Parallel Analog Combiner for High-Speed Adaptive Data Recovery
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Solution Overview
Problem
Existing analog adaptive filters used in high-speed data communications face limitations due to cascaded structures that lead to exponential bandwidth degradation, increased noise, and signal distortions, making them impractical for multi-GHz data speeds.
Innovation Solution
An adaptive analog parallel combiner circuit that sums outputs of filter taps in parallel, using all-pass filters and gain-controlled amplifiers to minimize performance degradations, allowing for individual transfer function formation at each tap and reducing parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cascade filter structure is used to achieve adaptive filtering, then adaptability is improved, but bandwidth degrades exponentially
Solution Approach 1:
The patent divides the filter into N independent parallel taps, where each tap processes the signal independently through its own all-pass filter and gain control. This segmentation eliminates the signal degradation that occurs when signals pass through multiple cascade stages, while still achieving adaptive filtering through the parallel combination of taps with different time constants.
2Adaptability or versatility
If number of cascade stages is increased to handle lossy channels, then adaptability is improved, but noise increases and linearity is lost
Solution Approach 1:
By segmenting the filter into parallel independent taps rather than cascading stages, each tap processes the signal with minimal degradation. The independent all-pass filters in each tap introduce minimal noise compared to multiple cascade stages, and the parallel structure preserves signal linearity while achieving the necessary adaptability for lossy channel compensation.
3Adaptability or versatility
If cascade structure is used, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the adaptive filter into N parallel independent taps, where each tap contains an all-pass filter and gain control. This segmentation simplifies the overall structure by eliminating the complex inter-stage coupling required in cascade filters, making each tap independently designable and可调, thereby reducing overall device complexity while maintaining adaptability.
Data Source
AI summary
An adaptive analog parallel combiner circuit for receiver data recovery from a communication signal is provided. The circuit includes a summer that sums outputs of a plurality of filter taps in parallel, including zeroth and first through Nth filter taps, each filter tap having as input the communication signal or a version thereof, wherein N is a finite integer greater than or equal to two. The zeroth filter tap has an amplifier with gain controlled by a zeroth adaptive gain control coefficient, and each of the first through Nth filter taps having an all pass filter and gain controlled amplification, with gain controlled by a corresponding one of a first through Nth adaptive gain control coefficients and the all pass filter implementing a transfer function having a zero and a pole equaling each other and at a base frequency divided by a corresponding integer from one through N.