DocumentCode
2521709
Title
A digitally temperature-compensated crystal oscillator with minimized phase-shifts
Author
Moh, Kyung-goo ; Nam, Jong-ki ; Koh, Hwa-su ; Kim, Taek-moo ; Sohn, Jang-sub ; Eum, In-hwan ; Yoon, Hoon-mo ; Yoon, Byung-chun ; Hwang, Dong-hyuk ; Kim, Jong-shik
Author_Institution
R&D Div., Innosign Co. Ltd, Seoul, South Korea
fYear
2002
fDate
2002
Firstpage
599
Lastpage
603
Abstract
The phase shifts in the output signal, due to discrete nature of the load capacitance, have been analyzed for a Digitally Temperature Compensated Crystal Oscillator (DTCXO) with on-chip capacitor-switch arrays. Also a one-chip DTCXO with minimized phase shifts has been fabricated on a standard 0.25 μm CMOS process. The effect of phase shifts is minimized by employing charge-pump circuits. This shows a trimming accuracy of about 0.2 ppm, which is not degraded by process variations.
Keywords
CMOS analogue integrated circuits; compensation; crystal oscillators; 0.25 micron; charge-pump circuits; digitally temperature-compensated crystal oscillator; load capacitance; minimized phase shifts; on-chip capacitor-switch arrays; phase-jump phenomena; single-chip DTCXO; submicron CMOS process; CMOS process; Capacitance; Charge pumps; Degradation; Digital-controlled oscillators; Frequency; Phased arrays; SPICE; Switches; Switching circuits;
fLanguage
English
Publisher
ieee
Conference_Titel
Frequency Control Symposium and PDA Exhibition, 2002. IEEE International
Print_ISBN
0-7803-7082-1
Type
conf
DOI
10.1109/FREQ.2002.1075952
Filename
1075952
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