Semiconductor Capacitive Isolation Layout for High-Voltage Galvanic Isolation
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Solution Overview
Problem
The semiconductor industry faces challenges in providing sufficient galvanic isolation for high voltage applications in integrated circuit chips with smaller dimensions and increased density, as conventional capacitive isolation methods require excessive vertical stack height of dielectric material layers for effective isolation.
Innovation Solution
The semiconductor structure incorporates a substrate with a first and second electrode, isolated by a dielectric isolation layer positioned laterally between them, allowing for capacitive coupling while maintaining electrical isolation without the need for multiple vertically stacked dielectric layers, thereby reducing device footprint and dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capacitive isolation uses multiple vertically stacked dielectric material layers, then effective galvanic isolation is achieved, but device footprint and vertical dimensions increase excessively
Solution Approach 1:
The patent transitions from vertical stacking of multiple dielectric layers to a lateral configuration where a single dielectric isolation layer is positioned horizontally between first and second isolation structures. This dimensional change from vertical (z-axis) to lateral (x-y plane) arrangement achieves the same galvanic isolation effect while dramatically reducing the vertical stack height and device footprint.
Solution Approach 2:
The isolation system is segmented into distinct first and second isolation structures with a dielectric isolation layer positioned between them. Each isolation structure contains an electrode, and the dielectric layer is laterally disposed between these structures, creating a modular configuration that achieves isolation without requiring multiple stacked layers.
2Temperature
If higher operating voltages are required, then capacitive isolation becomes necessary, but space constraints on the IC chip increase
Solution Approach 1:
By reorienting the isolation layer from vertical stacking to lateral positioning between isolation structures, the patent reduces the area required on the chip plane. The lateral configuration allows the isolation functionality to be achieved within a smaller footprint while maintaining the capability to handle higher operating voltages through capacitive coupling.
Solution Approach 2:
The patent changes the geometric parameters of the isolation structure from vertical stacking height to lateral separation distance. This parameter change allows the same isolation effectiveness to be achieved with reduced chip area by utilizing lateral spacing rather than vertical thickness to provide the necessary dielectric barrier for high voltage 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 configuration enables effective galvanic isolation between circuits while minimizing the device footprint and component dimensions, facilitating efficient signal transmission through capacitive coupling without direct current flow, thus addressing the space constraints and high voltage requirements.
Implementation Method 1
capacitive isolation structures for high voltage applications
Implementation Method 2
galvanic isolation can provide a way for transmitting a signal from one electrical circuit to another electrical circuit while electrically isolating the two electrical circuits from one another
Data Source
AI summary
The present disclosure generally relates to semiconductor structures for capacitive isolation, and structures incorporating the same. More particularly, the present disclosure relates to capacitive isolation structures for high voltage applications. The present disclosure also relates to methods of forming structures for capacitive isolation and the structures incorporating the same. The disclosed semiconductor structures may enable a smaller device footprint and reduced dimensions of components on an IC chip, whilst ensuring galvanic isolation between circuits.