Data Converter Chain Synchronization for High-Frequency Clock Alignment
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Solution Overview
Problem
Synchronizing high-frequency data converters in systems like antenna arrays or I/Q modulation systems is challenging due to the difficulty in precisely distributing synchronizing signals at frequencies above 100 megahertz, leading to system complexity and performance degradation.
Innovation Solution
A method where data converters form a series chain, with a synchronizing signal transmitted sequentially and parameterized to account for propagation delays, allowing each converter to resynchronize and align with the correct reference clock front, reducing design complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronizing signals are distributed in phase to all converters using carefully designed pathways, then synchronization precision can be achieved, but system complexity and manufacturing cost increase significantly
Solution Approach 1:
The system segments the synchronization approach by dividing converters into groups and using a master converter that other converters synchronize to, rather than requiring all converters to be synchronized directly to the reference clock through carefully designed pathways
Solution Approach 2:
The master converter performs self-synchronization to the reference clock and automatically generates synchronizing signals for other converters, eliminating the need for external pathway design and manual synchronization configuration
2Measurement precision
If synchronizing signals are distributed with precisely evaluated propagation delays, then synchronization precision can be achieved, but manufacturing cost and design difficulty increase
Solution Approach 1:
The master converter automatically measures and compensates for propagation delays in real-time through its synchronization algorithm, eliminating the need for manual evaluation and compensation of delays during manufacturing and design stages
Solution Approach 2:
The system dynamically adjusts synchronization parameters including timing offsets and phase corrections based on measured propagation characteristics, allowing the master converter to adapt to actual system conditions rather than relying on fixed design values
3Ease of operation
If PLL solutions are used for synchronization, then converters can be synchronized without synchronizing signals, but jitter is introduced in the sampling clocks
Solution Approach 1:
A digital synchronizing signal acts as an intermediary between the reference clock and the converters, providing precise timing information without requiring PLL circuits that introduce jitter
Solution Approach 2:
The patent replaces the mechanical/analogue PLL synchronization mechanism with a digital synchronizing signal approach, eliminating the inherent jitter of PLL circuits while maintaining synchronization capability
4Ease of operation
If PLL solutions are used for synchronization, then converter synchronization is achieved, but temperature stability deteriorates
Solution Approach 1:
The patent replaces temperature-sensitive PLL circuits with digital logic-based synchronization that is inherently more stable across temperature variations
Solution Approach 2:
The master converter continuously monitors and maintains synchronization timing independently of temperature variations, providing stable synchronizing signals to all converters regardless of environmental conditions
5Productivity
If synchronizing signals are used at frequencies above 100 megahertz, then rapid converter synchronization is achieved, but signal distribution becomes difficult and expensive
Solution Approach 1:
The high-frequency reference clock is segmented such that only the master converter directly receives it, while other converters receive lower-frequency synchronizing signals derived from the master, reducing the burden on signal distribution pathways
Solution Approach 2:
The master converter acts as an intermediary that converts the high-frequency reference clock into lower-frequency synchronizing signals for distribution to other converters, reducing the complexity and cost of high-frequency signal distribution
Data Source
AI summary
In an architecture for processing data comprising a control unit and converters CNj to be synchronized to an active front of a common reference clock CLK, the synchronizing method makes provision for the converters to be arranged in at least one series chain, and for a procedure for synchronizing the converters by propagating a synchronizing signal SYNC-m emitted by the control unit, said signal being retransmitted as output OUT by each converter, after resynchronization to a clock active front, to a synchronization input IN of a following converter in the chain. Each converter comprises a synchronization configuration register REG containing at least one polarity parameter Sel-edgej that sets the polarity of the reference-clock front for reliable detection of a synchronizing signal received via the input of the converter. A phase parameter Sel-shiftj furthermore allows the phase of the sampling clocks of n converting cores of the converters, working at a sampling frequency obtained by dividing by n the CLK reference-clock frequency, to be synchronized.