Page Buffer Reference Current Precharge for Memory Reliability
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Solution Overview
Problem
Memory systems face reliability issues due to rapid current spikes during simultaneous high-current operations, leading to temporary current shortages and erroneous device operations.
Innovation Solution
A page buffer and memory device design that includes a reference current generation unit, current sensing unit, and data sensing units to reduce sensing time in read and verify operations by using reference currents and switching signals to manage bit line voltages and store data efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple high-current operations are performed simultaneously in a memory device, then the processing throughput is improved, but the current consumption spikes rapidly causing temporary current shortages and erroneous operations
Solution Approach 1:
The patent applies preliminary action by precharging the bit line to a reference voltage level before the actual sensing operation begins. The reference current generation unit prepares the bit line in advance, ensuring that when multiple operations are performed simultaneously, each operation starts from a known stable state, preventing current spikes that would occur if bit lines were charged during the operation itself.
Solution Approach 2:
The patent segments the current generation function by separating the reference current generation unit from the main sensing circuitry. This allows the reference current to be generated independently and used to precharge bit lines, enabling multiple sensing operations to proceed simultaneously without competing for the same current resources, thus maintaining both high throughput and operational reliability.
2Productivity
If the sensing time is reduced to improve operation speed, then the productivity is improved, but the sensing precision may be compromised
Solution Approach 1:
The patent changes the parameter of reference voltage by precharging the bit line to a specific reference voltage level determined by the reference current. This allows the sensing operation to detect voltage changes relative to a known reference point, enabling fast sensing decisions to be made within reduced timeframes while maintaining precision through the established reference baseline.
Solution Approach 2:
The patent substitutes the traditional mechanical charging process with an electrical reference current-based precharging mechanism. Instead of relying on slow capacitive charging through resistors, the reference current generation unit rapidly establishes the bit line voltage to a precise reference level, enabling both fast sensing speeds and high precision through electrical field control rather than mechanical time constants.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces sensing time in memory operations, enhancing the reliability of memory systems by managing current spikes and improving data storage efficiency.
Implementation Method 1
a reference current generation unit configured to precharge a bit line by generating a reference current
Implementation Method 2
a current sensing unit configured to change or maintain a voltage of a select node, based on a change in current of the bit line
Data Source
AI summary
There are provided a page buffer and a memory device having the same. A page buffer includes a reference current generation unit for precharging a bit line by generating a reference current, a current sensing unit for changing or maintaining a voltage of a select node, based on a change in current of the bit line, a first data sensing unit for storing first data, based on a change in the voltage of the select node, and a second data sensing unit for, when the first data is stored in the first data sensing unit, consecutively storing second data, based on the change in the voltage of the select node.