A 10-Phase 270MHz 5000ppm spread spectrum clock generator

Author

Lee, Won-Young ; Kim, Lee-Sup

Author_Institution

Dept. of EECS, KAIST, Daejeon

Volume

03

fYear

2008

fDate

24-25 Nov. 2008

Abstract

This paper presents the spread spectrum clock generator which reduces EMI. The proposed spread spectrum clock generator consists of a basic PLL, a voltage-controlled oscillator (VCO) controller, the frequency modulator, and voltage reference. The output clock frequency of the proposed clock generator is 10-phase 270 MHz and 162 MHz frequency is also supported. A phase noise of the proposed clock generator is -67.5 dBc/Hz at 45 kHz in 270 MHz mode and -72 dBc/Hz at 30 kHz in 162 MHz mode. 8.75 dBm of the peak reduction and 0.5% of spread ratio achieved.

Keywords

MOSFET; capacitors; clocks; electromagnetic interference; phase locked loops; phase noise; system-on-chip; voltage-controlled oscillators; EMI; MOSFET capacitor; PLL; VCO; clock generator; frequency 162 MHz; frequency 270 MHz; frequency modulator; output clock frequency; peak reduction; phase noise; spread ratio; spread spectrum clock generator; system-on-chip; voltage reference; voltage-controlled oscillator controller; Capacitance; Capacitors; Clocks; Electromagnetic interference; Frequency; MOSFET circuits; Phase locked loops; Spread spectrum communication; Threshold voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

SoC Design Conference, 2008. ISOCC '08. International

Conference_Location

Busan

Print_ISBN

978-1-4244-2598-3

Electronic_ISBN

978-1-4244-2599-0

Type

conf

DOI

10.1109/SOCDC.2008.4815751

Filename

4815751