High Impedance Compliant Probe Tip for Signal Fidelity
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Solution Overview
Problem
Existing probe tips for high-speed serial bus devices are inadequate due to potential damage to the device under test, long setup times, and variability in signal fidelity, particularly in semi-permanent connections like soldering or epoxying, which require exceptional dexterity and result in costly replacements with reduced signal quality.
Innovation Solution
The development of probe tips with a compliance member or force deflecting assembly, including a barrel component, plunger base, and resistive/impedance element, utilizing a spring mechanism for precise, height-compliant, and light-pressure contact, reducing device loading and enhancing signal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering or conductive epoxying is used to create semi-permanent probe contacts, then connection stability is improved, but setup time increases and device complexity increases
Solution Approach 1:
The patent employs disposable solder-in probe tips that are designed for single-use or limited-use applications. These probe tips are inexpensive enough to be replaced quickly without requiring complex repair procedures, thus reducing setup time while maintaining connection stability during the actual probing operation. The disposable nature eliminates the need for delicate soldering operations during debugging, as each probe tip is pre-soldered to a rigid substrate.
Solution Approach 2:
The probe tip is segmented into distinct components: a rigid substrate with pre-soldered contact points and a separate compliance mechanism. This segmentation allows the compliance element to be replaced independently of the expensive probe body, reducing overall setup time and cost while maintaining connection reliability during use.
2Reliability
If solder-in probe tips are used for repeated connections, then connection stability is improved, but the probe tips wear out quickly requiring expensive replacements
Solution Approach 1:
The patent accepts that solder-in probe tips have limited durability and designs them as disposable components. By making them inexpensive and easy to replace, the system maintains high connection stability during each use while avoiding the need for expensive, complex repair procedures. The rigid substrate provides stable electrical connections, but the overall assembly is designed for replacement rather than repair.
3Ease of operation
If compliance is added to probe tips for better positioning, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent incorporates a compliance element made from flexible materials such as elastomers or thin metallic films. These flexible components provide the necessary compliance for positioning the probe tip while maintaining a relatively simple overall structure. The flexible material allows the probe tip to conform to slight variations in test point position without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The probe tip uses composite construction combining a rigid substrate (for electrical stability) with a flexible compliance element (for positioning). This composite approach achieves both ease of operation through compliance and connection stability, while keeping the overall device complexity manageable through the use of standard materials and straightforward assembly.
4Reliability
If soldering operations are performed on test points, then connection stability is improved, but the device under test may be damaged
Solution Approach 1:
The probe tips are pre-soldered to a rigid substrate during manufacturing, before use. This preliminary action eliminates the need for field soldering operations that could damage the device under test. The pre-soldered contacts provide stable electrical connections, and the compliance element ensures proper positioning without requiring additional soldering steps at the test site.
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 solution provides precise, quick, and intuitive connection with improved signal fidelity and reduced setup time, enabling efficient high-speed signal acquisition and debugging without damaging the device under test.
Implementation Method 1
A spring mechanism may be trapped or otherwise positioned within the barrel component and the plunger base may be configured to slide axially inside the barrel component and be acted upon by the spring mechanism therein to advantageously create a compression resistance
Implementation Method 2
a resistive/impedance element that is also coupled with a tip component
Data Source
AI summary
A test probe tip can include a compliance member or force deflecting assembly and a tip component. The compliance member or force deflecting assembly can include a plunger component and a barrel component to receive the plunger component, wherein the plunger component is configured to slide axially inside the barrel component. The test probe tip can also include a spring mechanism within the barrel component to act on the plunger component, and a resistive/impedance element coupled with the plunger component at one end and with the tip component at the opposite end, the resistive/impedance element including at least one rod having a semi-cylindrical form and a resistive material situated thereon.