California Institute of Technology

The United States of America As Represented by the Administrator of the

I.e.p.c. Corp.

Resonate Industries, Inc.

Vatche Vorperian

Roman Gutierrez

Tony Kai Tang

Christopher Bryan Stell

William J Kaiser

Ronald Flores

Jaroslava Wilcox

Leon Alkalai

Igor Pogodayev

Kirill Shcheglov

Du Li

Donald Hunter

Noam Lotan

An electronics enclosure has a mains input and a lamp output. A power factor correction circuit is installed in the enclosure, to provide a DC output voltage. An inverter is also installed in the enclosure. Control electronics is also installed in the enclosure to control the inverter, and to receive a selection of lamp load type made manually by a user via a user interface on an outside face of the enclosure. The same lamp output can thus alternatively drive, for example, a high pressure sodium lamp and a metal halide lamp, as indicated by the selection. Other embodiments are also described and claimed.

Electronic lighting ballast

A pressure sensor has a high degree of accuracy over a wide range of pressures. Using a pressure sensor relying upon resonant oscillations to determine pressure, a driving circuit drives such a pressure sensor at resonance and tracks resonant frequency and amplitude shifts with changes in pressure. Pressure changes affect the Q-factor of the resonating portion of the pressure sensor. Such Q-factor changes are detected by the driving/sensing circuit which in turn tracks the changes in resonant frequency to maintain the pressure sensor at resonance. Changes in the Q-factor are reflected in changes of amplitude of the resonating pressure sensor. In response, upon sensing the changes in the amplitude, the driving circuit changes the force or strength of the electrostatic driving signal to maintain the resonator at constant amplitude. The amplitude of the driving signals become a direct measure of the changes in pressure as the operating characteristics of the resonator give rise to a linear response curve for the amplitude of the driving signal. Pressure change resolution is on the order of 10.sup.-6 torr over a range spanning from 7,600 torr to 10.sup.-6 torr. No temperature compensation for the pressure sensor of the present invention is foreseen. Power requirements for the pressure sensor are generally minimal due to the low-loss mechanical design of the resonating pressure sensor and the simple control electronics.

High resolution and large dynamic range resonant pressure sensor based

A gyroscope system can detect the amount of movement of the system. The gyroscope system includes a circuit that has a number of different features and detects movement independent of any circuit parameters. The first feature uses a feedback loop to compensate for difference in Q factors between the circuits. Another feature regulates the amplitude of the resonator. Yet another feature extracts the rotation rate signals from the gyroscope in a new way.

Gyroscopes and compensation

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Irvine, CA, United States of America

Vatche Vorperian