Deembedding Unit for High-Frequency Signal Measurement Error Compensation
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Solution Overview
Problem
Measuring devices face challenges in accurately analyzing high-frequency signals in real-time due to measurement errors caused by parasitic effects and wave resistance mismatches, which complicate signal compensation and trigger timing.
Innovation Solution
A measuring device with a deembedding unit, comprising an adaptive filter and filter cascade, including equalizing and echo-compensation filters, is used to correct measurement errors in real-time time-domain measurements by compensating parasitic effects and wave resistance errors, allowing for accurate signal analysis and trigger timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration unit with pre-distortion is used to compensate measurement errors, then measurement precision is improved, but device complexity and volume increase significantly
Solution Approach 1:
The patent extracts the deembedding function from a separate external calibration unit and integrates it directly into the measuring device's signal processing path. This allows the measurement error compensation to be performed within the existing device architecture, eliminating the need for a bulky external calibration unit while maintaining measurement precision.
Solution Approach 2:
The patent introduces a deembedding unit as an intermediary component between the analog-digital converter and the processing unit. This intermediary performs the mathematical operations to compensate for measurement errors introduced by the probe and measurement cable, effectively separating the compensation function from the main measuring device structure.
2Measurement precision
If convolution operations are used to compensate measurement errors in time domain, then measurement precision is improved, but computational effort and processing time increase excessively
Solution Approach 1:
The patent changes the mathematical approach from time-domain convolution operations to frequency-domain multiplication operations. By transforming the measurement signal and the embedding characteristics into the frequency domain, the compensation operation becomes a simple multiplication rather than a computationally intensive convolution, enabling real-time processing of broadband high-frequency signals.
3Measurement precision
If a probe with large calibration unit is used to compensate measurement errors, then measurement precision is improved, but adaptability to different devices under test decreases
Solution Approach 1:
The patent implements a dynamic deembedding unit that can be adapted to different devices under test and measurement configurations. The deembedding characteristics can be adjusted and reconfigured based on the specific probe, measurement cable, and device under test being used, providing both measurement precision and adaptability without requiring physical modification of the probe.
Data Source
AI summary
The invention relates to a measuring device for measuring a high-frequency signal and a method for correcting a high-frequency signal superposed with measurement errors by means of the measuring device. The measurement is a time-domain measurement in real-time. The measuring device provides a measurement-signal input, an analog digital converter and a processing unit, wherein the measurement-signal input is connected to a device under test in order to measure the high-frequency signal. According to the invention a deembedding unit is arranged in the signal path of the measuring device between analog-digital converter and the processing unit in order to compensate measurement errors resulting from the connection of devices under test and measuring devices.