Vector Network Analyzer Phase Regulation via Frequency Correction
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Solution Overview
Problem
Existing vectorial network analyzers face challenges in generating excitation signals with a fixed, non-fluctuating phase difference, which is essential for accurate differential mode measurements, due to the high cost of vectorial modulators and phase control complexity.
Innovation Solution
A measuring device with separate signal generators for each port, equipped with a phase-measuring device and a control unit that adjusts frequencies to maintain a specified phase offset between excitation signals, eliminating the need for expensive vectorial modulators by measuring and correcting phase offsets at internal positions and calibrating for reference positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vectorial modulators are used to equalize phase differences, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the operating frequency of signal generators dynamically to correct phase differences. Instead of using complex vectorial modulators, the system adjusts the frequency parameter of standard signal generators to achieve the desired phase relationship, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The patent uses a calibration table that stores pre-determined frequency offset values corresponding to different phase differences. This copying approach allows the system to replicate the effect of expensive vectorial modulators by looking up and applying pre-calculated frequency adjustments, eliminating the need for costly hardware while maintaining phase accuracy
2Device complexity
If separate signal generators are used for each port, then device complexity is reduced, but measurement precision deteriorates due to frequency drift
Solution Approach 1:
The patent implements a feedback mechanism where the actual phase difference is continuously measured and compared against the desired phase difference. Based on this comparison, the control unit automatically adjusts the frequency of the signal generators to correct any deviations, ensuring long-term phase stability without requiring complex hardware
Solution Approach 2:
The patent makes the signal generator frequencies dynamic rather than fixed. The frequencies are continuously adjusted based on real-time phase measurements and control signals, allowing the system to adapt to frequency drift and maintain precise phase relationships despite using simpler separate signal generators
Data Source
AI summary
A method for operating a measuring device, in particular, a vectorial network analyzer, which can be connected via at least two ports to a device under test, with excitation units assigned to each port, wherein each excitation unit provides a signal generator, with which the assigned port can be supplied with an excitation signal, provides the following procedural stages: a measurement at measuring positions of the actual phase offset between the excitation signals output at the ports; and a variation of the frequency of at least one of the two signal generators during a correction interval so that a specified set phase offset is achieved at reference positions between the excitation signals output at the ports.