Memory Output Driver Wake-Up Timing for Lower Power
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Solution Overview
Problem
Memory devices face challenges in reducing power consumption during transitions from a sleep state to an operational state, leading to inefficient power management and potential premature operations.
Innovation Solution
The implementation of a memory device with a sleep tracking signal delayed through buffer circuits and a wake-up detection circuit to accurately determine when the transition is complete, reducing power consumption by controlling the output driver's operation based on the delayed signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the output driver is activated immediately when the sleep control signal changes state, then the response speed is improved, but power consumption increases due to premature operation before memory cells are ready
Solution Approach 1:
The patent introduces a wake-up detection circuit that performs preliminary detection before enabling the output driver. This circuit monitors whether the memory cells have completed their wake-up sequence and are ready to output data, and only enables the output driver when this condition is met, preventing premature operation and associated power waste
Solution Approach 2:
The patent implements a feedback mechanism through the wake-up detection circuit that continuously monitors the state of memory cells during wake-up. The detection circuit provides feedback information to the output driver enable logic, allowing the system to adjust the timing of output driver activation based on the actual readiness state of memory cells, thereby optimizing both response speed and power consumption
2Use of energy by moving object
If the output driver is controlled to wait for memory cell readiness, then power consumption is reduced, but the transition time increases
Solution Approach 1:
The wake-up detection circuit performs preliminary monitoring of memory cell readiness during the wake-up sequence. By detecting readiness in advance and using this information to time the output driver enable signal, the system minimizes unnecessary waiting time while still ensuring power is only consumed when needed
Solution Approach 2:
The wake-up detection circuit acts as an intermediary between the sleep control signal and the output driver enable signal. This intermediary circuit processes the wake-up sequence completion status and uses it to intelligently control the output driver timing, balancing the competing requirements of fast response and low power consumption
Data Source
AI summary
Disclosed herein are related to reducing power consumption of a memory device when transitioning from a sleep state to an operational state. In one aspect, the memory device includes a memory cell to store data. In one aspect, the memory device includes an output driver configured to: generate an output signal indicating the stored data, in response to a sleep tracking signal indicating that the memory cell is in the operational state, and generate the output signal having a predetermined voltage irrespective of the stored data, in response to the sleep tracking signal indicating that the memory cell is in the sleep state. In one aspect, the sleep tracking signal is delayed from a sleep control signal causing the memory cell to operate in the sleep state or the operational state.