Modular Probe With Impedance Matching And Compensation
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Solution Overview
Problem
Conventional probes for measurement and test instruments, such as oscilloscopes, face challenges with connectivity, accuracy, and flexibility due to fixed cable lengths, specialized connectors, and limited compatibility with varying capacitances and instruments, leading to inefficiencies in measurement systems.
Innovation Solution
A modular probe design featuring interchangeable connectors and compensation networks in both the probe-tip and build-out adaptors, allowing for flexible connection options and accommodating different capacitances, enabling the use of standard coaxial cables and connectors like SMB, which can be easily swapped for different attenuation levels and instrument compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional probes use fixed cable lengths and specialized connectors, then connectivity and measurement accuracy are maintained, but flexibility and adaptability to different instruments and capacitances are reduced
Solution Approach 1:
The probe is divided into separate modular components: a probe tip assembly with connector, a cable assembly, and a build-out assembly with compensation network. This segmentation allows each component to be optimized independently and enables reconfiguration for different measurement requirements while maintaining overall measurement accuracy through controlled impedance interfaces between modules.
Solution Approach 2:
The probe design incorporates universal interfaces and standardized connectors (such as SMA or BNC) that can connect to various measurement instruments. The compensation network can be adjusted to accommodate different instrument input capacitances, making the probe adaptable to multiple instruments and applications while maintaining measurement precision.
2Adaptability or versatility
If conventional probes use fixed cable lengths, then signal integrity is maintained, but adaptability to different cable capacitances and instruments is limited
Solution Approach 1:
The probe incorporates an adjustable compensation network that can be dynamically tuned to match different cable capacitances and instrument inputs. This dynamic adjustment capability allows the probe to maintain signal integrity across varying cable lengths and instrument configurations, resolving the contradiction between adaptability and reliability.
3Ease of operation
If conventional probes use specialized connectors, then measurement accuracy is maintained, but ease of operation and interchangeability are reduced
Solution Approach 1:
The probe uses standardized universal connectors (SMA, BNC, or other common interfaces) that can be easily interchanged and are compatible with most measurement instruments. The compensation network is designed to accommodate the varying capacitances introduced by different cable and instrument combinations, maintaining measurement accuracy while significantly improving ease of operation and interchangeability.
4Adaptability or versatility
If conventional probes use fixed designs, then manufacturing simplicity is maintained, but device complexity and lack of flexibility increase
Solution Approach 1:
By segmenting the probe into standardized modular components with controlled impedance interfaces, the design achieves flexibility through reconfigurability while keeping individual module complexity low. The modular structure allows simple manufacturing of each component that can then be assembled in different configurations for various applications.
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 modular probe design enhances measurement accuracy and flexibility by allowing interchangeable components, accommodating varying cable lengths and instrument capacitances, reducing the need for specialized cables and probes, and facilitating easier access to compensation adjustments, thus improving the usability and cost-effectiveness of measurement systems.
Implementation Method 1
accommodating different capacitances of varying cable lengths
Implementation Method 2
The disconnectable build-out adaptor may include a compensation adjustment control circuit for accommodating different capacitances of varying lengths of the cable
Implementation Method 3
corrective circuits included in the disconnectable probe-tip adaptor and/or in the build-out adaptor for at least partially terminating each end of the cable with a characteristic impedance of the cable to attenuate reflections in the cable assembly
Data Source
AI summary
A novel modular probe may include an interchangeable (connectable/disconnectable) probe-tip adaptor having a tip connector for coupling to a device under test, and further having a probe-tip terminal for coupling to a first assembly connector of a cable assembly, which further has a second assembly connector for coupling to a first build-out terminal of a build-out adaptor, which also has a second build-out terminal for coupling to an assembly connector of an interchangeable instrument connector cable assembly, which also has an instrument-end connector for coupling to a measurement instrument. The built-out adaptor may include a compensation adjustment circuit for compensating the probe for varying system capacitances. The probe may include one or more corrective circuits in the interchangeable probe-tip adaptor and/or in the build-out adaptor for at least partially terminating each end of the cable assembly with a characteristic impedance of the cable in the cable assembly to attenuate reflections.