IC Package Band Stop Filter Using Vertical LC Resonance
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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 the IC package, comprising a ground plane, a plate, and a dielectric layer forming a capacitive device, along with an inductive device connected to the plate, creating an LC circuit that reduces high-frequency noise components. This configuration occupies less area and avoids additional processing steps that increase manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional noise filtering approaches are used, then noise suppression capability is provided, but area occupancy increases and manufacturing costs increase
Solution Approach 1:
The patent merges the noise filtering function with the existing power distribution network by integrating inductive devices and capacitive devices directly into the PPI structure. The inductive device is formed in one metal layer while the capacitive device uses plates in adjacent metal layers, combining filtering functionality with the power distribution infrastructure rather than adding separate filtering components.
Solution Approach 2:
The patent transitions from planar filtering approaches to three-dimensional filtering by utilizing vertical stacking of metal layers. The capacitive device uses plates in different metal layers separated by dielectric layers, creating vertical capacitance that eliminates the need for large horizontal area occupancy while maintaining filtering effectiveness.
2Object-affected harmful factors
If traditional noise filtering approaches are used, then noise suppression capability is provided, but manufacturing costs increase due to additional processing steps
Solution Approach 1:
The filtering structures are merged with the power distribution network fabrication process. The inductive and capacitive devices are formed using the same metal layers and dielectric layers that constitute the PPI, eliminating the need for separate filtering component fabrication and reducing overall manufacturing complexity.
Solution Approach 2:
The existing PPI structure serves dual purposes: power distribution and noise filtering. The metal layers and dielectric layers that form the power distribution network automatically form the inductive and capacitive elements of the filter, making the structure self-sufficient for both functions without requiring additional dedicated components or processes.
3Use of energy by moving object
If power supply voltage decreases, then power consumption is reduced, but sensitivity to noise increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing noise filtering capability within the power distribution network before noise becomes a problematic issue. The inductive and capacitive devices are integrated into the PPI structure to proactively suppress noise at its source, preventing noise from affecting the sensitive low-voltage IC operations rather than attempting to mitigate noise after it occurs.
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 components while minimizing area usage and production costs, enhancing the noise filtering capabilities of IC packages compared to traditional methods like printed circuit board filters.
Implementation Method 1
a ground plane in a first metal layer of an IC package, 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
Implementation Method 3
the resultant LC circuit functions to reduce a high frequency noise component of a signal transmitted from a first terminal of the filter structure to a second terminal of the filter structure
Data Source
AI summary
A filter structure includes a ground plane in a first metal layer of an IC package, a plate in a second metal layer of the IC package, a dielectric layer between the ground plane and the plate, the ground plane, the dielectric layer, and the plate thereby being configured as a capacitive device. An inductive device in a third metal layer of the IC package is electrically connected to the plate, and a perimeter of the plate is aligned with a perimeter of the inductive device.