respectively. The power consumption is 12mW at 800MHz.
ISSN:2164-1676
2164-1706
DOI:10.1109/SOCC.2008.4641540