Sense Amplifier Body Effect Dynamics for Low Voltage Memory
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Solution Overview
Problem
Current memory cell sensing operations in semiconductor memory devices face inefficiencies due to high energy consumption from parasitic currents through transistors in data latches, particularly when using low threshold voltage (VT) transistors, which increase energy per bit and reduce performance.
Innovation Solution
The body effect of low VT transistors in sense amplifier circuits is dynamically adjusted by varying the source to bulk voltage to minimize parasitic currents during data latching and storage, reducing energy consumption while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low threshold voltage transistors are used in data latches, then energy consumption is reduced, but parasitic currents increase
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the body effect of low VT transistors during sensing operations. The body effect is increased when transistors are in non-conducting states to reduce parasitic currents, and decreased when transistors need to conduct to maintain low energy consumption. This time-varying adjustment resolves the contradiction between energy efficiency and parasitic current reduction.
Solution Approach 2:
The patent changes the electrical parameters (body effect, threshold voltage) of the transistors based on operational states. By varying the body effect parameter dynamically, the system optimizes the trade-off between energy consumption and parasitic currents. This parameter modulation allows the same transistor to exhibit different characteristics at different times, resolving the inherent contradiction.
2Object-generated harmful factors
If body effect of low VT transistors is increased, then parasitic currents are reduced, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by applying body effect enhancement only during specific phases (when transistors are non-conducting) rather than continuously. This periodic modulation of the body effect allows parasitic currents to be suppressed at critical moments while avoiding continuous energy expenditure, thus resolving the contradiction between reducing harmful effects and maintaining energy efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-enhancing the body effect before parasitic currents become problematic. By proactively adjusting the body effect in anticipation of high parasitic current conditions, the system prevents harmful effects without requiring continuous high energy input, thereby resolving the contradiction between harm reduction and energy consumption.
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
This approach reduces energy per bit of memory cell sensing operations by minimizing parasitic currents, enhancing the overall efficiency and performance of memory systems.
Implementation Method 1
The body effect of low VT transistors in sense amplifier circuits is dynamically adjusted by varying the source to bulk voltage
Data Source
AI summary
Systems and methods for reducing the energy per bit of memory cell sensing operations, such as memory read operations, by dynamically adjusting the body effect of data latch transistors during the sensing operations are described. A significant component of the energy required to perform the memory cell sensing operations may correspond with the parasitic currents through low threshold voltage (VT) transistors of data latches within sense amplifier circuits. In order to reduce the energy per bit of the memory cell sensing operations while using a reduced supply voltage for the data latches, the body effect of a select number of the low VT transistors within the data latches may be dynamically adjusted such that the body effect is minimized or nonexistent during the latching of new data into the data latches and then increased after the new data has been latched within the data latches.