MEMS Sensor High Voltage Switching via CMOS Intermediary
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Solution Overview
Problem
Current MEMS sensor technologies face challenges in effectively switching high voltage signals due to the limitations of low-nm CMOS technology, which affects sensor sensitivity and power consumption, particularly when using smaller transistors that cannot handle the desired voltage magnitudes.
Innovation Solution
The implementation of MEMS switching technology, including specific MEMS switches designed to handle high voltage signals, such as DC and AC biases, and drive signals, which are beyond the capabilities of underlying CMOS circuitry, allowing for efficient operation of MEMS sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If low-nm CMOS technology is used to implement sensor circuitry, then device complexity and manufacturing cost are reduced, but the ability to effectively switch high voltage signals deteriorates
Solution Approach 1:
The patent introduces a MEMS switch as an intermediary component between the low-nm CMOS circuitry and the high voltage MEMS sensor elements. The MEMS switch is capable of handling high voltages (e.g., ±20V or higher) that cannot be directly switched by the CMOS transistors, while being controlled by low-voltage CMOS control signals. This intermediary structure allows the system to benefit from low-nm CMOS integration while maintaining the ability to effectively switch high voltage signals required for efficient MEMS operation.
2Volume of moving object
If smaller transistors are used in low-nm CMOS technology, then device size and cost are reduced, but the voltage handling capability deteriorates
Solution Approach 1:
The patent segments the voltage switching function into two parts: low-voltage control signals are handled by the small low-nm CMOS transistors, while high-voltage switching is delegated to the MEMS switch. This segmentation allows the use of smaller, more integrated CMOS transistors for control functions while the specialized MEMS switch handles the high voltage tasks that require larger, more robust switching elements.
Solution Approach 2:
The MEMS switch acts as an intermediary that bridges the gap between the low-voltage CMOS control signals and the high-voltage MEMS sensor elements. The MEMS switch can be actuated by low-voltage CMOS signals while simultaneously handling high-voltage signal paths, effectively decoupling the voltage handling requirements from the transistor size constraints of the CMOS circuitry.
3Adaptability or versatility
If high voltage signals are switched using CMOS technology, then integration is improved, but signal switching effectiveness deteriorates
Solution Approach 1:
The patent employs a MEMS switch as an intermediary component that enables effective high voltage signal switching while maintaining integration with CMOS circuitry. The MEMS switch is controlled by CMOS-generated control signals and switches high voltage signals to and from the MEMS sensor elements, achieving both integration and switching effectiveness.
Solution Approach 2:
The patent replaces the electrical field-based switching mechanism of CMOS transistors with a mechanical switching mechanism in the MEMS switch. The MEMS switch uses mechanical contact between movable and fixed electrodes to switch high voltage signals, providing low on-resistance and high voltage handling capability that cannot be achieved with electrical field effects alone in scaled CMOS technology.
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 approach enables MEMS sensors to maintain performance without increasing cost by using low-nm CMOS technology, ensuring effective switching of high voltage signals, thereby improving sensitivity and reducing power consumption and noise.
Implementation Method 1
The switch may, for example, comprise a MEMS switch lever, a contact, and an actuator electrode. The lever may be actuated by an electrostatic force
Data Source
AI summary
A system and/or method for utilizing microelectromechanical systems (MEMS) switching technology to operate MEMS sensors. As a non-limiting example, a MEMS switch may be utilized to control DC and/or AC bias applied to MEMS sensor structures. Also for example, one or more MEMS switches may be utilized to provide drive signals to MEMS sensors (e.g., to provide a drive signal to a MEMS gyroscope).