Package Substrate Diodes for ESD Protection
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Solution Overview
Problem
Microelectronic packages face challenges with electrostatic discharge (ESD) that can cause partial to full breakdown of integrated circuits, particularly due to the large on-chip real-estate consumption and capacitive loading of traditional on-die diodes, which are undesirable in modern, high-speed, and high-frequency applications.
Innovation Solution
The integration of Schottky or pn-junction diodes in the package substrate between ground and signal lines or power and signal lines provides ESD protection, utilizing oxide-based or organic semiconductor materials like gallium oxide and copper phthalocyanine, which are easily doped and offer faster reaction times compared to traditional silicon-based diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional on-die diodes are used for ESD protection, then ESD protection is provided, but on-chip real-estate is consumed and capacitive loading increases
Solution Approach 1:
The ESD protection function is segmented from the die and relocated to the package substrate. The diode structure is divided into separate components: the diode element is formed in the package substrate while the die remains separate, allowing ESD protection without occupying on-chip space.
Solution Approach 2:
The ESD protection diode is extracted from the die and placed in the package substrate. This extraction removes the harmful factor (real-estate consumption) while preserving the useful function (ESD protection) through the package-level diode structure.
2Reliability
If traditional on-die diodes are used for ESD protection, then ESD protection is provided, but capacitive loading increases
Solution Approach 1:
The capacitive loading issue is addressed by segmenting the ESD protection function from the high-speed signal path on the die. The package substrate diode is positioned to provide protection while minimizing interference with high-speed signals, reducing capacitive loading effects on critical circuit paths.
3Speed
If oxide-based or organic semiconductor materials are used in diodes, then faster reaction times are achieved, but material complexity increases
Solution Approach 1:
The patent changes the material parameters by using oxide-based semiconductors (e.g., gallium oxide) or organic semiconductor materials instead of traditional silicon. These materials inherently provide faster reaction times for ESD protection while being easily doped, though they introduce material complexity that is managed through the package substrate integration approach.
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 solution offloads ESD protection from the die to the package substrate, freeing up on-die space, reducing capacitive loading, and providing robustness against ESD events by effectively shunting excess current to ground, thus enhancing the reliability of microelectronic packages.
Implementation Method 1
electrostatic discharge (ESD) may refer to a sudden onset of charge transfer (i.e., electron flow) between two objects with different electric potentials
Implementation Method 2
a diode communicatively coupled with the signal line and the conductive line
Implementation Method 3
The integration of Schottky or pn-junction diodes in the package substrate between ground and signal lines or power and signal lines provides ESD protection
Implementation Method 4
The integration of Schottky or pn-junction diodes in the package substrate
Implementation Method 5
utilizing oxide-based or organic semiconductor materials like gallium oxide and copper phthalocyanine
Data Source
AI summary
Embodiments may relate to a package substrate that is to couple with the die. The package substrate may include a signal line that is communicatively coupled with the die. The package substrate may further include a conductive line. The package substrate may further include a diode communicatively coupled with the signal line and the conductive line. Other embodiments may be described or claimed.