Hybrid Multimode Network Analyzer for Fast RF Characterization
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Solution Overview
Problem
Current network analyzers, such as VNAs, are limited in characterizing devices quickly due to the need for sweeping test signals over a frequency range, which restricts the speed of measurement, despite providing high dynamic range and precision.
Innovation Solution
A hybrid network analyzer with multiple modes, including a band-limited multi-tone signal mode, a tunable single-tone signal mode, and a broadband multi-tone signal mode, allows for adaptable test signals and local oscillator configurations to convert signals into intermediate frequencies for analysis, enabling faster and more dynamic characterization of devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tunable single-tone test signal is swept across the DUT test bandwidth, then high dynamic range and measurement precision are achieved, but the characterization speed is limited
Solution Approach 1:
The patent segments the test signal into multiple discrete tones within a band-limited multi-tone signal. Instead of using a single swept tone, the system applies multiple tones simultaneously across the test bandwidth, allowing parallel measurement of multiple frequency points and significantly increasing characterization speed while maintaining measurement precision through selective tone analysis
Solution Approach 2:
The patent employs periodic sweeping of the band-limited multi-tone signal across the test bandwidth. The center frequency of the multi-tone signal is swept periodically, and measurements are taken at each position. This periodic action combines the precision of swept measurements with the speed benefits of multi-tone excitation, as multiple frequency points are measured during each sweep cycle
2Productivity
If a broadband multi-tone test signal is used, then characterization speed is greatly increased, but dynamic range and measurement precision are reduced
Solution Approach 1:
The patent segments the broadband test bandwidth into multiple band-limited multi-tone signals, each covering a narrower frequency range. By dividing the broadband signal into manageable bands and sweeping them sequentially, the system maintains the speed advantage of multi-tone excitation while preserving the dynamic range and precision benefits of narrower bandwidth measurements
Solution Approach 2:
The patent uses periodic sweeping of the band-limited multi-tone signal across the entire test bandwidth. The center frequency is swept through the band, and measurements are taken at multiple positions during each sweep. This periodic measurement approach allows the system to achieve comprehensive broadband characterization while maintaining measurement precision through repeated measurements at each frequency position
3Measurement precision
If a tunable LO signal tracking the center frequency is used, then precise IF conversion is achieved for band-limited multi-tone signals, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the LO signal automatically tracks the center frequency of the band-limited multi-tone test signal. The LO frequency is adjusted based on the current center frequency position during the sweep, ensuring that the difference frequency always falls within the desired IF range. This feedback-based tracking simplifies the system by eliminating the need for complex manual frequency coordination while maintaining precise IF conversion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid network analyzer provides a balance between dynamic range and speed, allowing for faster characterization of devices compared to traditional VNAs while maintaining high precision, and can be adapted to specific applications through mode selection.
Implementation Method 1
a receiver configured to convert into an intermediate frequency (IF) signal using the tunable LO signal one or both of the band-limited multi-tone test signal and a response signal
Data Source
AI summary
Network analysis employs a band-limited multi-tone test signal having a tunable center frequency to test a device under test (DUT). A hybrid network analyzer includes a test signal source to provide the band-limited multi-tone test signal, and a local oscillator (LO) source to provide a tunable LO signal configured to track the tunable center frequency of the band-limited multi-tone test signal. The hybrid network analyzer further includes a receiver to convert into an intermediate frequency (IF) signal using the tunable LO signal one or both of the band-limited multi-tone test signal and a response signal from a device under test (DUT) produced in response to the band-limited multi-tone test signal. The test signal source is further configured to provide a tunable single-tone test signal and a broadband multi-tone test signal to test the DUT in various modes.