IC Pad Layout Segmentation for High-Frequency Noise Discharge
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Solution Overview
Problem
Conventional IC chip pad layouts fail to effectively discharge noise at high frequencies due to increased parasitic inductance, leading to interference with signal pads.
Innovation Solution
The proposed pad layout includes independent guard rings connected to separate non-signal pads, allowing for independent noise discharge paths, and optionally multiple connections to non-signal pads and doped regions to reduce inductive and capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard rings are connected to a common grounding pad through traces, then noise can be discharged at low frequencies, but parasitic inductance increases at high frequencies causing noise discharge failure
Solution Approach 1:
The patent divides the common grounding pad into multiple separate grounding pads (first grounding pad, second grounding pad, etc.). Each guard ring is connected to its own dedicated grounding pad through a shorter trace, rather than all guard rings sharing a common grounding path. This segmentation reduces the total parasitic inductance by eliminating the cumulative inductance of multiple guard rings sharing a common trace and grounding pad structure.
Solution Approach 2:
The patent extracts the grounding function from a single common grounding pad and distributes it to multiple separate grounding pads. Each grounding pad serves a specific guard ring, removing the harmful cumulative parasitic inductance effect that occurred when multiple guard rings shared a common grounding path.
2Speed
If working frequency is increased to improve IC chip performance, then signal transmission speed increases, but noise interference increases due to stronger parasitic effects
Solution Approach 1:
By segmenting the grounding structure into multiple independent grounding pads and traces, the patent reduces the parasitic inductance that limits high-frequency performance. This allows the IC chip to operate at higher frequencies with reduced noise interference, as each guard ring has its own low-inductance path to ground.
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 smoother noise discharge at high frequencies, minimizing interference with signal pads and improving IC chip performance.
Implementation Method 1
the parasitic effects, for example, is the parasitic inductance of the trace 330, the grounding pad 312 and the grounding wire 340
Data Source
AI summary
A pad layout suitable for being applied on a metal interconnection structure of an integrated circuit chip is provided. The pad layout includes a first signal pad, a second signal pad, a first non-signal pad, a second non-signal pad, a first trace, a second trace, a first guard ring and a second guard ring. The second signal pad is located adjacent to the first signal pad. The first non-signal pad is located adjacent to the first signal pad. The second signal pad is located adjacent to the second signal pad. The first guard ring surrounds the first signal pad and is connected to the first non-signal pad through the first trace. The second guard ring surrounds the second signal pad and is connected to the second non-signal pad through the first trace.