Multi-ADC Spectrum Analyzer Routing for Wideband RF Accuracy
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Solution Overview
Problem
Existing spectrum analyzers face challenges in accurately analyzing multiple input signals with different frequencies and bandwidths due to suboptimal performance of single multi-channel ADCs, leading to inefficiencies in RF signal testing and analysis, particularly at and above 6 GHz.
Innovation Solution
A multi-channel spectrum analyzer with a field programmable gate array (FPGA) manages a multi-channel ADC subsystem that selects suitable ADCs based on input signal characteristics, adjusting the ADC sample clock for optimal performance across varying frequencies and bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single multi-channel ADC is used to convert multiple input signals with different frequencies and bandwidths, then device complexity is reduced, but measurement precision deteriorates due to suboptimal performance for specific signal characteristics
Solution Approach 1:
The patent divides the ADC subsystem into multiple independent ADC channels, each optimized for specific frequency ranges and bandwidths. Instead of using a single multi-channel ADC that must compromise performance across all signals, the system segments the conversion function across multiple specialized ADCs, allowing each to excel at its designated signal type while maintaining overall system manageability.
2Measurement precision
If ADC characteristics are optimized for specific signal types, then measurement precision improves, but device complexity increases due to multiple ADC channels
Solution Approach 1:
The patent implements dynamic signal routing that automatically directs different input signals to the most appropriate ADC channel based on real-time signal characteristics such as frequency and bandwidth. This dynamic allocation allows the system to maintain high measurement precision for each signal type while managing complexity through intelligent control rather than static, overly complex hardware architecture.
3Ease of operation
If a single ADC is used for all channels, then ease of operation is improved, but measurement precision deteriorates for signals with specific frequency and bandwidth characteristics
Solution Approach 1:
The patent implements automatic signal routing and ADC selection that eliminates the need for manual configuration by operators. The system autonomously analyzes incoming signal characteristics and directs them to the optimal ADC channel, maintaining ease of operation while achieving high measurement precision. The self-service capability handles the complexity of multi-ADC coordination without requiring user intervention.
Data Source
AI summary
A multi-channel analog-digital converter (ADC) subsystem for test device such as a spectrum analyzer may include multiple multi-channel ADCs to receive down-converted signals and convert the received signals to digital output signals, a field programmable gate array (FPGA) to select one or more ADCs based on a frequency, a bandwidth, and/or a signal type of each received signal and a characteristic of each ADC, and an ADC sample clock to provide a clock signal to the selected ADCs. Characteristics of the ADCs may include a resolution, a signal-to-noise-and-distortion ratio (SINAD), an effective number of bits (ENOB), a signal-to-noise ratio (SNR), a total harmonic distortion (THD), a total harmonic distortion plus noise (THD+N), and/or a spurious free dynamic range (SFDR).