Reference Noise Compensation for Single-Ended Serial Links
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Solution Overview
Problem
High-speed single-ended signaling in data links faces significant noise issues due to relative noise between transmitter and receiver grounds, which degrades signal integrity, particularly at high speeds, and existing technologies are inefficient in addressing these challenges.
Innovation Solution
A system and method for reference noise compensation, where the transmitter circuit transmits a single-ended DC-balanced signal, and the receiver circuit samples and combines reference noise with the received signal to restore the original signal, using a separate reference signal or a DC-balanced signal to generate a compensation signal that removes noise from the data signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If single-ended signaling is used to reduce area and power consumption, then area efficiency and power efficiency are improved, but signal integrity deteriorates due to noise from relative ground differences between transmitter and receiver
Solution Approach 1:
A reference signal is introduced as an intermediary carrier to transport ground noise information from the transmitter to the receiver. The receiver uses this reference signal to extract and compensate for ground noise, thereby maintaining signal integrity while using single-ended signaling. This mediator approach allows the system to achieve both power efficiency and signal integrity.
2Use of energy by moving object
If single-ended signaling is used to reduce area and power consumption, then area efficiency and power efficiency are improved, but signal integrity deteriorates due to noise from relative ground differences between transmitter and receiver
Solution Approach 1:
The reference signal serves as a mediator that carries ground noise information from the transmitter environment to the receiver. By sampling this reference signal, the receiver can extract the ground noise component and subtract it from the data signal, effectively removing the harmful noise while maintaining the power-efficient single-ended signaling approach.
3Reliability
If differential signaling is used to improve signal integrity and noise tolerance, then signal integrity is improved, but area consumption and power consumption increase due to requiring two physical signals for each data signal
Solution Approach 1:
The harmful ground noise is extracted from the data signal path by using a separate reference signal. The receiver samples the reference signal to isolate ground noise, then subtracts this extracted noise from the received data signal. This allows single-ended signaling to achieve noise immunity comparable to differential signaling without the penalty of requiring two physical signals per data channel.
4Reliability
If differential signaling is used to improve signal integrity and noise tolerance, then signal integrity is improved, but area consumption and power consumption increase due to requiring two physical signals for each data signal
Solution Approach 1:
Ground noise is extracted from the data signal using a dedicated reference signal path. The receiver samples the reference signal to obtain ground noise information, then removes this noise component from the data signal. This extraction approach enables single-ended signaling to achieve the noise immunity of differential signaling while using only one physical signal per data channel, thus reducing area consumption.
Data Source
AI summary
A single-ended signal transmission system recovers a noise signal associated with a data input signal and uses the recovered noise signal to compensate for noise on the data input signal. The noise signal may be recovered from a noise reference signal line, or clock signal line, or a data signal line associated with a DC-balanced data input signal. The recovered noise signal may be represented as an analog signal or a digital signal. The recovered noise signal may be processed to compensate for DC offset and nonlinearities associated with one or more different input buffers. In one embodiment, the recovered noise signal includes frequency content substantially below a fundamental frequency for data transmission through the data input signal.