JESD204B Multi-Channel ADC Synchronization for Delay-Stable Sampling
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Solution Overview
Problem
Multi-channel phased array radars face challenges in ensuring synchronization between multiple channels due to increased sampling rates and data transmission rates, leading to delays and errors, which are exacerbated by temperature changes, and traditional parallel devices cannot meet engineering requirements for miniaturization and synchronization.
Innovation Solution
A multi-channel synchronous acquisition and transmission system using the JESD204B protocol, incorporating a multi-channel AD synchronous acquisition module, signal source, power module, and upper computer module, with features like FPGA, multi-channel ADC, independent clock source, and odelay resources to synchronize signals and correct for temperature-induced delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sampling rate and data transmission rate are increased to improve system performance, then the system capacity and processing capability are improved, but synchronization consistency between multiple channels deteriorates due to increased delays and errors
Solution Approach 1:
The patent introduces a sysref signal as an intermediary synchronization reference that mediates between multiple ADC clocks. This external reference signal coordinates the timing of all channels, ensuring that even at high sampling rates, the relative timing relationships are maintained through a common reference point, thus resolving the synchronization consistency issue.
Solution Approach 2:
The patent implements a feedback mechanism where the system monitors synchronization status across multiple channels and adjusts timing parameters accordingly. By continuously checking for delays and errors in real-time and making corrective adjustments, the system maintains synchronization consistency even when operating at increased sampling rates that would otherwise cause degradation.
2Adaptability or versatility
If traditional parallel devices are used to support multiple channels, then channel capacity is increased, but device complexity and pin count increase making miniaturization difficult
Solution Approach 1:
The patent transitions from a parallel architecture to a serial architecture based on the JESD204B protocol. By moving data transmission from multiple parallel pins to a single serial link with lane aggregation, the system achieves multi-channel capability through time-division multiplexing rather than spatial multiplexing, dramatically reducing pin count and enabling miniaturization while maintaining channel capacity.
Solution Approach 2:
The patent employs a universal serial interface that can handle multiple channels through a single connection type. The JESD204B protocol provides a multi-functional interface that can accommodate different channel configurations and data rates, replacing the need for channel-specific parallel connections and reducing overall device complexity.
3Temperature
If temperature changes occur during operation, then environmental adaptability is tested, but transmission delays and errors increase affecting synchronization accuracy
Solution Approach 1:
The patent performs preliminary calibration of timing parameters across all channels at different temperature conditions before actual operation. By pre-characterizing the system's temperature-dependent behavior and storing correction factors, the system can compensate for thermal effects during operation, maintaining synchronization accuracy despite temperature variations that would otherwise cause delay changes.
Data Source
AI summary
A multi-channel synchronous acquisition and transmission system based on the JESD204B protocol includes a multi-channel AD synchronous acquisition module, a signal source module, a power module and an upper computer module, wherein the signal source module sends a reference clock and multiple analog signals to the multi-channel AD synchronous acquisition module; the multi-channel AD synchronous acquisition module includes an FPGA, a multi-channel ADC, an independent clock source and multiple devices; the independent clock source receives the reference clock and transmits a sysref signal; a time window is configured in the multi-channel ADC; the FPGA generates a sync signal and synthesizes an LMFC, and an edge of the sysref signal is taken as an edge of the LMFC; in the multi-channel ADC, a corresponding ILAS is set for each digital signal; and the FPGA receives all the ILASs and digital signals, and multiple digital signals are processed synchronously.