Oscillators – Electromechanical resonator – Crystal
Patent
1989-03-09
1990-01-02
Grimm, Siegfried H.
Oscillators
Electromechanical resonator
Crystal
331 10, 331175, H03B 504, H03B 532
Patent
active
048916110
ABSTRACT:
In order to compensate for mechanical vibration that corrupts the RF output spectrum of a crystal oscillator, three accelerometers are mounted with the oscillator and aligned on mutually perpendicular axes. The outputs of the accelerometers are digitized and applied to adaptive transversal filters comprising a digital signal processor. The crystal oscillator is placed on a vibration table and its output is compared with an external frequency reference. The tap weights of the filters are then optimized so that the vibration components of the output spectrum of the oscillator are minimized. After the tap weights of the filters are determined and fixed, the filters provide vibration compensation for the oscillator. During operation of the crystal oscillator, the outputs of the filters are summed and applied to a varactor in the oscillator to compensate the output for the effects of mechanical vibration.
REFERENCES:
patent: 4096445 (1978-06-01), Hopwood et al.
patent: 4100512 (1978-07-01), Valdois et al.
patent: 4277758 (1981-07-01), Mishiro
patent: 4318063 (1982-03-01), Przyjemski
patent: 4453141 (1984-06-01), Rosati
patent: 4458536 (1984-07-01), Ahn et al.
patent: 4575690 (1986-03-01), Walls et al.
patent: 4609885 (1986-09-01), Renoult
Grimm Siegfried H.
Hamann H. Fredrick
McFarren John C.
Murrah M. Lee
Rockwell International Corporation
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