Operation-Like Wideband Signals for Accurate DUT Transfer Functions
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Solution Overview
Problem
Conventional methods for determining the transfer function of a device under test (DUT) using test signals that differ from normal operation signals result in decreased measurement accuracy due to varying power spectral density, leading to increased measurement uncertainty.
Innovation Solution
Measure the transfer function across a frequency range using a wideband signal similar to the device's normal operation, remove data points with low power spectral density, and interpolate remaining data to determine an accurate transfer function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional test signal is used for measurement, then the measurement process is simple, but the measurement accuracy decreases due to varying power spectral density
Solution Approach 1:
The patent changes the parameters of the test signal to match the power spectral density characteristics of normal operation signals. By adjusting the signal parameters (frequency distribution, power levels) to reflect real operating conditions, the measurement accuracy improves while maintaining a feasible measurement process
Solution Approach 2:
The patent applies preliminary processing to the measured data, including interpolation to fill gaps in the frequency spectrum and weighting to compensate for varying power spectral density. These preliminary actions prepare the raw measurement data for accurate transfer function determination
2Adaptability or versatility
If a wideband signal with low power spectral density at certain frequencies is used, then the signal resembles normal operation signals, but measurement uncertainty increases significantly at those frequencies
Solution Approach 1:
The patent extracts and removes the unreliable measurement data points from the frequency spectrum where the power spectral density is too low. By taking out these problematic data points and using interpolation to reconstruct the transfer function at those frequencies, the overall measurement reliability is maintained while still using a wideband signal that resembles normal operation
Solution Approach 2:
The patent introduces interpolation algorithms as intermediary processing steps between the raw measurement data and the final transfer function. These intermediaries fill in the gaps created by removing low-power spectral density data points, maintaining measurement certainty while allowing the use of operation-like test signals
Data Source
AI summary
An apparatus and a method for accurate determination of a transfer function of a device under test (DUT) comprising a measurement unit adapted to measure a transfer function of the device under test (DUT) across a frequency range in response to a wideband signal applied by the measurement unit to the device under test (DUT), a preprocessing unit adapted to cut out data of the measured transfer function at frequencies where the applied wideband signal comprises a low spectral power density and a data processing unit adapted to process the remaining data of the measured transfer function to determine an accurate transfer function of said device under test (DUT).