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Author

Treatch James E

Bio: Treatch James E is an academic researcher from Motorola. The author has contributed to research in topics: Compensation (engineering). The author has an hindex of 1, co-authored 1 publications receiving 18 citations.

Papers
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Patent
21 Nov 1966

18 citations


Cited by
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Patent
09 Feb 1983
TL;DR: In this paper, a piezoelectric composite thin-film resonator has been proposed, which has good temperature stability and resonance response, in a fundamental thickness-extensional vibration mode.
Abstract: A piezoelectric composite thin-film resonator has good temperature stability and resonance response, in a fundamental thickness-extensional vibration mode. Spurious vibrations caused by even-number order harmonic overtones are suppressed. The resonator has a thin film of SiO2 or other materials having a resonant frequency temperature coefficient which is opposite to that of the piezoelectric material. The SiO2 layer is inserted between two thin films of ZnO, CdS, AlN, or other piezoelectric materials. This sandwiched structure is positioned between a pair of electrode films and is supported by an insulative or a semiconductive film which is in turn fixed to a substrate. The thicknesses of the thin films have values such that an overall temperature coefficient of the resonant frequency may be at or near substantially zero. In order to better remove the even-number order harmonics, it is preferable to cover the upper electrode film with a thin film of semiconductor or insulator material.

178 citations

Patent
01 Oct 1971
TL;DR: In this paper, a temperature compensated acoustic surface wave delay line is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness.
Abstract: A temperature compensated acoustic surface wave device, such as a surface wave delay line is provided in which temperature compensation is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness. A double substrate arrangement is also disclosed in which the interdigital electrode structure is deposited upon the surface of a non-piezoelectric layer which in turn is placed upon the surface of a piezoelectric substrate.

43 citations

Patent
18 Jun 1984
TL;DR: In this paper, an actuator for injecting fuel into an automobile at a high speed and a delicate response to external operation is provided by selecting the ratio of the number of the piezoelectric elements having the positive and negative temperature dependencies.
Abstract: A piezoelectric transducer comprising a lamination of piezoelectric elements including one or more elements in which the distortion has a positive temperature dependency and one or more elements in which the distortion has a negative temperature dependency. By selecting the ratio of the number of the piezoelectric elements having the positive and negative temperature dependencies, the temperature dependency of the distortion of a transducer can be eliminated. An actuator for injecting fuel into an automobile at a high speed and delicate response to external operation is provided.

38 citations

Patent
28 Jan 1980
TL;DR: In this paper, a mounting structure for crystal resonators used as frequency standards and transducers which maximizes performance and reduces the sensitivity to environmental errors is presented. But, the mounting structure is not suitable for high-frequency transducers.
Abstract: A mounting structure for crystal resonators used as frequency standards and transducers which maximizes performance and reduces the sensitivity to environmental errors. In one embodiment, force sensitive crystal resonators having inherent unmounted temperature sensitivities are used in conjunction with reactive spring-like mounting arrangements having predetermined temperature stress characteristics such that the thermally induced mechanical stress of the mounting arrangements changes, compensates, and optimizes the overall combined temperature characteristics. In another embodiment crystal resonators are isolated from the external environment so that they are capable of sensing forces while operating in a vacuum or inert atmosphere. Environmental isolation is provided by bellows and/or diaphragm arrangements used alone or in conjunction with air-tight enclosures which enable forces to be applied to stress-sensitive crystals while isolating the crystals from the external force producing environment.

26 citations

Patent
02 Jul 1974
TL;DR: In this article, a surface acoustic wave (SAW) structure is disclosed wherein a SAW device is incorporated as an exterior lamina within a composite laminate in order to temperature stabilize the acoustic device.
Abstract: A surface acoustic wave (SAW) structure is disclosed wherein a SAW device is incorporated as an exterior lamina within a composite laminate in order to temperature stabilize the acoustic device. The composite laminate is synthesized to selectively mismatch the thermal expansion characteristics of the piezoelectric material, which is the body of the acoustic device, along the axis of acoustic propagation and simultaneously approximately match the thermal expansion properties along the orthogonal axis. Compressive force is thereby applied to the acoustic device to keep the substrate length constant and thus provide an approximately zero temperature coefficient over a preferred range of temperatures.

16 citations