Output Driver Timing Control for Data-Dependent Noise
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Solution Overview
Problem
Data dependent noise, including cross-talk and simultaneous switching noise, limits the speed of data transmission in memory devices by introducing variations in signal propagation times, necessitating delays and reducing communication efficiency between devices.
Innovation Solution
Implementing a driver controller in each driver circuit to monitor data sequences and adjust parameters such as slew rate or timing to compensate for data dependent noise, thereby mitigating cross-talk and simultaneous switching noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data transmission speed is increased, then communication efficiency is improved, but data dependent noise (cross-talk and simultaneous switching noise) increases, causing signal propagation time variations
Solution Approach 1:
The driver controller predicts data dependent noise effects in advance by monitoring the sequence of data transmitted by other drivers, and preemptively adjusts signal parameters (slew rate, timing) before the noise occurs, thereby compensating for cross-talk and simultaneous switching noise effects
Solution Approach 2:
The driver controller continuously monitors the sequence of data transmitted by other drivers in the driver array, uses this feedback information to predict when data dependent noise will occur, and dynamically adjusts signal parameters in response to maintain synchronized data transmission
2Reliability
If delays are added to compensate for data dependent noise, then signal synchronization is improved, but transmission time increases
Solution Approach 1:
The driver controller dynamically adjusts signal parameters (slew rate, timing) in real-time based on the predicted data dependent noise effects, rather than using fixed delays, thereby maintaining signal synchronization while minimizing transmission time
Solution Approach 2:
The driver controller changes signal parameters such as slew rate and timing based on the sequence of data being transmitted, adjusting these parameters dynamically to compensate for data dependent noise without introducing excessive delays
Data Source
AI summary
Techniques for controlling a driver to reduce data dependent noise, such as simultaneous switching effects and cross-talk effects. A plurality of drivers may each receive a data segment to transmit and a plurality of data segments that other drivers will transmit. A driver controller may adjust the time at which the data segment is transmitted in response to the plurality of data segments that the other drivers will transmit. The adjustment may compensate for simultaneous switching noise and cross-talk by, for example, delaying the transmission of a data segment or changing the slew rate of the signal carrying the data segment.