Pseudo-Open Drain Output Driver De-Emphasis Control
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Solution Overview
Problem
Semiconductor memory devices face challenges in efficiently managing power consumption during data output due to the activation of de-emphasis modes, which can lead to increased current consumption and leakage, especially during idle states and narrow read gaps.
Innovation Solution
Implementing a pseudo-open drain (POD) type output driver with a de-emphasis function, controlled by a logic that activates the de-emphasis mode only during data output periods, using a de-emphasis enable signal to minimize power consumption and prevent DC leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If de-emphasis mode is continuously activated in POD type output driver, then signal integrity is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by activating de-emphasis mode only during specific output periods when data is being transmitted, rather than continuously. The control logic generates de-emphasis enable signals that are timed to coincide with data output periods, thereby maintaining signal integrity during transmission while avoiding unnecessary power consumption during idle periods.
Solution Approach 2:
The patent implements dynamics by making the de-emphasis mode dynamically controllable through control logic that responds to read commands and output enable signals. The de-emphasis enable signal is generated based on the timing of data output operations, allowing the system to adaptively switch between de-emphasis and normal modes to optimize the trade-off between signal integrity and power consumption.
2Reliability
If de-emphasis mode is activated during idle states, then signal quality is maintained, but leakage current increases
Solution Approach 1:
The control logic generates de-emphasis enable signals that are periodic and synchronized with data output operations. The de-emphasis mode is activated only during periods when data is being output and is deactivated during idle states, thereby maintaining signal quality during transmission while preventing leakage current during non-transmission periods.
3Reliability
If de-emphasis mode is activated for narrow read gaps, then data integrity is improved, but power consumption increases
Solution Approach 1:
The control logic dynamically adjusts the de-emphasis mode activation based on the timing of read operations and output enable signals. For narrow read gaps, the de-emphasis mode is activated only during the specific output periods when data is being transmitted, providing data integrity protection without continuously consuming additional power during the entire read gap period.
Data Source
AI summary
A semiconductor memory device includes a memory cell array, an output driver having a pseudo-open drain (POD) structure and providing read data from the memory cell array in a de-emphasis mode, and control logic controlling the output driver in response to a read command to activate the de-emphasis mode. The control logic activates the de-emphasis mode only during an output period during which the read data is output by the output driver.