Canceller Device for Echo and Crosstalk in Interleaved ADCs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-speed data transmission systems, interleaved A/D converters face challenges in canceling echo and cross-talk while maintaining circuit scale and power consumption, especially with sampling phase shifts affecting accuracy and complexity.
Innovation Solution
A canceller device comprising a first canceller for compensating sampling phase shifts and a second canceller for echo and cross-talk cancellation, with a compensation range selection circuit determining the necessary compensation range based on tap coefficients, allowing for efficient echo and cross-talk removal without increasing circuit scale or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a single canceller is used for both phase shift compensation and echo/cross-talk cancellation, then circuit scale and power consumption are reduced, but cancellation accuracy deteriorates due to functional mixing
Solution Approach 1:
The canceller is divided into two functional segments: a phase shift compensator that corrects sampling phase shifts, and an echo/cross-talk canceller that removes interference signals. This segmentation allows each component to specialize in its function, maintaining high cancellation accuracy while the integrated design keeps overall circuit scale and power consumption reduced.
2Measurement precision
If sampling phase shift compensation is performed accurately, then cancellation accuracy improves, but device complexity increases due to additional processing requirements
Solution Approach 1:
The phase shift compensator performs preliminary correction of sampling phase shifts before the echo/cross-talk canceller processes the signal. By addressing phase shifts first, the subsequent cancellation operation works with already-aligned signals, achieving high accuracy without requiring complex joint optimization algorithms.
Solution Approach 2:
The phase shift compensator dynamically adjusts tap coefficients based on detected phase shifts, allowing the system to adapt to varying timing conditions. This dynamic adaptation enables accurate compensation across different operating conditions without requiring a completely different circuit architecture.
3Productivity
If high-speed operation is maintained, then productivity is improved, but timing design difficulty increases due to sampling phase shifts
Solution Approach 1:
The phase shift compensator acts as an intermediary component that mediates between the high-speed sampling process and the cancellation operation. It absorbs the timing alignment requirements, allowing the main cancellation logic to operate at full speed without complex timing coordination.
Data Source
AI summary
Disclosed is a canceller device comprising a subcanceller for compensating the sampling phase shift of a plurality of analog-to-digital convert circuits for receiving a common input analog signal, converting the analog signal into digital signals responsive to respective sampling clock signals with different phases to each other, and for outputting the digital signals, a main canceller for canceling echo/cross-talk from the signal output from analog-to-digital convert circuits whose the sampling phase shifts have been compensated, and a compensation range selection circuit for determining the range of the sampling phase shift for being compensated by the subcanceller based on the tap coefficients of the main canceller.