A digitally temperature-compensated crystal oscillator with minimized phase-shifts

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...

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Bibliographic Details
Main Authors: 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
Format: Conference Proceeding
Language:English
Subjects:
Applied sciences
Capacitance
Charge pumps
Circuit properties
CMOS process
Degradation
Digital circuits
Digital-controlled oscillators
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Oscillators, resonators, synthetizers
Phased arrays
SPICE
Switches
Switching circuits
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Summary: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 /spl mu/m 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.
DOI:10.1109/FREQ.2002.1075952