Voltage Stabilization for Device Under Test Using Feed-Forward Compensation
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Solution Overview
Problem
Existing test systems face challenges in stabilizing voltage at a device under test (DUT) due to deviations caused by digital signals and transient currents, which can lead to inconsistent test results.
Innovation Solution
A method and system that identify characteristics of voltage deviations prior to testing, generating a second voltage based on these characteristics to shape and reduce the deviations, using a feed-forward approach that iteratively adjusts the voltage output to stabilize the voltage at the DUT, incorporating a voltage sensor and control system to account for unspecified loads and conduit properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage source is used to power a device under test during testing, then the device can be tested with digital signals, but voltage deviations occur due to transient currents causing inconsistent test results
Solution Approach 1:
The system performs preliminary characterization of transient current effects before actual testing by applying test patterns and measuring voltage deviations. These measured characteristics are stored and used to generate compensating voltage adjustments during subsequent tests, eliminating the need for real-time feedback while ensuring consistent voltage stability.
Solution Approach 2:
The system proactively counteracts voltage deviations by pre-calculating compensating voltage adjustments based on characterized transient current effects. The compensation voltage is applied in advance to counterbalance the expected voltage drops or spikes caused by transient currents during digital signal testing, thereby maintaining stable voltage conditions.
2Stability of the object's composition
If voltage compensation is applied to stabilize voltage at the DUT, then voltage deviations are reduced, but additional control circuitry and calibration procedures are required
Solution Approach 1:
The system introduces a compensation voltage source as an intermediary element that mediates between the main voltage source and the DUT. This compensation source generates corrective voltage adjustments based on pre-characterized transient effects, acting as a buffer that simplifies the control logic by decoupling the voltage stabilization function from the main test control system.
Solution Approach 2:
The system performs self-characterization during initial calibration by automatically applying test patterns, measuring voltage deviations, and storing the characteristics for later compensation. This self-service approach eliminates the need for complex external calibration equipment or manual measurement procedures, reducing overall system complexity while achieving accurate voltage stabilization.
Data Source
AI summary
An example method of stabilizing a voltage at a device under test (DUT) includes identifying one or more characteristics of a deviation in a first voltage to appear at the DUT. The deviation may result from a digital signal and a concomitant transient current in the DUT. The digital signal may be part of a test flow to be sent over one or more test channels of automatic test equipment (ATE) to the DUT. The one or more characteristics may be identified prior to sending the test flow to the DUT. The method also includes generating a second voltage to apply to the DUT. The second voltage may be based on the one or more characteristics and being shaped to reduce the deviation.