Floating Bridge Nano Relay for Low Voltage Switching
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Solution Overview
Problem
Conventional nano-electro-mechanical relays face challenges in scaling to smaller dimensions due to increased stiffness of cantilever beams, requiring higher voltages that are not compatible with low-voltage integrated circuits, and struggle with reliable switching and resistance characteristics in configuration memory applications.
Innovation Solution
The development of a nano-electric switch with a floating conductive bridge that moves within a cavity defined by a cavity base and confinement walls, utilizing electrostatic or electromagnetic actuators to complete or break electrical circuits, allowing for lower switching voltages and improved scalability, and incorporating features like oxide-nitride-oxide structures and magnetic materials for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional cantilevered beam NEM relays are used, then switching function is achieved, but higher voltages are needed as dimensions are reduced due to increased beam stiffness
Solution Approach 1:
The relay structure is segmented into a fixed electrode, a movable bridge element, and a gate electrode. The bridge element is supported by flexible beams that are segmented into multiple sections, allowing differential movement. This segmentation enables the bridge to deflect toward the gate electrode without requiring the entire structure to be oversized, thus maintaining low operating voltage while scaling to smaller dimensions.
Solution Approach 2:
The relay employs dynamic operation where the bridge element transitions between static states (rest position and actuated position). The flexible beams provide dynamic flexibility, allowing the bridge to move freely in response to electrostatic forces from the gate electrode. This dynamic behavior enables reliable switching at low voltages despite reduced dimensions.
2Length of moving object
If conventional cantilevered beam NEM relays are used, then switching function is achieved, but reliability of switching operation deteriorates with scaling
Solution Approach 1:
The bridge element is segmented from the supporting beams, allowing independent optimization. The beams provide mechanical support and flexibility, while the bridge element provides reliable electrical contact. This segmentation ensures that the switching action is isolated to the bridge element, improving reliability as dimensions are reduced.
Solution Approach 2:
The flexible beams act as intermediaries between the fixed substrate and the movable bridge element. They transmit mechanical stress and provide the necessary compliance for reliable switching operation. This intermediary structure protects the bridge element from substrate constraints, maintaining switching reliability at scaled dimensions.
3Reliability
If conventional NEM relays are used, then configuration memory function is achieved, but ON resistance and leakage current characteristics are insufficient
Solution Approach 1:
The bridge element is provided with a conductive coating specifically at the contact regions where electrical connection is needed. This localized conductive layer provides low ON resistance at the switching contacts without requiring the entire bridge structure to be highly conductive, thus achieving good memory characteristics with simpler overall structure.
Solution Approach 2:
The relay structure uses composite materials: the bridge element combines a mechanical support structure (e.g., silicon nitride) with a conductive coating layer (e.g., metal). This composite approach provides both the mechanical flexibility needed for reliable switching and the electrical conductivity needed for low ON resistance and low leakage current, meeting configuration memory requirements without excessive complexity.
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
The floating bridge relay achieves reliable switching with lower power consumption and scalability to smaller geometries, providing low ON resistance, high OFF resistance, and resistance to single-event upsets, making it suitable for configuration memory in integrated circuits.
Implementation Method 1
An electrical signal applied to the gate electrode attracts a cantilevered beam (e.g., by electrostatic attraction), which pulls a contact toward the drain electrode, closing an electrical circuit
Implementation Method 2
the floating conductive bridge includes a magnetic material
Data Source
AI summary
A nano-electric switch includes a cavity base, a confinement wall, and a cavity top defining a cavity. A floating conductive bridge movable within the cavity completes an electrical circuit between a first electrical contact and a second electrical contact in a first selectable position, and breaks the electrical circuit in a second selectable position.