A temperature-compensated low-noise digitally-controlled crystal oscillator for multi-standard applications

This paper presents an integrated 26-MHz digitally-controlled crystal oscillator (DCXO) with temperature compensation function for multi-standard cellular applications, that achieves a phase noise of -154 and -159 dBc/Hz at 10 kHz and 100 kHz offset, respectively. The frequency instability over temp...

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Bibliographic Details
Main Authors: Ming-Da Tsai, Chih-Wei Yeh, Yi-Hsien Cho, Ling-Wei Ke, Pei-Wei Chen, Guang-Kaai Dehng
Format: Conference Proceeding
Language:English
Subjects:
Automatic frequency control
Capacitors
Circuits
CMOS technology
Crystal oscillator
DCXO
digital trimming
GSM
Multiaccess communication
Oscillators
Phase noise
temperature compensation
Temperature sensors
Tuning
VCTCXO
VCXO
WCDMA
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Description
Summary:This paper presents an integrated 26-MHz digitally-controlled crystal oscillator (DCXO) with temperature compensation function for multi-standard cellular applications, that achieves a phase noise of -154 and -159 dBc/Hz at 10 kHz and 100 kHz offset, respectively. The frequency instability over temperature is compensated by built-in temperature sensor and compensating capacitor. The frequency instability from -10 to 55 degC is about +/- 1 ppm. The AFC frequency tuning is done by a digitally-controlled metal-oxide-metal capacitor array that is 13-bit thermometer decoded. The DCXO is implemented in a 0.13-mum CMOS technology.
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2008.4561493