Shunt Capacitance Cancelling Oscillator for Resonator Tracking
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Solution Overview
Problem
Resonator-based systems face challenges in accurately tracking mechanical and electrical changes due to non-zero electrical contributions from shunt capacitance, requiring advanced methods to avoid complex signal deconvolution and impedance distortion.
Innovation Solution
An active shunt capacitance cancelling oscillator circuit is employed, using an inactive resonator with similar electrical properties to cancel out shunt capacitance, allowing for precise tracking of resonator parameters like resonant frequency and monitoring only acoustic contributions, with improved circuit designs for limiting amplifiers to operate at higher frequencies and lower loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resonator-based systems are used to detect mechanical and electrical changes, then detection capability is provided, but impedance distortion and phase shift anomalies occur due to non-zero shunt capacitance
Solution Approach 1:
The patent extracts and removes the harmful shunt capacitance effect from the measurement system by using a dummy resonator that replicates only the electrical properties (capacitance) without the mechanical resonance, allowing the harmful electrical contribution to be separated and cancelled out
Solution Approach 2:
The dummy resonator serves as an intermediary element that mediates between the active resonator and the measurement system, providing a reference for the shunt capacitance that can be used to compensate and eliminate its harmful effects on impedance and phase measurements
2Measurement precision
If complex signal deconvolution schemes are used to extract resonator parameters, then parameter extraction capability is improved, but system complexity increases
Solution Approach 1:
The patent extracts the shunt capacitance effect into a separate dummy resonator component, allowing the measurement system to directly read resonator parameters without needing complex deconvolution algorithms to separate the capacitance contribution from the mechanical response
Solution Approach 2:
The dummy resonator creates an electrical copy of the active resonator's shunt capacitance characteristics, providing a reference signal that simplifies parameter extraction by eliminating the need for mathematical deconvolution of the capacitance contribution
3Measurement precision
If active resonator is used for detection, then sensing capability is provided, but shunt capacitance contributions distort the measurement
Solution Approach 1:
The patent segments the resonator system into two distinct components: an active resonator that provides the sensing function and a dummy resonator that provides only the electrical reference, allowing the acoustic and electrical contributions to be independently characterized and measured
Solution Approach 2:
The dummy resonator acts as an intermediary that isolates and provides the shunt capacitance reference, enabling the active resonator's acoustic contributions to be measured independently without contamination from electrical effects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate and simplified tracking of resonator parameters, avoiding impedance distortion and phase shift anomalies, and allows for the detection of nanoscale changes in bacterial properties during antibiotic exposure, facilitating rapid antimicrobial susceptibility determination.
Implementation Method 1
the first piezoelectric substrate is configured to propagate the shear horizontal surface acoustic wave
Implementation Method 2
the acoustic cavity is configured to store mechanical energy from the acoustic wave
Data Source
AI summary
The present invention relates to an active shunt capacitance cancelling oscillator circuit. Such systems can be used in resonator-based methods, while avoiding impedance distortion and phase shift anomalies.