Vss Substrate Current Limiter for Faster ESD-Safe Assembly
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Solution Overview
Problem
During the assembly of microelectronic devices, charge accumulation in capacitors of the Vss plane can lead to electrostatic discharge (ESD) events, causing high peak currents that can damage circuitry due to insufficient or time-consuming grounding processes.
Innovation Solution
The substrate includes Vss units coupled through conductive traces and a conductive rail, allowing for efficient grounding of capacitors by connecting a ground to the conductive rail, and incorporating current limiters between adjacent Vss units or between Vss units and the conductive rail to manage peak currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grounding processes are performed to discharge accumulated charge in capacitors, then ESD damage is prevented, but production time increases due to the time-consuming nature of grounding operations
Solution Approach 1:
The patent incorporates current limiters into the substrate design during manufacturing, so that when capacitors accumulate charge during assembly, the discharge path is already prepared and immediately available. This eliminates the need for separate grounding operations between assembly steps, as the protective mechanism is pre-configured in the substrate itself.
Solution Approach 2:
The substrate is designed with built-in current limiters that automatically activate when capacitors need discharge. The system serves itself by providing the protective function through its own structure rather than requiring external grounding equipment or processes. The conductive traces and current limiters work autonomously to prevent ESD damage whenever charge accumulation occurs.
2Productivity
If conventional packaging processes are used without current limiters, then production speed is maintained, but circuitry is vulnerable to damage from ESD events
Solution Approach 1:
The patent merges the protective function into the substrate structure by integrating current limiters with the conductive traces and Vss units. This combination allows the substrate to simultaneously provide electrical connectivity and ESD protection without adding separate protective components or processes that would slow down production.
Solution Approach 2:
The current limiters modify the electrical parameters of the substrate by introducing controlled resistance or current limiting characteristics into the conductive paths. This parameter change enables the substrate to limit peak currents during ESD events while maintaining normal operational current flow, thereby protecting circuitry without affecting production speed.
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 discharge of capacitors without physical grounding, reducing the risk of ESD damage and allowing for faster production processes by minimizing the time required for grounding.
Implementation Method 1
incorporating current limiters between adjacent Vss units or between Vss units and the conductive rail to manage peak currents
Implementation Method 2
Vss units coupled through conductive traces and a conductive rail, allowing for efficient grounding of capacitors by connecting a ground to the conductive rail
Data Source
AI summary
A substrate is provided that includes a current limiter between Voltage Source (Vss) units on a Vss plane. The Vss plane includes a first Vss unit configured to provide a Vss signal to a first semiconductor device and a second Vss unit configured to provide a Vss signal to a second semiconductor device. The first and second Vss units include a first and second capacitor, respectively. The first and second capacitors are coupled through the current limiter, which can decrease the damage caused by electrostatic discharge events.