Patent ID: 11162972

Abstract:
A microelectromechanical system (MEMS) sensor includes a substrate having a piezoelectric layer thereon; a MEMS piezoelectric resonator including a reference electrode on a first side of the piezoelectric layer, a first port (port 1) including a capacitor coupling electrode on a side of the piezoelectric layer opposite the first side, and a second port (port 2) for excitation signal coupling including another electrode on the side opposite the first side. The MEMS piezoelectric resonator has a natural resonant frequency. A variable capacitor on the substrate is positioned lateral to the MEMS piezoelectric resonator having a first and a second plate are connected to port 1. An antenna or an oscillator circuit is connected to port 2. Responsive to a physical parameter a capacitance of the variable capacitor changes which changes a frequency of the MEMS piezoelectric resonator relative to the natural resonant frequency to generate a frequency shift.