Resistive Test-Probe Tips with Compliance for Signal Integrity
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Solution Overview
Problem
Current test probe solutions for high-speed serial busses, such as DDR2 and DDR4 SDRAM, and PCIe, face challenges with precise electrical probing due to varying test point geometries and accessibility, leading to potential device damage, long setup times, and variability in signal fidelity.
Innovation Solution
The development of spring probe tips with integrated resistive elements and compliance members that reduce mechanical loads and provide precise contact, enabling high-speed signal acquisition and intuitive operation, while minimizing damage to the device under test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder-in probe tips are used for permanent contact, then contact stability is improved, but device complexity increases and setup time increases
Solution Approach 1:
The probe tip is divided into modular components: a reusable body and replaceable contact elements. This segmentation allows the complex soldering function to be isolated to small, pre-prepared contact elements rather than requiring complex assembly procedures.
Solution Approach 2:
Contact elements are pre-soldered to the probe body during manufacturing. This preliminary action transfers the complexity from the field setup phase to the factory production phase, where soldering can be performed under controlled conditions with proper equipment and expertise.
2Reliability
If solder-in probe tips are used for permanent contact, then contact stability is improved, but operation time increases due to wear and replacement needs
Solution Approach 1:
The contact elements are designed as disposable or replaceable components that can be discarded after wear or damage. The reusable probe body is retained and can accommodate new contact elements, recovering the investment in the expensive probe body while replacing only the inexpensive contact elements.
Solution Approach 2:
Contact elements are made as inexpensive, easily replaceable components compared to the expensive probe body. This allows frequent replacement of worn contact elements without significant cost, extending the overall operational life of the probe system.
3Duration of action of stationary object
If solder-in probe tips are used, then contact permanence is improved, but manufacturing precision decreases due to variability in solder connections
Solution Approach 1:
Multiple identical contact elements can be manufactured with precise, controlled solder joints in a factory setting. These standardized contact elements can then be swapped into the probe body, ensuring consistent electrical characteristics without requiring precise field soldering operations.
4Reliability
If semi-permanent probe contacts are used, then contact stability is improved, but ease of operation decreases due to dexterity requirements
Solution Approach 1:
The probe system is segmented into a stable, reusable body and easily exchangeable contact elements. This segmentation separates the functions of stability (provided by the rigid body) from ease of operation (provided by the simple contact element replacement mechanism).
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
These probe tips offer superior visibility and faster debugging capabilities, reducing signal fidelity variability and setup times, and providing better physical and electrical control over the contact area, suitable for diverse product classes.
Implementation Method 1
a resistive element electrically connected to the second end of the tip component along the signal-flow axis, the resistive element being configured to provide electrical impedance to an electrical signal passing through the resistive element
Implementation Method 2
a compliance member configured to allow movement of the tip component in a first axial direction along the signal-flow axis of the test-probe tip when a mechanical force applied to the tip component in the first axial direction
Data Source
AI summary
A test-probe tip having a tip component, a resistive element, and a compliance member. The tip component is configured to electrically connect to a device under test at a first end of the tip component. The resistive element is electrically connected to a second end of the tip component along a signal-flow axis. The resistive element is configured to provide electrical impedance to an electrical signal passing through the resistive element. The compliance member is configured to allow movement of the tip component in a first direction when a mechanical force applied to the tip component in the first direction and to cause movement of the tip component in an opposite, second direction when the mechanical force applied to the tip component is removed or reduced. Architectures for the resistive element are also described.