Memory Output Driver Pre-Emphasis for Faster Signal Transitions
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Solution Overview
Problem
High-speed data transmission systems require enhanced driving capability in output drivers, which is not adequately addressed by existing technologies.
Innovation Solution
The implementation of a pre-emphasis output driver configuration that includes a main output driver, pre-emphasis controller, pre-emphasis pre-driver, and pre-emphasis driver, utilizing high supply voltages to rapidly transition output data between internal and ground voltages, and generating pre-emphasis pull-up control signals to emphasize output data transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of the output driver is increased to enhance driving capability, then the driving capability is improved, but the transition speed of output data deteriorates
Solution Approach 1:
The patent applies preliminary action by generating pre-emphasis signals before the main output driver transitions. The pre-emphasis driver activates pull-up or pull-down transistors in advance based on detected transition edges, preparing the output line for faster switching. This preliminary preparation allows the main driver to achieve rapid transitions without requiring excessive size, resolving the contradiction between driving capability and transition speed.
Solution Approach 2:
The patent implements dynamics by making the output driver configuration adaptive and variable. The pre-emphasis controller dynamically adjusts the activation of pre-emphasis drivers based on real-time detection of data transitions. This dynamic adjustment allows the system to optimize transition speed on-demand without permanently increasing the static size of the output driver, thereby maintaining both driving capability and fast transition performance.
2Power
If the size of the output driver is increased to enhance driving capability, then the driving capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the output driver into distinct functional modules: a main output driver for steady-state operation and a pre-emphasis driver for transition enhancement. The pre-emphasis driver is further segmented into separate pull-up and pull-down sections controlled by independent signals. This modular segmentation allows the system to achieve enhanced driving capability through coordinated operation of specialized sub-components rather than through monolithic size increase, thereby managing device complexity more effectively.
Data Source
AI summary
An output driver includes a main output driver configured to receive data of an internal supply voltage to generate output data of an output supply voltage, and to receive the data of a ground voltage to generate the output data of the ground voltage, a pre-emphasis controller configured to detect a transition of the data from the ground voltage to the internal supply voltage to generate a first pulse signal, and to receive a pre-emphasis enable signal and the first pulse signal and generate a level-up pre-emphasis enable signal and a first level-up pulse signal of the ground voltage, a pre-emphasis pre-driver configured to generate one or more pre-emphasis pull-up control signals, and a pre-emphasis driver configured to pre-emphasize the output data based on the output data transitioning from the ground voltage to the output supply voltage.