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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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A 300-MHz digitally compensated SAW oscillator.

W D Cowan¹, A R Slobodnik, G A Roberts

¹Rome Air Dev. Center, Hanscom AFB, MA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1988

Summary

This summary is machine-generated.

This study presents a digitally compensated surface-acoustic-wave (SAW) oscillator that significantly reduces temperature-induced frequency drift. The new method achieves precise frequency stability across a wide temperature range using digital circuitry and microprocessor control.

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Area of Science:

Electrical Engineering
Materials Science
Physics

Background:

Surface-acoustic-wave (SAW) oscillators exhibit inherent temperature sensitivity, leading to frequency variations.
Traditional compensation methods like ovens are bulky, power-hungry, and slow to stabilize.

Purpose of the Study:

To develop a digital compensation method for SAW oscillators to mitigate temperature-induced frequency drift.
To improve the stability and performance of SAW oscillators in variable temperature environments.

Main Methods:

A digitally compensated SAW oscillator (DCSO) was designed and tested at 300 MHz.
A novel temperature-sensing scheme using two SAW delay paths with differential temperature sensitivity on a single AT-cut quartz substrate was implemented.
Microprocessor control and simple digital circuitry were employed for compensation.

Main Results:

Frequency variation was reduced from +/-125 parts per million (ppm) to +/-1.4 ppm over a -23 to 75 degrees C temperature range.
The digital compensation method effectively minimized thermal resistance and time-constant issues inherent in temperature sensing.
The DCSO demonstrated advantages over ovenized systems, including fast warmup, reduced size, weight, and power consumption.

Conclusions:

Digital compensation offers a highly effective and practical solution for stabilizing SAW oscillator frequencies against temperature fluctuations.
This method presents a low-cost potential alternative to ovenized systems for applications requiring precise frequency control.
The DCSO technology can compensate for other frequency drift sources beyond temperature variations.