Inductive Tuning of LGA Circuit Pads for Parasitic Capacitance

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Solution Overview

Problem

Integrated circuits with land grid array (LGA) packages experience parasitic capacitance that negatively impact return and insertion loss, necessitating a solution to compensate for these capacitances.

Innovation Solution

Implementing an inductive tuning element with a trace structure of targeted inductance to compensate for parasitic capacitance by performing model extraction, determining target inductance, and conducting sensitivity analysis on the trace structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pads and anti-pads are implemented in the electrical circuit, then electrical connections are established, but parasitic capacitance is introduced that deteriorates return loss and insertion loss

Engineering Contradiction:

Improvereturn lossVSAvoidparasitic capacitance

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces an inductive tuning element that converts the harmful parasitic capacitance into a beneficial effect by using inductance to compensate for the capacitance. The inductive element creates an opposing reactance that cancels out the parasitic capacitive effect, thereby improving return loss and insertion loss performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent modifies the electrical parameters of the circuit by adding an inductive component with specific inductance value. This parameter change allows tuning of the circuit's impedance characteristics to compensate for parasitic capacitance, transforming the circuit's electrical behavior to achieve better performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If pads and anti-pads are implemented in the electrical circuit, then electrical connections are established, but parasitic capacitance is introduced that deteriorates insertion loss

Engineering Contradiction:

Improveinsertion lossVSAvoidparasitic capacitance

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The inductive tuning element converts the harmful parasitic capacitance into a beneficial effect by using inductance to compensate for the capacitance. The inductive element creates an opposing reactance that cancels out the parasitic capacitive effect, thereby improving insertion loss performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

Inventive Principle:

Principle #35Parameter changes

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

Significantly improves return and insertion loss by effectively compensating for parasitic capacitance, enhancing the performance of LGA packages.

Implementation Method 1

Implementing an inductive tuning element with a trace structure of targeted inductance to compensate for parasitic capacitance

Methodology Applied

Scientific EffectInductive tuning: Electromagnetic Induction

Data Source

PatentUS20260082481A1Systems and methods for implementing an electrical circuit including an inductive tuning element

Publication Date: 2026.03.19 ADVANCED MICRO DEVICES INC

AI summary

The disclosed electrical circuit can include a circuit connection structure and a pad provided to the circuit connection structure. The disclosed electrical circuit can additionally include an inductive tuning element provided to the circuit connection structure. The inductive tuning element can compensate parasitic capacitance of the pad. Various other methods, systems, and computer-readable media are also disclosed.