Asymmetric A/D Converter Scheduling for Fiber-Optic Transceivers
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Solution Overview
Problem
Optical transceivers face challenges in efficiently converting multiple analog signals with asymmetric sampling rate requirements using a single analog-to-digital converter, leading to under-sampling of fast signals and over-sampling of slow signals, which increases component costs and power consumption, and introduces electrical noise.
Innovation Solution
A scheduling lookup table is created based on the required sampling rates of operational parameters to optimize the conversion of multiple analog signals, allowing for efficient scheduling of sampling rates for each signal using a single A/D converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single A/D converter is used to convert multiple analog signals with different sampling rates, then component cost is reduced, but sampling accuracy deteriorates due to under-sampling of fast signals and over-sampling of slow signals
Solution Approach 1:
The patent implements dynamic scheduling of the single A/D converter to adaptively allocate conversion resources based on the sampling rate requirements of different analog signals. The controller dynamically adjusts the timing and allocation of A/D conversions to ensure each signal receives appropriate sampling frequency, resolving the contradiction between using a single converter (cost reduction) and maintaining accurate sampling for signals with different rate requirements
Solution Approach 2:
The system changes the operational parameters of the single A/D converter by varying its sampling timing and allocation based on the characteristics of incoming analog signals. By modifying the scheduling parameters dynamically, the system achieves accurate sampling for multiple signals with different rate requirements while using only one converter, thus improving measurement precision without increasing component cost
2Device complexity
If a single A/D converter is used for multiple analog signals, then component cost is reduced, but power consumption increases due to electrical noise
Solution Approach 1:
The patent employs periodic scheduling of the A/D converter based on the sampling rate requirements of different signals. By organizing conversions in periodic cycles rather than continuous operation, the system reduces overall power consumption while maintaining accurate sampling. The controller allocates time slots periodically to different signals, ensuring the A/D converter operates efficiently without excessive electrical noise or energy waste
3Measurement precision
If asymmetric sampling rates are used for different analog signals, then measurement precision is improved for each signal, but device complexity increases due to scheduling challenges
Solution Approach 1:
The controller implements feedback mechanisms to monitor the sampling rate requirements of different analog signals and adjusts the scheduling accordingly. By continuously feedback the status of each signal and its sampling needs, the system maintains precise asymmetric sampling rates while managing the scheduling complexity through intelligent control algorithms that allocate resources efficiently
Data Source
AI summary
A firmware control method for the optimized use of a single A/D converter to measure multiple analog signals with asymmetric requirements on sampling rate including a lookup table design procedure and an acquisition algorithm. Since diagnostic analog parameter values require differing sampling rates to be effectively measured, the schedule for converting those values to digital value should correspond to the associated sampling rate. The present invention involves the creation and subsequent implementation of a scheduling table based on the required sampling rates of the operational parameters to be converted.