Analog Feed-Forward Equalizer Using Parallel Charge-DAC Arithmetic
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Solution Overview
Problem
Conventional digital feed-forward equalizers suffer from high latency, increased power consumption, and area consumption due to sequential digital logic operations, which limit bandwidth and introduce signal-to-noise ratio degradation.
Innovation Solution
Analog-assisted feed-forward equalizers that utilize digital-to-analog converters to perform arithmetic operations in the analog domain, reducing latency and power consumption while maintaining low area usage by processing multiplication and addition operations concurrently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If digital feed-forward equalizers use sequential digital logic operations, then calculation accuracy is maintained, but latency increases and bandwidth is limited
Solution Approach 1:
The patent replaces sequential digital logic operations with parallel analog arithmetic operations. Specifically, analog multipliers and adders are used to perform equalization calculations in the analog domain, eliminating the sequential processing bottleneck of digital systems and enabling simultaneous computation of multiple equalization coefficients, thereby increasing bandwidth and reducing latency.
Solution Approach 2:
The patent transitions from time-sequential digital processing to spatial-parallel analog processing. By implementing multiple analog calculation paths that operate simultaneously, the system processes multiple data streams in parallel rather than sequentially, effectively adding a spatial dimension to the computation and achieving higher bandwidth without increasing latency.
2Use of energy by moving object
If digital feed-forward equalizers perform arithmetic operations digitally, then precision is maintained, but power consumption increases
Solution Approach 1:
The patent substitutes power-intensive digital arithmetic operations with lower-power analog arithmetic operations. Analog multipliers and adders consume significantly less power than their digital counterparts while maintaining sufficient precision for equalization applications, thus reducing overall power consumption without sacrificing calculation accuracy.
3Area of stationary object
If digital feed-forward equalizers use sequential processing, then implementation is straightforward, but area consumption increases
Solution Approach 1:
The patent merges multiple sequential digital processing stages into a single parallel analog processing stage. By combining multiplication and addition operations into simultaneous analog computations, the system reduces the total number of processing stages and associated hardware components, thereby decreasing area consumption while managing complexity through standardized analog circuit blocks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The analog-assisted feed-forward equalizers achieve reduced latency, area consumption, and power consumption, enabling efficient channel equalization with improved signal integrity and reduced inter-symbol interference.
Implementation Method 1
utilize digital-to-analog converters to perform arithmetic operations in the analog domain
Data Source
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AI summary
The techniques described herein relate to analog-assisted feed-forward equalizers. An example apparatus includes a first charge element digital-to-analog converter (DAC) including a first plurality of charge storage elements configured to store first samples of charge based on respective first portions of a digital input signal, and generate, based on the first samples, a first analog output signal proportional to the first portions. The apparatus further includes a second charge element DAC coupled to the first charge element DAC and including a second plurality of charge storage elements configured to store second samples of charge based on respective second portions of the digital input signal, and generate, based on the second samples, a second analog output signal proportional to the second portions, and wherein the coupling of the first and second outputs generates a third analog output signal based on a combination of the first and second analog output signals.