VNA Time-Frequency Indexed Pulse Calibration
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Solution Overview
Problem
Conventional vector network analyzer (VNA) calibration methods fail to accurately account for instrument-related stimulus pulsing effects, leading to inaccurate measurements of device under test (DUT) responses due to modulation defects and time-dependent error coefficients.
Innovation Solution
A method that calibrates the VNA to generate corrections for deterministic setup defects by mapping error terms based on both time and frequency indices, allowing for time alignment of corrections to remove stimulus modulation defects from measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional VNA calibration methods are used, then the calibration process is simple and fast, but measurement accuracy deteriorates due to unaccounted stimulus pulsing effects
Solution Approach 1:
The calibration process is segmented into multiple distinct phases: traditional VNA calibration to establish baseline error terms, followed by separate pulse modulator characterization to identify stimulus pulsing defects, and finally integration of both correction models. This segmentation allows each calibration component to be optimized independently while achieving comprehensive measurement accuracy.
Solution Approach 2:
The invention extends the traditional frequency-domain calibration approach by adding a temporal dimension. Error terms are now characterized as functions of both frequency and time, allowing the system to account for time-varying stimulus pulsing effects that conventional single-frequency calibration cannot capture.
2Adaptability or versatility
If pulse modulator is used for RF pulse measurements, then the ability to measure DUT response to pulse stimulus is enabled, but measurement accuracy deteriorates due to stimulus modulation defects
Solution Approach 1:
The system incorporates feedback by measuring the actual pulse modulator output and using this information to correct subsequent measurements. The pulse modulator defects are characterized through measurement, and this characterization feeds into the correction algorithm that processes DUT measurement data, creating a closed-loop system that compensates for modulator imperfections.
Solution Approach 2:
The invention introduces an intermediary correction process between the pulse modulator and the measurement analysis. Error terms act as intermediaries that capture the modulator's defects and translate them into correctable parameters, allowing the separation of modulator defects from actual DUT response characteristics.
3Measurement precision
If measurement time resolution is increased to detect stimulus pulsing effects, then measurement accuracy improves, but measurement time increases
Solution Approach 1:
The system performs preliminary characterization of the pulse modulator defects during a separate calibration phase before actual DUT measurements are taken. This preliminary action captures all stimulus pulsing effects in advance, allowing rapid correction of subsequent measurements without requiring extended measurement times for each DUT characterization.
Data Source
AI summary
A method for measuring scattering parameters in a device under test (DUT) using a vector network analyzer (VNA), includes calibrating the VNA to generate corrections for deterministic setup defects and mapping a plurality of error terms based on a plurality of time indices, wherein each time indicia is associated with an error term. A test signal is transmitted to the DUT to obtain a measurement signal from the DUT in response to the test signal. The generated corrections to obtained measurements are time aligned based on the mapped error terms.