Title :
A 10-Phase 270MHz 5000ppm spread spectrum clock generator
Author :
Lee, Won-Young ; Kim, Lee-Sup
Author_Institution :
Dept. of EECS, KAIST, Daejeon
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;
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
DOI :
10.1109/SOCDC.2008.4815751
