Serial Link Receiver Eye Monitoring with Nonlinear Preamp Mapping
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Solution Overview
Problem
High-speed data communication systems face challenges in accurately recovering data from incoming data streams due to increasing bandwidth requirements and the resulting nonlinear characteristics of preamp circuits, which lead to errors and inaccurate eye monitor measurements.
Innovation Solution
The implementation of a receiver with a single correction preamp and a nonlinear preamp code mapping to correct for the nonlinear characteristics of the preamp, allowing for improved data recovery and accurate eye monitoring by combining offset correction, target voltage, and DFE tap signals into a single correction signal, thereby reducing bandwidth limitations and parasitic loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data bandwidth requirements increase to transmit more data in a short amount of time, then data transmission capacity is improved, but the ability of the receiver to accurately recover data from the incoming data stream deteriorates
Solution Approach 1:
The patent applies parameter changes by implementing a nonlinear preamp code mapping that transforms the relationship between preamp codes and corrected input voltage. Instead of a linear mapping, the system uses a nonlinear mapping function that compensates for the nonlinear characteristics of the preamp circuit at high bandwidths, thereby maintaining accurate data recovery even when transmitting more data in a short amount of time.
2Measurement precision
If multiple separate correction circuits are used for offset correction, target voltage, and DFE tap signals, then correction precision is improved, but device complexity and parasitic loading increase
Solution Approach 1:
The patent merges multiple separate correction circuits (offset correction, target voltage, and DFE tap signals) into a single correction preamp circuit. This single circuit receives a combined correction signal that integrates all three correction parameters, thereby reducing device complexity and parasitic loading while maintaining correction precision through the nonlinear code mapping.
Solution Approach 2:
The single correction preamp circuit is designed to perform multiple correction functions simultaneously - offset correction, target voltage adjustment, and DFE tap signal processing - all through one unified circuit and one combined correction signal, making the circuit universal and multi-functional.
3Adaptability or versatility
If multiple preamps are used for different correction signals, then correction capability is improved, but bandwidth limitations and parasitic loading increase
Solution Approach 1:
The patent combines multiple preamps that would handle different correction signals into a single correction preamp. This merger eliminates the bandwidth limitations and parasitic loading that would result from cascading or parallel multiple preamps, while the single preamp maintains full correction capability through the combined correction signal and nonlinear mapping.
Data Source
AI summary
A receiver includes a decision circuit, a circuit to adjust an input signal of the decision circuit, a correction circuit and a control circuit. The decision circuit makes a data decision based on an input signal of the decision circuit. The circuit to adjust the input signal of the decision circuit adjusts the input signal of the decision circuit based on an input correction signal. The correction circuit combines a plurality of signals corresponding to different input correction parameters into a preliminary input correction signal. An input of the correction circuit is coupled to an output of the decision circuit. The control circuit maps the preliminary input correction signal into the input correction signal using a nonlinear code mapping.