Relay Circuit Layout for Low-Noise Loopback Measurement
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Solution Overview
Problem
Existing electrical connection apparatuses for inspecting objects suffer from significant signal loss and noise in loopback circuits, which hinder accurate measurement of electrical characteristics.
Innovation Solution
The proposed solution involves an electrical connection apparatus with a relay circuit that includes a common terminal, first and second wiring terminals, and inspection terminals, which can selectively connect to form a loopback circuit with a capacitor or coupled wiring, reducing signal path length and noise by integrating the relay circuit onto a wiring board close to the probes, allowing for precise control of signal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the relay circuit is integrated onto the wiring board close to the probes, then signal path length is reduced and noise is minimized, but device complexity increases
Solution Approach 1:
The relay circuit is integrated directly onto the wiring board, merging the relay functionality with the existing wiring board structure. This integration eliminates separate relay components and reduces the number of connection points, thereby shortening the signal path and reducing noise while maintaining measurement precision.
Solution Approach 2:
The relay circuit is positioned in the spatial dimension close to the probes by integrating it onto the wiring board. This dimensional repositioning reduces the physical distance the signal must travel, minimizing signal loss and noise accumulation along the path.
2Loss of energy
If the signal path length is minimized, then signal loss and noise are reduced, but the flexibility in arranging the relay circuit is constrained
Solution Approach 1:
The wiring board is designed to serve multiple functions: it provides electrical connections for probes and simultaneously integrates the relay circuit. This multi-functionality allows the relay circuit to be positioned optimally for minimal signal path length while maintaining the wiring board's universal applicability for different probe configurations.
Solution Approach 2:
The relay circuit is positioned locally close to the probes where it is most needed for signal conditioning. This local placement optimizes the signal path for minimal loss and noise in the critical measurement region, while the overall wiring board design maintains flexibility for different application requirements.
Data Source
AI summary
An electrical connection apparatus includes terminals for inspection, a wiring board, and a relay circuit. The wiring board includes first electrodes electrically connected to any one of the terminals for inspection, connecting wiring connected to any one of the first electrodes, and second electrodes electrically connected to any one of the first electrodes via the connecting wiring. The relay circuit is connected to first wiring and second wiring. The relay circuit includes a common terminal, a first wiring terminal connected to the first wiring, a second wiring terminal connected to the second wiring, and a first inspection terminal and a second inspection terminal electrically connected to an inspection device. The relay circuit selectively connects the first wiring terminal to either the common terminal or the first inspection terminal, and selectively connects the second wiring terminal to either the common terminal or the second inspection terminal.