Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1988-01-19
1989-03-07
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
318116, 331116R, H01L 4108
Patent
active
048109223
ABSTRACT:
A crystal controlled oscillator in which changes in damping are compensated and a method for decoupling the output signal of such an oscillator from damping changes. The damping decoupled oscillator includes a quartz crystal (10), which produces a periodic signal, connected in series with a variable gain amplifier (18) and a variable phase shift circuit (22). Feedback from the output of the variable phase shift circuit is provided to sustain oscillation of the crystal. Unity gain in the loop is maintained by adjusting the gain of the variable gain amplifier in accordance with the DC value of the output signal, provided by a precision rectifier (34). As the DC value of the output signal changes due to changes in damping or energy loss of the crystal, an absolute value circuit (38) responds by providing a phase control signal for adjusting the phase of the periodic signal to compensate for changes in damping. The output signal of the oscillator is thus controlled at a constant amplitude, with substantially reduced frequency shift.
REFERENCES:
patent: 3967143 (1976-06-01), Watanabe et al.
patent: 4197478 (1980-04-01), Silvus
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4587958 (1986-05-01), Noguchi et al.
patent: 4687962 (1987-08-01), Elbert
Budd Mark O.
Sundstrand Data Control Inc.
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