Word Line Driver Architecture for Faster Non-Volatile Memory Reads
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Solution Overview
Problem
Non-volatile memory circuits face performance degradation during read operations due to the high threshold voltage of high voltage devices used in word line drivers, which slows down read mode performance and affects the speed of voltage control and power supply range.
Innovation Solution
A novel word line driver architecture is introduced, incorporating a bypass path and a negative pumping circuit to enhance driving strength and speed up voltage control, utilizing a combination of high and low threshold voltage devices to improve read mode performance while maintaining program performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage devices with high threshold voltage are used in word line drivers to tolerate high voltage for programming, then program performance is maintained, but read operation performance degrades due to slow switching speed
Solution Approach 1:
The word line driver is segmented into two separate drivers: a first word line driver using high threshold voltage devices for programming operations, and a second word line driver using low threshold voltage devices for read operations. This segmentation allows each driver to be optimized for its specific function, resolving the contradiction between program reliability and read speed.
Solution Approach 2:
The system dynamically switches between two different word line driver configurations based on the operation mode. During programming, the first driver with high threshold voltage devices is activated; during reads, the second driver with low threshold voltage devices is activated. This dynamic adaptation allows the system to maintain optimal performance for each operation type.
2Reliability
If high threshold voltage devices are used to ensure high voltage tolerance, then device reliability under high voltage is improved, but voltage control speed and power supply range are reduced
Solution Approach 1:
The voltage control function is segmented between two driver circuits: one dedicated to high voltage programming control with high threshold voltage devices, and another dedicated to low voltage read control with low threshold voltage devices. This eliminates the time penalty associated with using high threshold voltage devices for all operations.
Solution Approach 2:
The system changes the threshold voltage parameter of the driver devices based on the operation mode. High threshold voltage devices are used when high voltage tolerance is needed for programming, while low threshold voltage devices are used when fast voltage control is needed for reads, optimizing both reliability and speed.
3Device complexity
If a single word line driver is used for both programming and reading, then device complexity is reduced, but performance is compromised during read operations
Solution Approach 1:
The single word line driver is segmented into two specialized drivers: one for programming and one for reading. Although this increases device complexity, it dramatically improves read mode performance by using low threshold voltage devices that switch faster, while the programming function maintains its reliability with high threshold voltage devices.
Data Source
AI summary
A method comprises providing a trigger signal, generating an input pulse according to the trigger signal, inverting the input pulse to generate an inverted input pulse and pulling down an output voltage using the inverted input pulse, wherein the inverted pulse is applied to a transistor of a high threshold voltage circuit.