Active Inductor Driver Circuitry for Tunable Piezoelectric Transducers
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Solution Overview
Problem
Existing piezoelectric transducer systems for applications like parking sensors face limitations due to the use of large, heavy, and costly transformers, which also suffer from limited range and susceptibility to interference.
Innovation Solution
The implementation of active inductor circuitry, including gyrator circuitry and adjustable capacitance, integrated into a driver circuit to tune the frequency characteristics of the piezoelectric transducer, eliminating the need for off-chip inductors and transformers, and allowing for dynamic adjustment of operational bandwidth and frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer is used to provide high driving voltage, then the signal to noise ratio is improved, but the device size, weight and cost increase
Solution Approach 1:
The patent replaces the mechanical transformer system with an active inductor circuit implemented using electronic components (transconductors, capacitors, and resistors). This electronic substitution eliminates the need for a physical transformer while achieving the same voltage amplification function through controlled current sources and impedance transformation, thereby reducing weight and size while maintaining signal to noise ratio.
Solution Approach 2:
The patent uses variable transconductance parameters in the active inductor circuit to dynamically adjust the voltage gain and frequency response. By changing the transconductance values of the transconductors, the circuit can provide the required high driving voltage without the fixed weight and size constraints of a traditional transformer, allowing parameter optimization for different operating conditions.
2Length of moving object
If a transformer is used to increase driving voltage, then the effective range is improved, but the device complexity increases
Solution Approach 1:
The active inductor circuit serves multiple functions simultaneously: it provides voltage amplification, frequency tuning, and impedance matching. By integrating these functions into a single electronic circuit block rather than requiring separate transformer and tuning components, the patent reduces overall device complexity while maintaining extended effective range through high driving voltage.
Solution Approach 2:
The replacement of the mechanical transformer with an electronic active inductor circuit simplifies the overall system architecture. The electronic implementation allows for integrated circuit fabrication, reducing the number of discrete components and interconnections required, thereby lowering device complexity while achieving the same range extension through voltage amplification.
3Power
If a transformer is used for voltage amplification, then the transmitted signal energy is improved, but the susceptibility to interference increases
Solution Approach 1:
The patent employs adjustable transconductance parameters and variable capacitance values in the active inductor circuit to dynamically tune the frequency response and bandwidth. This parameter adjustment capability allows the circuit to optimize transmitted signal energy at specific frequencies while filtering out interfering signals, thereby reducing interference susceptibility compared to a fixed-frequency transformer approach.
Solution Approach 2:
The active inductor circuit provides dynamic frequency tuning capability through variable transconductance and capacitance, allowing the system to adapt to different operating conditions and avoid interfering frequencies. This dynamic adjustment enables the circuit to maintain high transmitted signal energy while actively managing interference susceptibility, unlike a static transformer design.
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 enhances the operational range and reduces interference by optimizing the frequency characteristics of the piezoelectric transducers, enabling more efficient and flexible operation without the need for bulky transformers, while allowing for individual tuning of multiple transducers to minimize coexistence issues.
Implementation Method 1
The active inductor circuitry may comprise gyrator circuitry and a capacitance. The gyrator circuitry may comprise first and second transconductors arranged in a back-to-back configuration.
Implementation Method 2
driver circuitry configured to supply a drive signal to the piezoelectric transducer to cause the transducer to generate an output signal
Data Source
AI summary
The present disclosure relates to circuitry for driving a piezoelectric transducer. The circuitry may be implemented as an integrated circuit and comprises driver circuitry configured to supply a drive signal to the piezoelectric transducer to cause the transducer to generate an output signal and active inductor circuitry configured to be coupled with the piezoelectric transducer. The active inductor circuitry may be tuneable to adjust a frequency characteristic of the output signal.