Optimization of drive-level in high stability low-noise OCXOs

Author

Abramzon, I. ; Tapkov, V. ; Baranushkin, S.

Author_Institution

Magic Xtal Ltd, Omsk, Russia

fYear

2004

fDate

23-27 Aug. 2004

Firstpage

742

Lastpage

747

Abstract

This paper describes results of an experimental study of the influence of driving current on aging rate and noise properties of OCXOs, based on SC-cut 3rd overtone crystals. During the study, two groups of 12 and 30 samples were tested under different conditions: first at a driving current raised step-by-step from 1.5 up to 3.0 mA; second at 3.0 mA sustained constant during the experiment. The tests did not show noticeable impact on aging using a driving current up to 2.5 mA, while the 3.0 mA current produced aging degradation for most units. The phase noise level at close-to-the carrier offset is not sensitive to drive level while the noise floor can be reduced to about -170 dBc at 3.0 mA exciting current.

Keywords

ageing; circuit optimisation; crystal oscillators; frequency stability; phase noise; 1.5 to 3.0 mA; SC-cut 3rd overtone crystals; aging degradation; drive-level optimization; driving current aging effects; frequency stability; high stability OCXO; low-noise OCXO; noise floor reduction; overtone cut crystal oscillators; phase noise; Aging; Crystals; Degradation; Frequency; Noise level; Oscillators; Phase noise; Sociotechnical systems; Stability; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exposition, 2004. Proceedings of the 2004 IEEE International

ISSN

1075-6787

Print_ISBN

0-7803-8414-8

Type

conf

DOI

10.1109/FREQ.2004.1418558

Filename

1418558