Temperature stable surface acoustic wave device
First Claim
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1. A temperature stable SAW device comprising:
- a substrate having a known power flow angle variation as a function of temperature;
first means for generating surface acoustic waves on a surface of said substrate in response to a first electrical signal; and
second means for generating at least one responsive electrical signal in response to said surface acoustic waves, said second means having a geometry such that said power flow angle variation provides compensation for temperature dependent changes in said substrate.
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Abstract
A temperature stable surface acoustic wave device utilizes a known variation in the power flow angle characteristic of the substrate over a temperature range to vary the response of the device at one or more output transducers in a way which compensates for temperature dependent phase shifts common to prior art devices.
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Citations
9 Claims
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1. A temperature stable SAW device comprising:
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a substrate having a known power flow angle variation as a function of temperature; first means for generating surface acoustic waves on a surface of said substrate in response to a first electrical signal; and second means for generating at least one responsive electrical signal in response to said surface acoustic waves, said second means having a geometry such that said power flow angle variation provides compensation for temperature dependent changes in said substrate. - View Dependent Claims (2, 3, 4)
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5. A temperature stable SAW device comprising:
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a substrate having a known power flow angle variation as a function of temperature; first means for generating surface acoustic waves on a surface of said substrate in response to a first electrical signal; and second means for generating a temperature compensated output signal, said output signal being responsive to said power flow angle variation. - View Dependent Claims (6, 7, 8)
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9. In a SAW device having a substrate which has a known power flow angle variation as a function of temperature and input means on the substrate for generating surface acoustic waves, a method of producing a temperature compensated output signal comprising the steps of:
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generating surface acoustic waves by use of said input means; and receiving said surface acoustic waves and generating an output signal by use of output means which have a geometry such that said power flow angle variation produces a phase shift of said output signal approximately equal and opposite to a phase shift produced by a temperature change.
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Specification