Acoustic wave devices with temperature stabilization
First Claim
1. An acoustic wave device comprising at least two acoustic components each having transducer means for launching and receiving acoustic waves along an acoustic track in a substrate, said acoustic components having their respective transducer means electrically connected to one another in parallel and each having a similar phase slope but different temperature coefficients whereby the resultant overall frequency response of the device is compensated over a useful temperature range.
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Abstract
An acoustic wave device comprises a substrate carrying two or more acoustic components aligned in different directions and electrically connected together in parallel. The phase slope of the acoustic components are similar but their temperature coefficients of delay are different whereby their resultant frequency response is compensated over a useful temperature range. The acoustic components may be delay line employing surface waves or surface skimming bulk waves, or one or two port resonators using surface waves.
88 Citations
15 Claims
- 1. An acoustic wave device comprising at least two acoustic components each having transducer means for launching and receiving acoustic waves along an acoustic track in a substrate, said acoustic components having their respective transducer means electrically connected to one another in parallel and each having a similar phase slope but different temperature coefficients whereby the resultant overall frequency response of the device is compensated over a useful temperature range.
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14. An acoustic wave device comprising a piezo electric substrate having a plurality of zero temperature coefficient crystalline orientations;
- a main acoustic wave delay line comprising an interdigital input transducer and an interdigital output transducer arranged on an acoustic track aligned in a first direction on the substrate;
at least one auxiliary acoustic wave delay line comprising an interdigital input transducer and an interdigital output transducer arranged on an acoustic track aligned in a direction different from the first direction, said auxiliary delay line having a transmission amplitude smaller than that of the main delay line;
means electrically connecting the delay lines in parallel, each delay line being aligned on a different zero temperature crystalline orientation and having a similar phase-slope but different temperature coefficients whereby the overall frequency response of said device is compensated over a useful temperature range. - View Dependent Claims (15)
- a main acoustic wave delay line comprising an interdigital input transducer and an interdigital output transducer arranged on an acoustic track aligned in a first direction on the substrate;
Specification