Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Patent
1982-04-08
1984-12-18
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
331176, 333155, 310313A, H03H 925, H03B 532, H03L 102
Patent
active
044892896
ABSTRACT:
The inherent temperature instability of surface acoustic wave (SAW) clock oscillators is improved by the use of a thermometer oscillator circuit that senses temperature changes in the SAW substrate. The thermometer oscillator is used in combination with a calibrated programmable read only memory and a logic circuit and provides frequency corrections to the clock oscillator. The basic device is an oscillator clock circuit using a SAW substrate having a delay path orientation with good temperature stability. A second oscillator, the thermometer oscillator circuit, and the electronic compensation scheme are added in order to produce minimum temperature coefficient of delay over all temperatures in the range of interest. The thermometer oscillator delay path utilizes a high temperature coefficient of delay orientation of the same SAW substrate and at an appropriate angle to the clock oscillator delay path orientation. Its frequency of oscillation is used as a highly accurate thermometer in order to control a correction signal applied to a variable phase shifter in the clock oscillator loop.
REFERENCES:
patent: 3886484 (1975-05-01), Dias et al.
patent: 3889205 (1975-06-01), Mitchell
patent: 4193045 (1980-03-01), Houkawa et al.
patent: 4272742 (1981-06-01), Lewis
A Miniature High Stability TCSO Using Digital Compensation, Mroch and Hykes, Proc. Frequency Control Symposium, 1976.
Temperature Compensation of Crystals with Parabolic Temperature Coefficients, Kinsman, Proc. Freq. Control Symposium, 1978.
The Frequency Shifting Synthesizer, Warwick, Prescott and Gosling, The Radio and Electronic Engineer, 1980.
Dual Mode Operation of Temperature and Stress Compensated Crystals, Kusters, Fischer and Leach, Proc. Frequency Control Symposium, 1978.
A SAW Temperature Compensated Oscillator Using the Difference Between Metallized and Free Delay Temperature Coefficients on LITA03, Henaff and Feldman, Ultrasonics Symposium Proceedings, 1978.
Colvin Roger D.
Slobodnik Andrew J.
LaRoche Eugene R.
Matthews Willard R.
Paxman W. R.
Singer Donald J.
The United States of America as represented by the Secretary of
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