Active Copper Cable Redriver Chip for High-Frequency Loss Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing active copper cable technologies face challenges in maintaining high bandwidth and high transmission rates due to high-frequency attenuation, leading to reduced signal amplitude and increased inter-symbol interference, which complicates module design and reduces transmission performance.
Innovation Solution
A redriver chip is introduced, featuring an input signal detection module, an amplitude gain control module, and an equalization control module. The chip amplifies the signal amplitude and compensates for high-frequency loss by performing amplitude control and equalization in specific frequency ranges, ensuring equal amplification from low-frequency to high-frequency parts of the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If de-emphasis processing is performed at the transmitter end to overcome inter-symbol interference, then the transmitted signal swing is compressed, but the received signal swing becomes too small resulting in small eye height and insufficient noise margin
Solution Approach 1:
The patent divides the frequency compensation into two distinct segments: a first frequency range for high-frequency loss compensation and a second frequency range for additional high-frequency gain. This segmentation allows each segment to be optimized independently, with the first segment addressing basic high-frequency attenuation and the second segment providing enhanced gain specifically for the high-frequency portion of the signal, thereby increasing received signal swing without causing excessive inter-symbol interference
Solution Approach 2:
The patent applies different gain characteristics to different frequency ranges. The first frequency range receives a first adjustable gain, while the second frequency range receives a second adjustable gain that is specifically applied to the high-frequency part of the signal. This local quality approach ensures that high-frequency components are amplified more than low-frequency components, increasing the received signal swing and eye height while maintaining signal integrity
2Length of stationary object
If high-frequency loss compensation is performed, then the signal transmission distance is extended, but the signal amplitude is reduced leading to small eye height
Solution Approach 1:
The patent applies preliminary high-frequency gain in the first frequency range before the signal undergoes further transmission. By pre-amplifying the high-frequency components and then applying additional high-frequency gain in the second frequency range, the system compensates for high-frequency loss that will occur during transmission, enabling extended transmission distance while maintaining adequate signal amplitude and eye height at the receiver
Solution Approach 2:
The patent dynamically adjusts the gain parameters in different frequency ranges. The first adjustable gain and second adjustable gain can be modified based on transmission distance, cable characteristics, and signal quality requirements. This parameter flexibility allows the system to optimize for either extended distance or maximum signal amplitude depending on the specific application requirements
3Device complexity
If conventional active copper cable schemes are used, then the module design complexity is reduced, but the receiving eye height is small and the transmission performance is insufficient
Solution Approach 1:
The patent implements a multi-functional redriver chip that performs both high-frequency loss compensation and signal amplitude enhancement within a single device. The chip simultaneously processes two different frequency ranges with different gain characteristics, providing both basic equalization and enhanced high-frequency gain. This universal approach maintains relatively simple module design while achieving superior transmission performance with larger eye height compared to conventional single-function active copper cable schemes
Data Source
AI summary
A redriver chip for an active copper cable is provided includes: an input signal detection module, configured for detecting a signal amplitude of an input signal; an amplitude gain control module, configured for: performing amplitude control based on a first adjustable gain so as to obtain an intermediate signal; an equalization control module, configured for: performing gain control based on a second adjustable gain, to a gain of a high-frequency part of the intermediate signal relative to a low-frequency part, so as to obtain an output signal. The chip is configured for: amplifying in equal proportions a low-frequency part of the output signal relative to a low-frequency part of the input signal and a high-frequency part of the output signal relative to a high-frequency part of the input signal.