Wafer-Level Integrated Plasma Power Limiter for Signal Integrity
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Solution Overview
Problem
Existing plasma power limiters are separate, bulky devices that cause significant signal loss and cannot be easily integrated into sensitive electronic circuits due to their design, making them unsuitable for applications where space and signal integrity are critical.
Innovation Solution
A monolithically fabricated wafer-level plasma power limiter is integrated onto the same substrate as other circuits using wafer-level processing, featuring a hermetically sealed cavity with ionizable gas and vertically extended probe tips that act as plasma triggers, allowing for controlled ionization and current sinking without signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separate plasma power limiters are used, then high-power signal protection is achieved, but device size increases and signal loss occurs
Solution Approach 1:
The plasma power limiter is merged with the semiconductor device by integrating the cavity structure directly into the device substrate. The cavity is formed within the semiconductor material itself, eliminating the need for separate external limiter devices while maintaining protection functionality.
Solution Approach 2:
The cavity structure is nested within the semiconductor device substrate, with the cavity containing ionizable gas and being surrounded by conductive layers that are part of the semiconductor device structure. This nested arrangement allows the limiter function to be embedded within the device volume.
2Reliability
If traditional separate plasma power limiters are used, then high-power signal protection is achieved, but signal loss increases
Solution Approach 1:
By merging the plasma power limiter with the semiconductor device, the signal path is shortened and direct coupling is achieved between the device and the protective cavity structure, minimizing signal loss while maintaining protection capability.
3Volume of moving object
If wafer-level integration is used, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The cavity structure, conductive layers, and ionizable gas are prepared and integrated into the semiconductor device during the wafer fabrication process itself, before final device assembly. This preliminary integration simplifies subsequent manufacturing steps despite the added initial complexity.
Solution Approach 2:
Ionizable gas is introduced into the sealed cavity structures during wafer-level processing, utilizing gas handling techniques to fill and seal the cavities in an automated manner, which manages the manufacturing complexity of integrating gas-filled structures.
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 integrated plasma power limiter effectively protects sensitive electronics from high-intensity signals by allowing low-intensity signals to pass through while ionizing and diverting high-intensity signals to ground, minimizing signal loss and enhancing the reliability of high-frequency receivers.
Implementation Method 1
A monolithically fabricated wafer-level plasma power limiter is integrated onto the same substrate as other circuits using wafer-level processing, featuring a hermetically sealed cavity with ionizable gas
Implementation Method 2
when ionized becomes a plasma and allows electrical current to propagate therethrough
Data Source
Figure 1~2
Figure 3~4
AI summary
A plasma power limiter fabricated using wafer-level fabrication techniques with other circuit elements. The plasma limiter includes a signal substrate and a trigger substrate defining a hermetically sealed cavity therebetween in which is encapsulated an ionizable gas. The signal substrate includes a signal line within the cavity and the trigger substrate includes at least one trigger probe extending from the trigger substrate towards the transmission line. If a signal propagating on the transmission line exceeds a power threshold, the gas within the cavity is ionized creating a conduction path between the transmission line and the trigger probe that draws off the high power current.