Patent
Damping decoupled oscillator using a high impedance crystal
TLDR
In this paper, a crystal controlled oscillator with a variable gain amplifier and a variable phase shift circuit is presented, where the output signal of the oscillator is controlled at a constant amplitude with substantially reduced frequency shift.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.read more
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Micromachined rate and acceleration sensor
TL;DR: In this article, a sensor is disclosed for measuring specific force and angular rotation rate of a moving body and is micromachined from a silicon substrate (16), each having a force sensing axis (38) and producing an output signal of the acceleration of the moving body along its sensing axis.
Patent
Triaxial angular rate and acceleration sensor
TL;DR: A triaxial sensor substrate is adapted for use in measuring the acceleration and angular rate of a moving body along three orthogonal axes as discussed by the authors, where each substrate includes three individual sensors that are arranged in the plane of the substrate at an angle of 120 degrees with respect to one another.
Patent
Control apparatus for vibration driven motor
TL;DR: In this article, a unit for attenuating frequency components generated in a sideband of a frequency of an AC voltage applied to an electro-mechanical energy conversion element is presented.
Patent
Counting scale and load cell assembly therefor
TL;DR: In this paper, the authors present a counting scale which implements a load cell assembly for the measurement of weight used in counting calculations, where a controller is included in the assembly to drive these resonators, convert their frequency outputs to digital values, and correct for various environmental effects, to obtain an accurate weight measurement for use in counting scale.
Patent
Electronic force sensing load cell
TL;DR: In this paper, a load cell device is defined as a load-cell structure formed of a suitable metal and including vertically spaced apart, generally parallel horizontal elements (14, 15) integrally formed with longitudinally spaced apart and generally parallel vertical elements (12, 13).
References
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Patent
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