Active Inductor Driver Circuitry for Tunable Piezoelectric Transducers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing piezoelectric transducer systems rely on transformers for signal amplification, which are bulky, costly, and limited in effective range, and are susceptible to interference from other transducers.
Innovation Solution
Implementing active inductor circuitry, comprising gyrator circuitry and capacitance, to adjust frequency characteristics of the output signal, eliminating the need for transformers and allowing for on-chip integration and dynamic tuning of operational frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer is used to increase the driving voltage amplitude, then the signal to noise ratio and effective range are improved, but the physical size, weight, and cost of the system increase
Solution Approach 1:
The patent replaces the mechanical transformer system with an active inductor circuit implemented using electronic components (operational amplifiers, transistors, capacitors, and inductors). This electronic substitution eliminates the need for a physical transformer, thereby reducing weight while maintaining the voltage amplification function through active circuitry that can provide the necessary driving voltage to the piezoelectric transducer
Solution Approach 2:
The patent changes the operating parameters of the piezoelectric transducer by using an active inductor circuit that can dynamically adjust the resonant frequency and impedance matching. This allows the system to operate at optimized frequencies for maximum signal output without requiring a transformer, thus improving signal to noise ratio while avoiding the weight penalty of transformer hardware
2Reliability
If a transformer is used to increase the driving voltage amplitude, then the effective range is improved, but the device complexity and cost increase
Solution Approach 1:
The patent substitutes the transformer-based voltage amplification system with an active inductor circuit implemented using standard electronic components. This replacement simplifies the overall device architecture by eliminating the need for magnetic coupling, shielding, and precise transformer winding ratios, while achieving the same effective range through electronic voltage amplification and impedance matching
Solution Approach 2:
The active inductor circuit serves multiple functions simultaneously: it provides voltage amplification, impedance matching, and resonant frequency tuning. This multi-functionality consolidates what would otherwise require separate transformer and tuning circuit components, thereby reducing device complexity and cost while maintaining effective range
3Productivity
If multiple piezoelectric transducers are co-located in a system, then the system functionality is improved, but interference between transducers increases
Solution Approach 1:
The patent applies local quality by enabling each piezoelectric transducer to be independently tuned to its own resonant frequency through individual active inductor circuits. This allows co-located transducers to operate at different frequencies, creating localized frequency domains for each transducer and eliminating mutual interference while maintaining full system functionality
Solution Approach 2:
The patent implements dynamic frequency tuning capability through the active inductor circuit, which can adjust its resonant frequency in response to control signals. This dynamic adjustment allows the system to allocate different operating frequencies to different transducers on demand, preventing interference while preserving the ability of all transducers to function simultaneously
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
Enhances system range and reduces interference by optimizing frequency response and bandwidth without the need for off-chip inductors, enabling dynamic adjustment to suit specific applications and compensate for component variations.
Implementation Method 1
Piezoelectric transducers are used in a variety of applications. For example, parking sensor systems for cars and other vehicles typically employ a plurality of piezoelectric transducers for transmitting and detecting ultrasonic signals.
Implementation Method 2
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.
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 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.