Parallel MEMS Transducer Testing via Bias Voltage Modulation
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Solution Overview
Problem
Current testing methods for ultrasound MEMS transducer arrays are complex, time-consuming, and costly due to the need for mechanical stimulation, making it challenging to identify faults such as broken membranes or short circuits during manufacturing.
Innovation Solution
A method involving modulation of a bias voltage signal to test ultrasound transducer arrays, allowing for simultaneous interrogation of multiple transducers without the need for mechanical input, using a test signal to generate a modulated bias voltage that is analyzed for output signal changes indicative of faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical stimulation is used to test transducers, then testable output can be produced, but testing becomes complicated and time-consuming
Solution Approach 1:
The patent replaces mechanical stimulation with electrical stimulation by applying a test voltage signal to the bias voltage input of the MEMS transducer array. This substitution eliminates the need for complex mechanical test equipment while maintaining the ability to detect faults through output signal analysis.
Solution Approach 2:
The patent introduces a test voltage signal as an intermediary that modulates the bias voltage to generate an AC component. This intermediary signal enables fault detection without requiring direct mechanical interaction with the transducers, simplifying the testing system.
2Reliability
If mechanical stimulation is used to test transducers, then output can be produced, but testing becomes expensive
Solution Approach 1:
By substituting mechanical stimulation with electrical test signals applied to the bias voltage input, the patent eliminates expensive mechanical test equipment while maintaining effective fault detection capability, thereby reducing manufacturing costs.
3Reliability
If each transducer is tested individually, then fault detection accuracy is maintained, but testing time increases
Solution Approach 1:
The patent merges the testing of multiple transducers into a single parallel operation by applying a common test voltage signal to the bias voltage input that simultaneously stimulates all transducers in the array. The controller then analyzes individual output signals to maintain detection accuracy while achieving parallel testing speed.
Solution Approach 2:
The test voltage signal applied to the bias voltage input serves as a universal stimulus that simultaneously tests all transducers in the array, making the testing system multi-functional and enabling parallel evaluation of multiple elements without requiring individual test channels.
4Measurement precision
If specialized equipment is used for testing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces specialized mechanical test equipment with standard electrical signal generation and measurement devices. The test voltage signal source and controller provide sufficient measurement precision without requiring complex mechanical stimulation and detection systems.
Data Source
AI summary
Described herein are methods and systems for testing transducers and associated integrated circuits. In some cases, a method or system described herein can comprise modulating a bias voltage using a test signal in order to produce a modulated bias voltage signal useful in testing a plurality of transducers of a transducer array in parallel.