False triggering prevention in a resonant phase sensing system

US10642435B2 · kind B2 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• Siddharth Maru · Austin, US
• Tejasvi Das · Austin, US
• Luke Lapointe · Austin, US
• Srdjan Marijanovic · Austin, US
• Zhong You · Felton, GB
• Drew Kinney · Austin, US
• Anthony S. Doy · Los Gatos, US
• Eric J. King · Dripping Springs, US

Key dates

• Filing date: Mar 6, 2019
• Grant date: May 5, 2020
• Expiry date: Mar 6, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F3/045
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The system may also include a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.