Input Receiver Crosstalk Compensation for Memory Signal Integrity
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Solution Overview
Problem
Crosstalk noise between signal lines in semiconductor memory systems affects signal integrity, causing input receivers to capture erroneous commands, addresses, and data due to capacitive coupling, which becomes more pronounced as memory devices decrease in size and increase in bandwidth.
Innovation Solution
An input receiver circuit that uses input signals from adjacent signal lines to generate a mitigation signal, which is applied to a differential pair circuit to reduce or eliminate the effect of crosstalk noise, ensuring accurate capture of input signals by matching the crosstalk noise and compensating for its impact on the signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If memory devices are miniaturized to increase bandwidth and data capacity, then productivity and data capacity improve, but crosstalk noise between signal lines increases due to reduced spacing
Solution Approach 1:
The patent measures the actual crosstalk noise present on signal lines and uses this harmful effect to generate a compensation signal that mimics the crosstalk characteristics. By injecting this compensation signal into adjacent signal lines, the system converts the harmful crosstalk into a useful reference for noise cancellation, allowing input receivers to accurately capture signals despite the presence of crosstalk noise in miniaturized memory architectures
Solution Approach 2:
The patent dynamically adjusts the compensation signal parameters (amplitude, timing, polarity) based on measured crosstalk characteristics. By changing these parameters to match the actual crosstalk profile, the system effectively counteracts the noise interference while maintaining signal integrity in high-density memory configurations
2Area of stationary object
If signal lines are placed closer together to increase memory density, then area efficiency improves, but signal integrity deteriorates due to increased capacitive coupling
Solution Approach 1:
The patent introduces a compensation signal as an intermediary element between the crosstalk noise and the input receiver. This compensation signal acts as a mediator that pre-conditiones the signal environment by injecting correlated noise that cancels out the harmful crosstalk, allowing reliable signal capture even when signal lines are densely packed with minimal spacing
3Productivity
If bandwidth is increased to improve performance, then productivity improves, but the susceptibility to crosstalk noise increases
Solution Approach 1:
The patent implements a feedback mechanism where crosstalk noise is measured from signal lines, processed to generate compensation signals, and then injected back into the system. This closed-loop feedback approach continuously adapts to the actual crosstalk conditions, enabling high-bandwidth operation while maintaining immunity to crosstalk noise through dynamic compensation
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 solution effectively reduces crosstalk noise, allowing input signals to meet specifications for proper capture by input receivers, thereby enhancing signal integrity and reducing errors in semiconductor memory systems.
Implementation Method 1
Signals on the other signal lines may contribute to crosstalk noise in the input signal on the signal line
Data Source
AI summary
An input receiver circuit for a signal line may receive inputs from other signal lines to mitigate crosstalk noise present on the signal line. In some examples, the input receiver circuit may include a transistor with a programmable width. In some examples, the input receiver circuit may include a bias current generator with a programmable current. The width and/or current may be programmed based on an amount of crosstalk noise introduced by the other signal line. In some examples, the input receiver circuit may include a resistance and/or a capacitance. In some examples the resistor and/or capacitor may be programmable. The resistance and/or capacitance may be programmed based on a duration of the crosstalk noise on the signal line.