Sense Amplifier Determination Circuit With Capacitive Pull-Down
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Solution Overview
Problem
Semiconductor memory devices face challenges in determining data quickly due to slow potential changes at low temperatures and decreasing power voltages, which prolong the time needed to form a sufficient potential difference between bit lines, leading to increased current consumption when trying to accelerate this process.
Innovation Solution
A determination circuit with a capacity component coupled to a node that accelerates the sense amplifier's operation by pulling down the common source node's potential, facilitating quicker transition to a steady state and reducing the time for determining the sense result, while also allowing for lower current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the determination circuit operates at higher speed to determine data quickly, then the determination speed is improved, but the current consumption increases
Solution Approach 1:
The bit lines are precharged to a mid-level potential before the read operation. This preliminary action reduces the voltage swing required during the read operation, allowing faster determination while reducing the current consumption compared to full voltage swing operations.
Solution Approach 2:
The patent changes the potential parameter of the bit lines by using a mid-level precharge potential instead of traditional full voltage levels. This parameter change enables the determination circuit to operate faster with lower current consumption by reducing the voltage differential that needs to be established during the read operation.
2Use of energy by moving object
If the power voltage is decreased to reduce current consumption, then the current consumption is reduced, but the time to form potential differences in bit lines increases
Solution Approach 1:
The bit lines are precharged to a mid-level potential before the read operation. This preliminary action ensures that the bit lines are already at an intermediate state, so when the read operation begins, the potential difference can form more quickly even with lower power voltage, reducing the time loss.
Solution Approach 2:
By changing the voltage parameter to use mid-level precharge potentials, the patent enables faster potential difference formation at lower power voltages. The reduced voltage swing required from the mid-level state allows the determination circuit to reach its decision threshold faster, compensating for the lower power voltage.
3Use of energy by moving object
If the precharge potential is kept low to reduce current consumption, then the current consumption is reduced, but the sense amplifier operation speed decreases
Solution Approach 1:
The bit lines are precharged to a mid-level potential, which is lower than full voltage but higher than ground. This preliminary charging to an intermediate level reduces current consumption while still providing sufficient voltage headroom for the sense amplifier to operate at high speed during the actual read operation.
Solution Approach 2:
The patent optimizes the precharge potential parameter to a mid-level value that balances current consumption and operation speed. This intermediate voltage level provides the right compromise: low enough to reduce current consumption but high enough to maintain fast sense amplifier operation during the read operation.
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 enhances the speed of the sense amplifier's operation, allowing for quicker determination of data and reducing power consumption, especially in low-temperature environments and with decreasing power voltages.
Implementation Method 1
A first capacity component includes a first end which receives an inversion signal of the first signal
Data Source
AI summary
A determination circuit of one embodiment includes first and second inverter circuits, a first transistor which turns on when receiving an asserted first signal, and a first capacity component including a first end which receives an inversion signal of the first signal. The second inverter circuit includes an input coupled to an output of the first inverter circuit, and includes an output coupled to an input of the first inverter circuit. The first node is coupled to a first potential node, the first transistor is coupled between the second node and a second potential node having a lower potential than a potential of the first potential node, and a second end of the first capacity component is coupled to the second node.