DocumentCode :
2871207
Title :
An adjustable design with component tolerance for the Real Time Clock of high-end server systems
Author :
Chen, Hsiao-Chung ; Bai, Ying-Wen
Author_Institution :
Grad. Inst. of Appl. Sci. & Eng., Fu Jen Catholic Univ., Taipei, Taiwan
fYear :
2011
fDate :
7-10 Nov. 2011
Firstpage :
468
Lastpage :
473
Abstract :
The method we described in this paper is an adjustable design method for more environmental temperature tolerance both with considered components tolerance and temperature characteristics of a Real Time Clock (RTC) circuit on a high end server system. The current RTC source is used on server system categories with a crystal unit, SPXO and TCXO, of which crystal unit is usually used to provide a cost benefit. We propose to reduce those factors which may affect the RTC circuit, such as the PCB (Printed Circuit Board) stack-up, the parasitic capacitance of the PCB trace layout, the equivalent capacitance of the chipset and crystal unit, and also the temperature characteristics of a BT section crystal unit. We enumerate major factors and come up with an external load capacitor value to provide the load capacitance which the oscillator circuit actually needs, to make the RTC clock rate more accurate. And we consider the tolerance of the RTC oscillator circuit and the temperature characteristics of a crystal unit in order to obtain larger design tolerance.
Keywords :
clocks; network synthesis; oscillators; BT section crystal unit; PCB stack-up; PCB trace layout; RTC circuit; RTC clock rate; RTC oscillator circuit; SPXO; TCXO; component tolerance characteristics; environmental temperature tolerance; external load capacitor value; high-end server systems; printed circuit board stack-up; real time clock circuit; temperature characteristics; Capacitance; Capacitors; Crystals; Layout; Oscillators; Resonant frequency; Temperature;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society
Conference_Location :
Melbourne, VIC
ISSN :
1553-572X
Print_ISBN :
978-1-61284-969-0
Type :
conf
DOI :
10.1109/IECON.2011.6119356
Filename :
6119356
Link To Document :
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