Multi-Channel Frequency Domain Test Instrument with Tunable Downconverters
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Solution Overview
Problem
Current frequency domain test and measurement instruments typically have a single channel, making it difficult to compare and analyze frequency spectra, especially when dealing with signals from different frequency ranges, such as baseband digital data and modulated RF carriers, due to limitations in bandwidth and signal processing capabilities.
Innovation Solution
A multi-channel test and measurement instrument with downconverters that can shift and process multiple frequency domain signals simultaneously, allowing for the analysis of signals with different frequency spectra from various sources, featuring tunable downconverters, user interfaces for controlling frequency domain parameters, and storage of data in memory for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single channel is used in frequency domain test and measurement instruments, then the device complexity is reduced, but the ability to compare and analyze multiple frequency spectra simultaneously is lost
Solution Approach 1:
The instrument is divided into multiple independent frequency domain channels, each capable of analyzing a specific frequency spectrum. This segmentation allows simultaneous analysis of multiple frequency ranges (e.g., baseband and RF) without requiring a single complex channel to handle all frequencies, thus improving versatility while keeping individual channel complexity manageable.
Solution Approach 2:
Each frequency domain channel is designed with universal functionality to handle different signal types and frequency ranges. The channels can be configured to analyze various modulated signals, making the instrument adaptable to multiple measurement scenarios without requiring separate specialized devices for each frequency range.
2Adaptability or versatility
If bandwidths of filters, mixers, transmitters, or antennae are increased to handle multiple frequency ranges, then the ability to process different frequency spectra is improved, but the bandwidth limitations and signal processing complexity increase
Solution Approach 1:
Instead of using a single wide-bandwidth signal processing chain that would be complex and difficult to optimize, the system segments the frequency spectrum into multiple channels, each with its own dedicated filters, mixers, and signal processing components. This allows each channel to be optimized for its specific frequency range, reducing overall signal processing complexity while maintaining the ability to handle multiple frequency spectra.
3Measurement precision
If a single channel analyzes one frequency spectrum at a time, then the measurement precision for that specific frequency is improved, but the ability to perform time-correlated analysis of multiple frequencies is lost
Solution Approach 1:
The system segments the analysis function into multiple parallel channels, where each channel maintains high measurement precision for its assigned frequency spectrum while operating simultaneously. This parallel segmented architecture enables time-correlated analysis because multiple channels can capture and process frequency spectra at the same time instances, allowing comparison and correlation of time-varying signals across different frequency ranges.
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
Enables the simultaneous analysis of multiple frequency domain signals with different spectra, allowing for precise comparison and analysis of time-correlated frequency spectra, improving the ability to analyze and interpret signals across various frequency ranges.
Implementation Method 1
an acquisition system including multiple downconverters. Each downconverter is configured to shift a frequency range of an input signal received through a corresponding port to an intermediate frequency (IF) range
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A test and measurement instrument (10) including a plurality of input ports (18); an acquisition system (12) coupled to the input ports and configured to acquire frequency domain data from the input ports; a user interface (16) configured to present frequency domain controls (54,71,73,94-97,106,108) for at least two of the input ports; and a controller (14) configured to adjust frequency domain acquisition parameters of the acquisition system in response to the frequency domain controls such that frequency domain acquisition parameters associated with a first input port can be different from frequency domain acquisition parameters associated with a second input port.