Calibration Apparatus Using Pulse Spectrum Analysis for Signal Path Delay
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Solution Overview
Problem
Calibrating measuring apparatuses for devices under test with varied terminal shapes and signal paths is challenging, as existing methods cannot effectively correct multiple parameters using a single reference signal, particularly for analog systems, and introduce measurement errors due to signal path issues.
Innovation Solution
A method and apparatus that utilize a resistance load connected to the device under test, transmitting and analyzing reference signals to correct frequency and timing properties by monitoring and spectrum-analyzing the signals, allowing for the calculation of signal transmission path properties to eliminate measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are applied close to the terminal of the device under test to eliminate measurement errors, then measurement precision is improved, but device complexity and ease of operation deteriorate due to the need for switches and special terminal configurations
Solution Approach 1:
The patent introduces a resistance load as an intermediary element connected to the device under test. This resistance load serves as a known impedance reference that enables the calculation of signal transmission path properties without requiring direct connection of reference signals to the device terminal. The resistance load acts as a mediator that simplifies the calibration process while maintaining measurement precision.
Solution Approach 2:
The patent replaces the mechanical switch-based reference signal application method with an electrical measurement approach using resistance loads and spectrum analysis. Instead of physically connecting reference signals near the terminal using switches, the system uses electrical measurements of reflected signals combined with mathematical calculations to achieve the same calibration objective, thereby reducing mechanical complexity.
2Measurement precision
If TDR method is used for timing calibration, then timing errors are eliminated, but adaptability deteriorates as it can only be used for digital signal systems and not analog systems
Solution Approach 1:
The patent creates a universal calibration method that can be applied to both digital and analog signal systems. By using resistance loads and spectrum analysis of reflected signals, the system can calibrate multiple parameters (frequency, phase, timing) across different signal types. This multi-functional approach eliminates the need for separate calibration methods for different system types, thereby improving adaptability while maintaining timing accuracy.
Solution Approach 2:
The patent changes the calibration approach from time-domain TDR measurements to frequency-domain spectrum analysis. By transforming the measurement domain and using resistance load impedance calculations, the system can extract timing and frequency information from spectral data, making the calibration method applicable to both digital and analog systems without losing timing precision.
3Measurement precision
If multiple calibration parameters are calibrated separately, then measurement precision is improved, but productivity deteriorates due to multiple calibration steps
Solution Approach 1:
The patent merges multiple calibration parameters (frequency, phase, timing) into a single calibration process. By using one resistance load connection and spectrum analysis of reflected signals, the system simultaneously extracts multiple parameters that would otherwise require separate calibration steps. This consolidation improves productivity while maintaining the precision of individual parameter measurements.
Solution Approach 2:
The patent creates a universal calibration procedure that handles multiple parameters through a single process flow. The resistance load and spectrum analysis approach serves multiple calibration functions simultaneously, eliminating the need for separate calibration routines for each parameter and thereby improving overall calibration efficiency without sacrificing measurement precision.
Data Source
AI summary
In a device for measuring the properties of a device under test connected by a signal transmission path having reciprocity, a terminal on the device under test side of the signal transmission path is opened; pulse signals are transmitted to a terminal on the measuring apparatus side of the signal transmission path; the transmitted pulse signals are monitored and spectrum analyzed on the measuring apparatus; the pulse signals reflected from a terminal on the device under test side of the signal transmission path are monitored and spectrum analyzed on the measuring apparatus; and the frequency properties of propagation delay of the signal transmission path are found by referring to the coefficient obtained based on the impedance of the resistance load, the spectrum of the transmitted pulse signals, and the spectrum of the reflected pulse signals. The effect of an error is eliminated from the measuring results using the resulting frequency properties or propagation delay in actual measurement.