High performance inductive sensing all digital phase locked loop

• Main Authors: Gürleyük, Ça{hacek over (g)}ri, Walsh, Paul M, O'Keeffe, Daniel, MacSweeney, Dermot, Makinwa, Kofi, Pimenta, Matheus, Seguine, Dennis R
• Format: Patent
• Language: English
• Published: 10.01.2023
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; BASIC ELECTRONIC CIRCUITRY; DETECTING MASSES OR OBJECTS; ELECTRICITY; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; PULSE TECHNIQUE; TARIFF METERING APPARATUS; TESTING

One inductive sensor is configured to maintain a fixed frequency in a resonant circuit. One apparatus includes an inductance-to-digital converter (LDC). The LDC includes a digital filter to measure an inductance change of a sensor and convert the inductance change to a digital value. The LDC further includes a digital control loop to maintain a fixed frequency in the sensor. The sensor forms an oscillator in the digital control loop. An output of the digital control loop is representative of the inductance change of the sensor.