Multi-ADC Master-Slave Clocking for Noise-Resilient Synchronization
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Solution Overview
Problem
Existing systems with multiple analog-to-digital converter (ADC) circuits face challenges in maintaining synchronization due to noise and environmental perturbations, leading to misalignment of data output clocks, which complicates data capture and processing, especially in high-speed applications.
Innovation Solution
A master-slave configuration is implemented for ADC circuits, where the converter clock is subdivided into slower data ready clocks, allowing for continuous synchronization and resilient tolerance to noise, with digital and analog timing adjustments, and a tree-type structure for efficient propagation of reference clock signals to maintain phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ADC circuits operate independently to capture multiple analog signals simultaneously, then data capture capability is improved, but timing alignment between ADCs deteriorates due to noise and environmental perturbations
Solution Approach 1:
The system segments the clock distribution into hierarchical levels: a master clock source generates reference clocks that are distributed to multiple ADC circuits, each ADC generates its own data ready clock from the reference clock. This segmentation allows independent operation while maintaining synchronization through the reference relationship.
Solution Approach 2:
The system implements feedback through the reference clock distribution mechanism. Each ADC circuit's data ready clock is derived from the master reference clock, creating a feedback loop that continuously maintains timing alignment. When perturbations occur, the reference clock relationship provides automatic correction to maintain synchronization.
2Speed
If ADC circuits use fast clock signals for high-speed conversion, then conversion speed is improved, but susceptibility to noise and perturbations increases
Solution Approach 1:
The system performs preliminary synchronization by establishing the reference clock relationship before ADC conversion operations begin. The master clock source pre-configures the timing framework, and ADC circuits pre-synchronize their data ready clocks to this reference, ensuring they are ready for high-speed conversion with predetermined timing alignment.
Solution Approach 2:
The reference clock distribution mechanism provides beforehand cushioning against noise and perturbations. By establishing a master-reference relationship prior to conversion, the system creates a protective timing framework that cushions individual ADC circuits from the full impact of environmental noise, as deviations can be detected and corrected relative to the stable reference.
3Measurement precision
If additional synchronization circuitry is added to maintain timing alignment, then timing precision is improved, but system complexity increases
Solution Approach 1:
The master clock source serves multiple functions: it provides the reference timing signal for synchronization, establishes the hierarchical clock distribution structure, and enables both high-speed conversion and timing alignment simultaneously. This multi-functionality avoids the need for separate dedicated synchronization circuits.
Solution Approach 2:
Each ADC circuit generates its own data ready clock signal from the reference clock, making the synchronization self-service rather than requiring external control circuits. The ADC circuits autonomously maintain their timing alignment by deriving their clocks from the master reference, eliminating the need for additional complex synchronization hardware.
4Reliability
If data ready clocks are derived from a master reference clock, then synchronization is improved, but clock distribution complexity increases
Solution Approach 1:
The clock distribution is segmented into two simple stages: the master clock source distributes reference clocks to multiple ADC circuits, and each ADC circuit independently generates its own data ready clock from its received reference clock. This segmentation simplifies the distribution architecture compared to a fully centralized clock distribution system.
Data Source
AI summary
A system, apparatus and method for continuous synchronization of multiple ADC circuits is described. The ADC circuits can be arranged in a master-slave configuration within the system so that the converter clock is subdivided into slower speeds for the data output clock or for the control of de-multiplexing the outputs onto a wider bus, while maintaining ADC-to-ADC synchronization resilient to perturbations from noise and other upset sources. The configuration of the ADCs in the master-slave configuration can be varied according to overall system requirements in any one of a sequential configuration, a parallel configuration or a tree type of configuration, as well as others. Digital and/or analog timing adjustments can be made to each of the ADC circuits. The master clocking signals can be generated by a master clock generator circuit, which is either internally implemented in an ADC circuit, or externally implemented as a separate master clock generator circuit.