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US 11,456,700 B1Granted
Specifying SC and IT cut quartz resonators for optimal temperature compensated oscillator performance
AssigneeRockwell Collins, Inc.
InventorJohn Day
Life of this patent
Estimating the term…
Abstract
An oscillator includes dual resonators mounted in a helium filled coldweld holder. One resonator operates at anti-resonance into a load capacitance of about 20 picofarads, and operates on a third overtone frequency under noncontrolled temperature conditions. The other resonator operates on a fundamental mode at anti-resonance in a load capacitance of about 32 picofarads. Resonator crystals in a dual-crystal resonator may include a theta-angle shift to equalize frequency versus temperature curves at temperature extremes.
Claims17
An oscillator comprising:
- a first crystal resonator;
- and
- a second crystal resonator,
- wherein:
- the first crystal resonator is configured to operate as a main oscillator at anti-resonance;
- and
- the second crystal resonator is configured to operate as a temperature sensor at anti-resonance,
- wherein the first crystal resonator's theta-angle is rotated between four and twelve minutes of a degree relative to the nominal angle optimized for an ovenized oscillator.
5 more elements
A computer apparatus comprising:
- an oscillator having a first crystal resonator and a second crystal resonator,
- wherein:
- the first crystal resonator has a theta-angle modification of between an additional four and twelve minutes of a degree;
- the first crystal resonator is configured to operate at anti-resonance;
- and
- the second crystal resonator is configured to operate at anti-resonance.
3 more elements
A radio assembly including and oscillator comprising:
- an oscillator having a first crystal resonator and a second crystal resonator,
- wherein:
- the first crystal resonator is configured to operate at anti-resonance;
- and
- the second crystal resonator is configured to operate at anti-resonance,
- wherein the first crystal resonator's theta-angle is rotated between four and twelve minutes of a degree relative to the nominal angle optimized for an ovenized oscillator.
3 more elements
Dependencies are inferred from the claim text.