Resonator-based sensor and sensing method thereof
AssigneeElectronics and Telecommunications Research Institute
InventorsHyunjoong Lee, Yi-Gyeong Kim, Yil Suk Yang, Woo Seok Yang, Chang Han Je
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Abstract
A resonator-based sensor and a sensing method thereof for sensing a change in a material that is subject to be sensed which include: generating an oscillation voltage signal by amplifying a current signal output from a resonator in accordance with a physical-chemical change of the material; and generating a gain control signal corresponding to a motional resistance and a clock signal corresponding to a resonant frequency of the resonator are provided.
Claims19
A resonator-based sensor for sensing a change in a material, comprising:
- a resonator configured to output a current signal according to a physical-chemical change of the material;
- an amplifier configured to amplify the current signal to generate an oscillation voltage signal;
- and
- a digital automatic gain controller (AGC) configured to generate a clock signal corresponding to a resonance frequency of the resonator and a gain control signal corresponding to a motional resistance of the resonator based on the oscillation voltage signal,
- wherein the amplifier is controlled by the gain control signal.
A method for sensing a change in a material, comprising:
- generating an oscillation voltage signal by amplifying a current signal output from a resonator according to a physical-chemical change of the material;
- and
- generating a clock signal corresponding to a resonance frequency of the resonator and a gain control signal corresponding to a motional resistance of the resonator based on the oscillation voltage signal,
- wherein an amplifier generating the oscillation voltage signal is controlled by the gain control signal.
A digital automatic gain controller (AGC) for controlling an oscillation circuit of a resonator-based sensor which senses a change in a material, comprising:
- a down-mixing envelope tracker configured to generate an m-bit digital signal according to a magnitude of an envelope of an oscillation voltage signal;
- and
- a delta-sigma modulator configured to modulate a remaining (m−n)-bit signal generated by subtracting an n-bit coarse signal from the m-bit digital signal in a delta-sigma modulation scheme to generate a 1-bit fine signal,
- wherein the m-bit digital signal corresponds to a magnitude of a motional resistance of a resonator included in the oscillation circuit, and a gain control signal for controlling the oscillation circuit is a sum of the coarse signal and the fine signal.
Dependencies are inferred from the claim text.