Multilayer Interdigitated Power Delivery Structure for Low Impedance
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Solution Overview
Problem
High impedance in power distribution networks leads to unacceptable levels of power noise, particularly in integrated circuits, IC packages, and printed circuit boards, due to high inductance, which affects reliable power delivery.
Innovation Solution
The implementation of interdigitated conductors on multiple layers with varying voltages and orientations to reduce inductance, thereby decreasing overall impedance and power noise, by configuring conductors to minimize current loop area and width, and using parallel coupling to reduce effective inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power distribution network structure is used, then simple structure is maintained, but high impedance and power noise occur
Solution Approach 1:
The power distribution network is segmented into multiple conductor layers with different orientations. Each layer is divided into multiple conductors that are interleaved or overlapping, creating a segmented structure that reduces inductance while maintaining manageable complexity through modular design
Solution Approach 2:
The solution transitions from a single-plane conductor configuration to a multi-layer three-dimensional structure. Conductors are arranged in multiple layers with varying orientations (horizontal, vertical, diagonal), adding spatial dimensions to the power distribution network to reduce impedance without excessive complexity
2Reliability
If conductor area is increased to reduce impedance, then power noise decreases, but device area increases
Solution Approach 1:
Instead of increasing conductor area in a single plane, the solution utilizes the third dimension by stacking multiple conductor layers. This vertical arrangement reduces the footprint area while achieving equivalent or better impedance reduction through increased effective conductor area in three-dimensional space
Solution Approach 2:
Multiple conductors from different layers are merged or overlapping in the vertical dimension, creating an interleaved structure where conductors from different layers work together to reduce impedance. This merging approach achieves superior power noise reduction without proportionally increasing the device footprint
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 effectively lowers the impedance of the power distribution network, resulting in reduced power noise across specific frequency ranges, enhancing the reliability of power delivery in electronic circuits.
Implementation Method 1
The inductance (and therefore the impedance) of power delivery structure 102 may be unacceptably high
Implementation Method 2
If the total impedance of the power distribution network is high, then the power distribution network may introduce an unacceptably high amount of power noise
Data Source
AI summary
A structure for delivering power is described. In some embodiments, the structure can include conductors disposed on two or more layers. Specifically, the structure can include a first set of interdigitated conductors disposed on a first layer and oriented substantially along an expected direction of current flow. At least one conductor in the first set of interdigitated conductors may be maintained at a first voltage, and at least one conductor in the first set of interdigitated conductors may be maintained at a second voltage, wherein the second voltage is different from the first voltage. The structure may further include a conducting structure disposed on a second layer, wherein the second layer is different from the first layer, and wherein at least one conductor in the conducting structure is maintained at the first voltage.