Band Stop Filter Structure for IC Package Noise Suppression
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Solution Overview
Problem
Integrated circuit (IC) packages face increased sensitivity to noise such as simultaneous switching noise (SSN) and ground bounce noise (GBN) due to rising complexity and decreasing power supply voltages, with existing noise filtering approaches being inefficient in terms of area occupancy and manufacturing costs.
Innovation Solution
A band stop filter structure is implemented within IC packages, comprising a ground plane, a plate, and a dielectric layer, forming a capacitive device, and an inductive device connected to the plate, which reduces high-frequency noise through an LC circuit configuration, occupying less area and avoiding additional costly processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional noise filtering approaches are used in IC packages, then noise suppression is achieved, but area occupancy increases and manufacturing costs increase
Solution Approach 1:
The patent combines the noise filtering function with existing IC package interconnect structures by integrating inductive and capacitive elements into the power distribution network. The inductive device is formed in series with power delivery paths using existing metal layers, while capacitive devices are created using combinations of existing conductive layers and dielectric materials. This merging approach enables noise suppression without requiring separate dedicated filter structures, thereby reducing area occupancy while maintaining effective noise filtering performance
Solution Approach 2:
The patent makes existing IC package structures serve multiple functions: the power distribution network simultaneously performs power delivery and noise filtering, the interconnect structures serve both signal transmission and inductive/capacitive filtering purposes. By designing the interconnect geometry to provide specific inductance values and combining multiple dielectric layers to create capacitive effects, the same structures that distribute power also suppress noise, eliminating the need for separate filtering components and reducing overall area requirements
2Object-affected harmful factors
If traditional noise filtering approaches are used in IC packages, then noise suppression is achieved, but manufacturing costs increase due to additional processing steps
Solution Approach 1:
The patent merges noise filtering functionality into the standard IC package manufacturing process by forming inductive devices using existing metal layer patterning and deposition steps, and creating capacitive devices by utilizing combinations of existing dielectric and conductive layers. No separate processing steps are required beyond what is already needed for power distribution network formation, thereby avoiding additional manufacturing costs while achieving effective noise suppression
Solution Approach 2:
The patent designs the interconnect structures to automatically provide noise filtering characteristics through their geometric configuration and material properties. The inductance is determined by the trace geometry and layout, while capacitance arises from the inherent dielectric layers between conductors. These structures self-generate the filtering effect without requiring additional components or processing, making the manufacturing process cost-effective while achieving noise suppression
3Adaptability or versatility
If IC packages use decreasing power supply voltages and increasing complexity, then functionality is improved, but sensitivity to noise increases
Solution Approach 1:
The patent creates frequency-dependent filtering characteristics by designing LC circuits with specific inductive and capacitive values that target particular noise frequency ranges. The inductive devices are configured to present high impedance at noise frequencies while maintaining low DC resistance for power delivery, and capacitive devices are designed to shunt high-frequency noise to ground. This dynamic frequency-selective behavior enables effective noise suppression across different operating conditions while maintaining the power distribution network's ability to support increasing IC complexity and varying power requirements
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
The band stop filter structure effectively reduces high-frequency noise while minimizing area usage and manufacturing costs, enhancing the performance of IC packages by improving noise suppression efficiency.
Implementation Method 1
a plate in a second metal layer of the IC package, and a dielectric layer between the ground plane and the plate, thereby forming a capacitive device
Implementation Method 2
An inductive device in a third metal layer of the IC package is electrically connected to the plate
Data Source
AI summary
A filter structure includes a capacitive device and an inductive device. The capacitive device includes a ground plane in a first metal layer of an integrated circuit (IC) package, a plate in a second metal layer of the IC package, and a dielectric layer between the ground plane and the plate. The inductive device includes first and second conductive paths in a third metal layer of the IC package, each of the first and second conductive paths is electrically connected to the plate and has a width w, the first and second conductive paths are separated by a spacing s, and a ratio s/w has a value ranging from 1 to 2.