Semiconductor Pad Voltage Matching Bulk Bias
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Solution Overview
Problem
Existing semiconductor pad structures face challenges in maintaining the same voltage level as the semiconductor substrate, which is necessary for effective bulk bias application without requiring additional layout changes or plug installations.
Innovation Solution
A semiconductor pad structure is designed with a doped junction area and a metal layer portion that receives an externally applied voltage, transferring it to the substrate, utilizing a polylayer portion electrically connected to the junction area to ensure the substrate receives the same voltage level as the pad, thereby eliminating the need for separate plug installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate plug is formed to apply bulk bias to the semiconductor substrate, then the substrate can receive the required voltage level, but the device complexity and manufacturing process increase
Solution Approach 1:
The patent combines the pad structure with the bulk bias application function by forming a conductive type conversion layer that electrically connects the pad to the semiconductor substrate. This merging eliminates the need for a separate plug structure, as the pad itself now serves dual purposes: signal transmission and bulk bias application. The conductive layer integrates these functions into a unified structure, reducing device complexity while maintaining reliability.
Solution Approach 2:
The pad structure is designed to perform multiple functions simultaneously. The conductive type conversion layer enables the pad to both transmit external signals and apply bulk bias to the substrate. This multi-functionality eliminates the need for dedicated separate structures for each function, thereby reducing overall device complexity while ensuring reliable voltage application to the substrate.
2Reliability
If additional layout changes are made to apply bulk bias, then the substrate voltage can be controlled, but the ease of manufacture decreases
Solution Approach 1:
The patent merges the bulk bias control function into the existing pad layout by forming a conductive type conversion layer within the pad structure. This approach eliminates the need for additional layout changes, as the voltage control is achieved through the integrated conductive layer that connects the pad to the substrate. The manufacturing process remains simple since no separate bias control structures need to be added to the layout.
Solution Approach 2:
The pad structure serves itself by applying bulk bias through the conductive type conversion layer without requiring external control mechanisms or additional layout modifications. The external voltage applied to the pad automatically translates to substrate bias through the conductive layer, making the system self-sufficient and simplifying manufacturing by eliminating complex control circuitry or additional processing steps.
3Ease of operation
If the pad and substrate are at different voltage levels, then external voltage can be applied to the pad, but ohmic resistance increases and latch-up phenomena may occur
Solution Approach 1:
The conductive type conversion layer acts as an intermediary between the pad and the semiconductor substrate. It provides a low-resistance electrical connection that ensures the pad and substrate operate at the same voltage level. This intermediary structure prevents voltage mismatches that would otherwise cause increased ohmic resistance and potential latch-up phenomena, while still allowing external voltage to be freely applied to the pad.
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 allows the semiconductor substrate to function as a bulk bias without additional layout changes, reducing ohmic resistance and preventing latch-up phenomena by ensuring the substrate and pad share the same voltage level, enhancing the semiconductor device's operational efficiency.
Implementation Method 1
A junction area having a high concentration of doped impurity ions is located in the semiconductor substrate. At least a portion of the polylayer portion is electrically connected to the junction area. The metal layer receives an externally applied voltage and transfers the received voltage to the semiconductor substrate.
Data Source
AI summary
A semiconductor device pad is configured to have the same voltage level as that of a semiconductor substrate. The pad includes a semiconductor substrate having a junction area doped with a high concentration of impurity ions, a polylayer portion at least a portion of which is electrically connected to the junction area and a metal layer portion electrically connected to the polylayer portion and receiving a voltage externally applied. The metal layer is configured to transfer the received voltage to the semiconductor substrate.