Multi-Channel ADC Alignment Signals for Noise Reduction
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Solution Overview
Problem
Noise in the combined digital output of analogue-to-digital converter circuitry arises from misalignment between converter channels, particularly in high-speed applications where precise synchronization is critical.
Innovation Solution
The introduction of control circuitry that aligns the operation of multiple converter channels by transmitting alignment signals to synchronize the sampling and clock signals across sub-ADC units, ensuring that corresponding samples and digital values are generated in a coordinated manner, thereby minimizing noise and ensuring aligned operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple converter channels operate in parallel to increase conversion speed, then productivity is improved, but misalignment between channels occurs causing noise in the combined digital output
Solution Approach 1:
The patent implements a feedback mechanism where the first converter channel transmits alignment signals to the second converter channel based on the relationship between samples and their positions in the order. This feedback loop enables the second channel to adjust its operation to maintain synchronization, resolving the misalignment issue that arises from parallel operation
Solution Approach 2:
The patent applies preliminary action by having the first converter channel establish the sampling order and transmit alignment signals before the second channel processes its samples. This pre-coordination ensures that both channels are synchronized from the outset, preventing noise caused by misalignment while maintaining high conversion speed
2Measurement precision
If converter channels are synchronized to reduce noise, then measurement precision is improved, but device complexity increases due to additional control circuitry and alignment signals
Solution Approach 1:
The patent uses alignment signals as an intermediary mechanism between the two converter channels. These signals carry synchronization information from the first channel to the second channel, enabling precise coordination without requiring complex direct coupling or extensive control logic between the channels
Solution Approach 2:
The synchronization is established through preliminary transmission of alignment signals from the first converter channel before the second channel processes its samples. This pre-coordination approach simplifies the overall control architecture by setting up the synchronization relationship in advance rather than requiring continuous complex control during operation
Data Source
AI summary
The present invention relates to analogue-to-digital converter circuitry, and in particular to alignment between one set of analogue-to-digital circuitry and another set. Such sets may be referred to as converter channels.