ReRAM Sensing Circuit Dual Amplifier Time Reduction
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Solution Overview
Problem
Conventional Resistive Random Access Memory (ReRAM) devices face challenges in reducing sensing time, particularly when reading high resistance values, as it requires increased sensing time due to the need for a voltage level to become constant, which affects data reading efficiency.
Innovation Solution
The implementation of a dual amplifier system, where a first amplifier detects and amplifies the sensing current, and a second amplifier stores and further amplifies this current, reducing overall sensing time by adjusting capacitance and resistance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional ReRAM sensing method is used, then data reading is possible, but sensing time is increased when reading high resistance values
Solution Approach 1:
The first amplifier performs preliminary amplification of the sensing current before it is stored in the capacitor. This preliminary action ensures that the voltage level reaches stability faster, reducing the sensing time required when reading high resistance values.
Solution Approach 2:
The patent implements a feedback mechanism where the amplified sensing current is stored in a capacitor and fed back to the first amplifier for further amplification. This feedback loop accelerates the voltage level stabilization process, thereby reducing sensing time and improving data reading efficiency.
2Loss of time
If dual amplifier system is implemented, then sensing time is reduced, but device complexity is increased
Solution Approach 1:
The amplification function is segmented into two distinct amplifiers with specialized roles. The first amplifier handles initial current amplification while the second amplifier (operating as a latch) maintains the signal state. This segmentation allows each component to be optimized for its specific function, reducing overall sensing time despite increased device complexity.
Solution Approach 2:
A capacitor is introduced as an intermediary element between the two amplifiers to store the amplified sensing current. This intermediary component facilitates the feedback mechanism and enables the dual amplifier system to operate effectively, achieving reduced sensing time while managing the complexity through clear functional separation.
Data Source
AI summary
The resistive random access memory (ReRAM) device includes a first amplifier configured to amplify a sensing current corresponding to data sensed in a memory cell, and a second amplifier configured to store the sensing current amplified by the first amplifier, and amplify electric charges when storing the amplified sensing current.