Microphone Sensitivity Adjustment via Segmented Contact Areas
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Solution Overview
Problem
MEMS microphones face sensitivity fluctuations due to manufacturing variations, leading to high tolerance ranges that are undesirable in demanding applications, and existing solutions for adjusting sensitivity require additional contact areas, which are not feasible in miniaturized devices without increasing the footprint.
Innovation Solution
The integration of an OTP component is achieved by splitting existing contact areas into smaller ones, allowing for additional programming contacts without enlarging the device's footprint, using a grid layout where smaller contact areas short-circuit to form a single soldering location, enabling programming without altering the device's size or design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an OTP component is integrated into the microphone to enable sensitivity adjustment, then sensitivity tolerance can be reduced, but the device area increases due to additional contact areas
Solution Approach 1:
One of the conventional contact areas is segmented into two smaller contact areas, allowing the OTP component to be driven without increasing the overall device footprint. The segmentation enables additional functionality while maintaining the original device dimensions.
Solution Approach 2:
The contact areas are designed to serve multiple functions: they provide both the necessary connections for the microphone's normal operation and the additional connections required for driving the OTP component. This multi-functionality eliminates the need for separate dedicated contacts for OTP operation.
2Adaptability or versatility
If additional contact areas are added for OTP component operation, then sensitivity adjustment becomes possible, but the footprint enlargement complicates soldering grid design
Solution Approach 1:
The segmentation of an existing contact area into two smaller areas provides the additional connections needed for OTP operation while maintaining compatibility with the existing soldering grid layout, avoiding the need to redesign the entire footprint.
Solution Approach 2:
The functionality for driving the OTP component is merged with the existing contact area structure. The smaller contact areas are integrated into the original contact area footprint, combining multiple functions within the same spatial envelope.
3Area of stationary object
If circuitry measures are used to multiple utilize existing contact areas, then device area can be maintained, but design requirements for ASIC become stringent and may deteriorate microphone properties
Solution Approach 1:
Rather than requiring complex ASIC circuitry to multiplex existing contacts, the patent uses simple physical segmentation of contact areas. This approach achieves multi-functionality through geometric division rather than complex electronic control, reducing ASIC design requirements.
Solution Approach 2:
The patent replaces the need for complex electronic multiplexing control with a simple mechanical/geometric solution - dividing contact areas into smaller segments. This substitution of control mechanism simplifies the overall system design.
Data Source
AI summary
In order to adjust an electric device, it is proposed to integrate a programmable memory unit into the device and to address said programmable memory unit without enlarging the footprint, via contact areas that are obtained by dividing previous contact areas. In this case, an adjustment value in particular for compensating for a fault tolerance is fed into the memory unit, an operating parameter being readjusted with the aid of said adjustment value. In each case two divided contact areas are short-circuited via a common soldering location during the mounting of the device.