Integrated Circuit Control Voltage Generation for Memory Reading Margin
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Solution Overview
Problem
As the integration of non-volatile memory devices increases, the cell current decreases, leading to a narrowed voltage level variation range in bit lines, which reduces the reading margin and slows down the operation speed due to the need for longer time to identify cell states.
Innovation Solution
A control voltage generation circuit that includes a node setting block, multiple control voltage generation units, and a current sensing circuit to generate variable control voltages, reducing power consumption and area while controlling operations that detect current variations in signal transmission lines connected to internal circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the degree of integration of non-volatile memory device is increased and low power is used, then power consumption is reduced and capacity is increased, but cell current decreases leading to narrowed voltage level variation range and reduced reading margin
Solution Approach 1:
The patent changes the voltage level parameters of the bit line by applying different voltages (first voltage, second voltage, third voltage) to the bit line at different time points. This parameter change enables the sensing circuit to detect cell states even when cell current is low due to high integration and low power operation, thereby maintaining reading margin without increasing power consumption.
2Quantity of substance
If the degree of integration of non-volatile memory device is increased, then capacity is increased, but cell current decreases leading to longer time required to identify cell state and reduced operation speed
Solution Approach 1:
The patent applies preliminary actions by pre-charging the bit line to specific voltage levels (first voltage, second voltage, third voltage) before the sensing operation. This preliminary voltage setup enables the sensing circuit to quickly detect cell states by comparing against predetermined thresholds, thereby maintaining operation speed despite high integration that reduces cell current.
3Adaptability or versatility
If conventional control voltage generation circuit is used, then control voltages can be generated, but circuit complexity and area are large due to multiple elements required
Solution Approach 1:
The patent makes the bit line itself serve multiple functions: it acts as both the signal transmission line for data storage and as the sensing line for detecting cell states. By reusing the bit line for both purposes and controlling its voltage levels dynamically, the patent eliminates the need for separate dedicated sensing lines and complex control voltage generation circuits, thereby reducing circuit area and complexity while maintaining full control voltage generation capability.
Data Source
AI summary
An integrated circuit includes a node setting block connected to a reference node and suitable for setting a voltage level of the reference node to a reference voltage level, a plurality of control voltage generation units connected in series to a reference node and suitable for generating a plurality of control voltages of which voltage level is variable and a current sensing circuit suitable for sensing a variation of a current flowing through a signal transmission line by using the plurality of control voltages, the signal transmission line connected to an internal circuit and a voltage level of the signal transmission line being fixed.