Saw device and method of manufacture
AssigneeRaytheon Company
InventorsThomas E. Parker, James A. Greer
Life of this patent
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Abstract
A SAW oscillator package having low vibration sensitivity includes a stiffener layer disposed between a mounting surface for the oscillator and the oscillator circuit package. Preferably, the stiffening layer comprises a slab of a highly stiff material such as a ceramic and, in particular, aluminum oxide, as well as other material which preferably have suitable thermal expansion coefficients matched between the material of the package and the mounting surface. Moreover, the rigidly of the SAW device itself is also increased by either reducing the lateral dimensions of the SAW device or increasing the thickness of the SAW substrate and/or cover.
Claims13
A SAW oscillator comprising:
- means for providing a closed loop having an integral multiple of 2.pi. radians phase shift and excess small signal gain at a frequency said means including a surface acoustic wave device disposed to stabilize the frequency and phase characteristics of said means;
- a package comprising a base having a first stiffness characteristic supporting said providing means, and
- means disposed on said base for increasing the stiffness characteristic of said base.
A SAW oscillator comprising:
- A SAW device comprising:
- a substrate having a surface which supports surface wave propagation and having coupled to said surface wave propagation a pair of transducers;
- a cover disposed to enclose said surface wave propagation surface of said SAW device;
- and
- a glass frit seal disposed between said cover and said substrate;
- means for providing a closed loop having an integral number of 2.pi. radians of phase shift and a excess small signal gain at a frequency with said closed loop providing means including said SAW device;
- an oscillator package comprising:
- a base supporting said SAW device, said base having a first stiffness characteristic;
- a cover disposed to enclose said base portion of the oscillator package, said cover having a second stiffness characteristic;
- means, disposed on said base portion of the oscillator package for increasing the stiffness characteristic of said base;
- and
- means, disposed on said cover portion of the oscillator package for increasing the stiffness characteristic of said cover.
Dependencies are inferred from the claim text.