Adjustable Data Drivers for Crosstalk-Aware Signal Transitions
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Solution Overview
Problem
In densely packed semiconductor integrated circuits, closely positioned signal lines experience crosstalk and pattern-dependent impedance mismatch, leading to signal transitions being inhibited or affected, compromising performance due to signal reflections and interference.
Innovation Solution
An output signal driver circuit with a detection circuit and a driver adjust circuit that adjusts data drivers based on characteristics of the data signals, such as logic levels and signal transitions, to optimize drive strength and impedance, thereby addressing crosstalk and impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are positioned in close proximity to increase circuit density, then circuit complexity and compactness are improved, but crosstalk and signal interference occur between adjacent signal lines
Solution Approach 1:
The patent applies preliminary anti-action by detecting the transition states of adjacent signal lines before the crosstalk fully affects the signal integrity. The detection circuit identifies when adjacent lines are transitioning and preemptively adjusts the drive strength of the data driver to compensate for the anticipated crosstalk effect, thereby maintaining signal integrity despite the close proximity of signal lines
Solution Approach 2:
The patent implements dynamics by making the drive strength of the data driver adjustable and adaptive rather than fixed. The driver adjust circuit dynamically modifies the drive strength based on real-time detection of adjacent signal line transitions, allowing the system to optimize performance for different signaling patterns and maintain signal integrity under varying conditions
2Productivity
If adjacent signal lines transition to opposite logic levels, then data transmission capability is improved, but signal transitions are inhibited due to crosstalk
Solution Approach 1:
The detection circuit identifies when adjacent signal lines are transitioning to opposite logic levels and preemptively adjusts the drive strength to counteract the inhibiting crosstalk effect, ensuring that the signal transition speed is maintained despite the opposing transitions on adjacent lines
Solution Approach 2:
The patent changes the drive strength parameter of the data driver dynamically based on the detected transition patterns of adjacent signal lines. When opposite logic level transitions are detected, the drive strength is increased to overcome the crosstalk inhibition and maintain the desired signal transition speed
3Area of stationary object
If signal lines are closely spaced, then area utilization is improved, but pattern dependent impedance mismatch causes signal reflections
Solution Approach 1:
The patent applies dynamics by making the drive strength adjustable based on the detected signaling patterns. The system adapts the drive strength in response to different patterns of adjacent line transitions, thereby compensating for the pattern-dependent impedance mismatch and reducing signal reflections that would otherwise occur in closely spaced signal lines
Solution Approach 2:
The patent implements feedback through the detection circuit that monitors the transition states of adjacent signal lines and provides information to the driver adjust circuit. This feedback loop enables the system to detect impedance mismatch conditions and adjust the drive strength accordingly, thereby maintaining signal integrity despite the closely spaced signal line configuration
Data Source
AI summary
Apparatuses and methods for driving input data signals onto signal lines as output data signals are disclosed. An example apparatus includes a detection circuit, a driver adjust circuit, and a data driver. The detection circuit is configured to detect a characteristic(s) of a group of input data signals to be driven onto adjacent signal lines. A characteristic could be, for example, a particular combination of logic levels and/or transitions for the group of input data signals. The driver adjust circuit is configured to provide a driver adjustment signal based at least in part on a detection signal, that is provided by the detection circuit. A data driver is configured to drive a respective one of the group of input data signals as a respective one of the output data signals, wherein the data driver is adjusted based at least in part on the driver adjustment signal.