Resistor-Integrated Ground Reference Leads for High-Frequency Probes

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Solution Overview

Problem

The self-inductance of ground reference leads in probe heads degrades high frequency electrical signal measurements, leading to reduced rise time and higher overshoot, and existing solutions to reduce inductance either limit flexibility or applicability to specific DUTs.

Innovation Solution

A ground reference lead with a flexible body and integrated resistors in the electrical contact pathway to cancel self-inductance, allowing longer leads for wider DUT compatibility without signal quality loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the length of the ground reference lead is increased to extend measurement range, then adaptability to various DUTs is improved, but self-inductance increases causing signal degradation

Engineering Contradiction:

Improvemeasurement rangeVSAvoidsignal quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A resistor is introduced as an intermediary element in the ground reference lead to counteract the harmful effect of self-inductance. The resistor value is specifically chosen to match the inductive reactance at the measurement frequency, creating a compensating effect that maintains signal integrity while allowing longer lead lengths for extended measurement range.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical parameters of the ground reference lead are modified by adding a resistor with specific resistance value that changes the overall impedance characteristics. This parameter adjustment compensates for the inductive effects that worsen with increased lead length, enabling the use of longer leads without signal degradation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the self-inductance of the ground reference lead is reduced by adjusting its shape, then signal quality is improved, but flexibility is reduced

Engineering Contradiction:

Improvesignal qualityVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Instead of modifying the physical shape of the ground reference lead, a resistor is introduced as an intermediary element to counteract the inductive effects. This approach maintains the flexible, industry-standard flat linear shape while compensating for inductance through electrical means, preserving both signal quality and operational flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mechanical approach of shaping the lead to reduce inductance is replaced with an electrical compensation method using a resistor. This substitution allows the lead to maintain its flexible mechanical structure while achieving the desired reduction in inductive effects through electrical parameter adjustment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the length of the ground reference lead is reduced to minimize self-inductance, then signal quality is improved, but adaptability to different DUTs is reduced

Engineering Contradiction:

Improvesignal qualityVSAvoidmeasurement application range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

A resistor is introduced as a compensating intermediary element that allows the use of longer ground reference leads. The resistor counteracts the inductive reactance, enabling extended lead lengths to be used without signal degradation, thereby expanding the range of measurable DUT configurations while maintaining signal quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical parameters of the ground reference lead system are changed by adding a series resistor. This parameter modification shifts the impedance characteristics to compensate for inductance, allowing longer lead lengths to be used across various DUT applications without sacrificing signal quality or measurement adaptability.

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

Compensates for self-inductance, enabling longer ground reference leads that maintain high signal quality across various DUT configurations, enhancing measurement flexibility and accuracy.

Implementation Method 1

a resistor that is electrically arranged in the electrical contact pathway... Compensates for self-inductance, enabling longer ground reference leads that maintain high signal quality

Methodology Applied

Scientific EffectSelf-inductance compensation: Electrical Resistance

Data Source

PatentUS12405291B2Ground reference lead for use with electronics testing and measurement probes

Publication Date: 2025.09.02 PMK MESS & KOMMUNIKATIONSTECHNIK GMBH

AI summary

Ground reference lead for measuring high frequency electrical signals using a probe head. The ground reference lead comprises a flexible body, a probe socket arranged on a probe end of the flexible body, a ground socket arranged on a ground end of the flexible body, an electrical contact pathway that electrically connects the probe socket and the ground socket and that extends at least partially within the flexible body, and a resistor that is electrically arranged in the electrical contact pathway.