Patent Number: 6,253,612

Title: Generation of mechanical oscillation applicable to vibratory rate gyroscopes

Abstract: To achieve a drive-axis oscillation with improved frequency and amplitude stability, additional feedback loops are used to adjust force-feedback loop parameters. An amplitude-control loop measures oscillation amplitude, compares this value to the desired level, and adjusts damping of the mechanical sense-element to grow or shrink oscillation amplitude as appropriate. A frequency-tuning loop measures the oscillation frequency, compares this value with a highly stable reference, and adjusts the gain in the force-feedback loop to keep the drive-axis oscillation frequency at the reference value. The combined topology simultaneously controls both amplitude and frequency. Advantages of the combined topology include improved stability, fast oscillation start-up, low power consumption, and excellent shock rejection.

Inventors: Lemkin; Mark A. (Berkeley, CA), Juneau; Thor N. (Berkeley, CA), Clark; William A. (Fremont, CA), Roessig; Allen W. (Albany, CA)

Assignee: Integrated Micro Instruments, Inc.

International Classification: G01C 19/56 (20060101); G01C 019/00 ()

Expiration Date: 07/03/2018