Oscillators – With outer casing or housing – With temperature modifier
Patent
1996-08-23
1998-03-17
Mis, David
Oscillators
With outer casing or housing
With temperature modifier
331158, 310315, 310343, H03B 532, H03L 104
Patent
active
057291810
ABSTRACT:
An oven assembly for a crystal resonator and oscillator utilizes a thermally symmetrical design to provide a high thermal gain. The oven assembly includes an encasement that forms a hermetically sealed oven chamber that is substantially cylindrical. Concentric with the oven chamber is an annular oven mass that functions as a heat reservoir for the crystal resonator that is contained within the oven mass. The cylindrical oven chamber and the concentric annular oven mass provide two levels of circular symmetry that help achieve a thermally isotropic oscillator environment. Wide-area uniform heat transfer promotes high thermal gain and minimizes thermal gradients. Another factor is the geometry and circuitry for temperature monitoring. Temperature sensors are equidistantly spaced from each other and are equidistant from the center of the oven chamber. Signals from the various thermistors are averaged to provide a more accurate temperature determination for regulating the heaters.
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Collin James R.
Cutler Leonard S.
Giffard Robin P.
Johnson James L.
Karlquist Richard K.
Hewlett--Packard Company
Mis David
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