Multi-Chamber Transducer Module with Shared ASIC
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Solution Overview
Problem
Existing MEMS transducer modules, such as microphones, require multiple dedicated integrated circuit boards and packages, leading to increased space occupation and costs, with complex and expensive fabrication processes that are prone to errors.
Innovation Solution
A transducer module with multiple chambers is designed, where a single substrate houses both MEMS transducers and a shared ASIC, with separate sound ports for each transducer, allowing for efficient signal processing and reduced component duplication, using a cap and substrate configuration that simplifies fabrication and reduces space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated integrated circuit boards and packages are used for each MEMS transducer, then each transducer can operate independently with dedicated signal processing, but the space occupation and device complexity increase significantly
Solution Approach 1:
The patent combines multiple MEMS transducers and a shared ASIC onto a single integrated circuit board. The substrate integrates multiple transducer elements (e.g., microphones, noise erasers) with a common signal processing unit, eliminating the need for separate dedicated boards for each transducer while maintaining functional independence through the shared ASIC's ability to process multiple channels simultaneously.
Solution Approach 2:
The shared ASIC serves multiple functions by processing signals from different transducer types (microphones, noise erasers) through a universal signal processing architecture. The single integrated circuit board provides a multi-functional platform that handles various acoustic functions without requiring dedicated specialized hardware for each function.
2Reliability
If multiple dedicated packages are used for each MEMS transducer, then each transducer has its own housing and electronics, but the overall space occupation increases considerably
Solution Approach 1:
The patent merges multiple transducer packages into a single integrated housing. Instead of separate packages for each microphone or noise eraser, the design consolidates them into one package mounted on a single substrate, significantly reducing the total area occupied while maintaining the protective housing function for all transducers.
Solution Approach 2:
The patent implements a nested structure where multiple transducer elements are housed within a single package. The substrate integrates multiple transducer components in a compact arrangement, with the shared ASIC nested on the same substrate, creating a space-efficient nested configuration that reduces overall device footprint.
3Ease of manufacture
If complex fabrication processes with multiple substrates and coupling techniques are used, then multi-chamber transducer modules can be manufactured, but the fabrication complexity and error susceptibility increase
Solution Approach 1:
The patent simplifies fabrication by merging multiple fabrication steps into a single substrate integration process. Instead of separately fabricating multiple substrates and coupling them through complex techniques like flip-chip, the design uses a single substrate to mount all transducers and the shared ASIC, reducing the number of fabrication steps and coupling operations required.
Solution Approach 2:
The patent segments the transducer functions (microphones, noise erasers) into separate modular elements that can be independently fabricated and then mounted on a common substrate. This segmentation allows for simplified individual fabrication processes while maintaining the ability to create multi-chamber configurations through straightforward assembly on the unified substrate.
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 configuration enables cost-effective and space-efficient integration of multiple transducers with independent operation, reducing fabrication complexity and errors, while sharing signal processing components, thus enhancing the detection of sound signals and noise reduction.
Implementation Method 1
the MEMS sensitive structure in general comprises a mobile electrode, provided as diaphragm or membrane, arranged facing a fixed electrode, to provide the plates of a sensing capacitor with variable capacitance. bending of the membrane that constitutes the mobile electrode causes a variation of capacitance as a function of the acoustic signal to be detected
Data Source
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AI summary
A transducer module (10), comprising: a supporting substrate (23), having a first side (23a) and a second side (23b); a cap (27), which extends over the first side of the supporting substrate and defines therewith a first chamber (108) and a second chamber (109) internally isolated from one another; a first transducer (1) in the first chamber (8); a second transducer (42) in the second chamber (18); and a control chip (22), which extends at least partially in the first chamber and/or in the second chamber and is functionally coupled to the first and second transducers for receiving, in use, the signals transduced by the first and second transducers.