Low Glitch Summing Node Switcher for Four-Quadrant DUT Testing
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Solution Overview
Problem
Existing electrical measurement systems lack the capability to efficiently operate as both current-limited voltage sources and voltage-limited current sources across all four quadrants, particularly in handling positive and negative voltages and currents, which is essential for testing and minimizing damage to devices under test.
Innovation Solution
A measurement system with a DUT interface, differential amplifier, and multi-pole switcher that allows for selectable feedback paths, enabling the system to operate as a current-limited voltage source or voltage-limited current source across all four quadrants by using switches and reference voltages to control the flow of current and voltage based on set limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single apparatus is designed to operate as both current-limited voltage source and voltage-limited current source across all four quadrants, then versatility and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent implements a universal test source that can operate in all four quadrants as both current-limited voltage source and voltage-limited current source. The apparatus uses a single integrated circuit design with selectable feedback paths that enables one device to perform multiple functions (voltage sourcing, current sourcing, voltage limiting, current limiting) that would traditionally require separate dedicated circuits for each mode.
Solution Approach 2:
The patent segments the control functionality into separate feedback paths (voltage feedback path and current feedback path) that can be independently selected via switches. This segmentation allows the complex four-quadrant operation to be managed by choosing the appropriate feedback path for each operating mode, simplifying the control logic while maintaining full functionality.
2Adaptability or versatility
If feedback paths are selectively switched to change operating modes, then adaptability is improved, but switching glitches and signal instability worsen
Solution Approach 1:
The patent applies preliminary action by ensuring both feedback paths are actively maintained and tracked before switching occurs. The summing node continuously processes signals from both voltage and current feedback paths, so when switching occurs, the transition is smooth because both paths are already prepared and active, eliminating glitches that would occur with cold switching.
Solution Approach 2:
The patent merges the voltage feedback path and current feedback path into a common summing node that processes both signals simultaneously. This merging allows seamless switching between feedback paths without interruption or glitching, as the summing node is already configured to handle both signal types and can smoothly transition between them.
3Reliability
If separate voltage source and current source circuits are used, then reliability and precision are improved, but device complexity and space requirements worsen
Solution Approach 1:
The patent merges separate voltage source and current source circuits into a single integrated apparatus that can operate in all four quadrants. By combining the circuits and using a unified feedback control system with selectable paths, the patent achieves the reliability of separate dedicated circuits while eliminating the need for multiple independent devices, thus reducing overall system complexity.
Solution Approach 2:
The patent creates a universal test source that consolidates the functionality of separate voltage source, current source, voltage limiter, and current limiter circuits into one multi-functional device. This universal apparatus maintains the reliability of dedicated circuits for each function while reducing device complexity through integrated design and shared control architecture.
Data Source
AI summary
A measurement system with selectable feedback paths includes a DUT interface including a first and a second DUT sensor, the first sensor being connected to a first feedback path for providing a measure of a first DUT characteristic, the second sensor being connected to a second feedback path for providing a measure of a second DUT characteristic, the sensors having a shared reference path and each feedback path including a set point adjustment; a differential amplifier system including differential inputs and differential outputs, the differential outputs being applied to the DUT interface; and a multi-pole switcher for connecting the differential inputs to either the first feedback path and the reference path or to the reference path and the second feedback path, respectfully. The first feedback path is selected to produce a desired first DUT characteristic or the second feedback path is selected to produce a second desired DUT characteristic.