A digitally temperature-compensated crystal oscillator

Citation
R. Achenbach et al., A digitally temperature-compensated crystal oscillator, IEEE J SOLI, 35(10), 2000, pp. 1502-1506
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE JOURNAL OF SOLID-STATE CIRCUITS
ISSN journal
0018-9200 → ACNP
Volume
35
Issue
10
Year of publication
2000
Pages
1502 - 1506
Database
ISI
SICI code
0018-9200(200010)35:10<1502:ADTCO>2.0.ZU;2-U
Abstract
The base frequency of oscillators used in the Global System for Mobile Comm unication (GSM) network or Global Positioning System (GPS) receiver applica tions needs to be very stable with respect to temperature and supply-voltag e variations. One approach to obtain extremely good frequency stability is the use of oven-stabilized crystal oscillators, With this kind of oscillato r, a frequency stability versus temperature of a few ppb versus the standar d temperature range can be achieved. In this paper, a digitally compensated crystal oscillator is described. The system provides a frequency stability of (Delta f)/f < 1.5 ppm for a temperature range of -40 degrees C to 90 de grees C compared to about +/-20 ppm for a noncompensated crystal. The core of the system is an applicalion-specified integrated circuit (ASIC) fabrica ted in a standard 0.8-mu m CMOS process. The power consumption for the osci llator running at 13 MHz is 100 mW. The final device equipped with the ASIC , crystal blank, and a few external components fits into a 14 x 9 x 3 mm(3) package.