MEMS Switch Distributed Hinge for Actuation Voltage Headroom
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Solution Overview
Problem
Conventional MEMS switches often have limited actuation headroom, where the actuation voltage is close to the signal voltage, leading to potential inadvertent actuation by the signal being passed.
Innovation Solution
The MEMS switches are designed with a large actuation headroom by using a distributed hinge structure and radial contact pads, requiring an actuation voltage significantly greater than the expected signal voltage to avoid inadvertent actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuation voltage is reduced to be close to the signal voltage, then the ease of operation is improved, but the reliability deteriorates due to potential inadvertent actuation
Solution Approach 1:
The hinge structure is divided into multiple segments (first hinge, second hinge, third hinge) distributed along the beam. This segmentation allows the beam to achieve the necessary deflection for switch actuation through cumulative angular displacement of individual hinge segments, enabling lower actuation voltages while maintaining reliable operation above signal voltage levels.
Solution Approach 2:
The patent changes the mechanical parameters of the beam-hinge system to reduce the actuation voltage requirement. By optimizing the hinge configuration and beam properties, the system achieves actuation at voltages significantly lower than conventional designs, creating sufficient headroom between actuation voltage and signal voltage to prevent inadvertent actuation.
2Reliability
If a distributed hinge structure is used, then the actuation headroom is improved, but the device complexity increases
Solution Approach 1:
Multiple hinge functions are merged into a distributed hinge structure where the first, second, and third hinges work together as an integrated system. This merging approach achieves the desired actuation headroom through coordinated angular displacement while using standard fabrication processes, balancing improved reliability with manageable device complexity.
3Reliability
If the beam is made stiffer to resist signal voltage, then the reliability is improved, but the actuation voltage requirement increases
Solution Approach 1:
The hinge structure provides dynamic flexibility allowing the beam to achieve the necessary deflection for switch actuation through cumulative angular displacement of individual hinge segments. This dynamic mechanism enables the beam to be stiff enough to resist signal voltage while remaining compliant enough to actuate at lower voltages, resolving the contradiction between reliability and ease of operation.
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 design effectively prevents inadvertent actuation of the MEMS switches by ensuring the actuation voltage is substantially higher than the signal voltage, enhancing the reliability and stability of the switches.
Implementation Method 1
application of an electric field generated by applying a voltage to an electrode on the substrate
Implementation Method 2
The switch is closed when the free end of the beam is pulled into contact with an underlying substrate by application of an electric field generated by applying a voltage to an electrode
Implementation Method 3
the spring restoring force of the beam causes the free end of the beam to not contact the substrate
Data Source
AI summary
Microelectromechanical systems (MEMS) switches are disclosed. The MEMS switch may have an actuation voltage greater than the expected voltage of a signal being passed by the MEMS switch in normal operation. The MEMS switches may include a distributed hinge structure in some embodiments. Radial contact pads are included in some embodiments, with or separate from the distributed hinge.