A 300-MHz digitally compensated SAW oscillator

Author

Cowan, W.D. ; Slobodnik, A.J., Jr. ; Roberts, G.A. ; Silva, J.H.

Author_Institution

Rome Air Dev. Center, Hanscom AFB, MA, USA

Volume

35

Issue

3

fYear

1988

fDate

5/1/1988 12:00:00 AM

Firstpage

380

Lastpage

385

Abstract

A method for compensating for the inherent temperature sensitivity of surface-acoustic-wave (SAW) oscillators is described. Results for a 300-MHz digitally compensated SAW oscillator (DCSO) show a reduction of temperature-induced frequency variation from +or-125 parts per million to +or-1.4 parts per million over the temperature range of -23 to 75 degrees C. This is accomplished using simple digital circuitry and microprocessor control. The temperature-sensing scheme, using a SAW structure with two delay paths of different temperature sensitivity on the same AT-cut quartz substrate, virtually eliminates thermal resistance and time-constant problems. Advantages over ovenized systems include fast warmup; reduced size, weight, and power dissipation; low cost potential; and the ability to compensate for other sources of frequency drift.<>

Keywords

crystal resonators; frequency control; surface acoustic wave devices; -23 to 75 degC; 300 MHz; AT-cut quartz substrate; SAW oscillator; digitally compensated; frequency drift; frequency variation; microprocessor control; temperature sensitivity; Circuits; Delay; Frequency; Microprocessors; Oscillators; Power dissipation; Surface acoustic waves; Temperature distribution; Temperature sensors; Thermal resistance;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.20458

Filename

20458