Sense Amplifier Voltage Dynamics for Leakage Reduction
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Solution Overview
Problem
High-density memory architectures with vertical access devices and floating body architectures face significant leakage current issues due to voltage differentials, which can increase access times beyond performance specifications, and reducing voltages to mitigate leakage current compromises access times further.
Innovation Solution
A sense amplifier circuit dynamically adjusts activation and reference voltages during memory access operations, initially using higher ACT and lower RNL voltages to reduce leakage current and then switching to lower ACT and higher RNL voltages after an initial time period to balance access speed and leakage reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If higher voltages are applied to reduce leakage current, then leakage current is reduced, but access time increases beyond performance specifications
Solution Approach 1:
The patent applies dynamics by transitioning the sense amplifier from a static voltage state to a dynamic two-phase operation. Initially, the sense amplifier uses higher ACT and lower RNL voltages to reduce leakage current during the first portion of the access operation. Then, it switches to lower ACT and higher RNL voltages for the second portion to ensure fast transition rates meet performance specifications. This temporal dynamic adjustment resolves the contradiction between leakage reduction and speed requirements.
Solution Approach 2:
The patent implements periodic action by dividing the memory access operation into distinct time phases with different voltage configurations. The sense amplifier operates in a first phase with voltage settings optimized for leakage reduction, then transitions to a second phase with voltage settings optimized for fast transitions. This periodic switching of operational modes allows the system to achieve both leakage current reduction and performance specification compliance.
2Object-generated harmful factors
If voltages are reduced to mitigate leakage current, then leakage current decreases, but transition rates slow down
Solution Approach 1:
The sense amplifier dynamically adjusts its voltage configuration in two phases: first using higher ACT and lower RNL voltages to minimize leakage current, then switching to lower ACT and higher RNL voltages to accelerate transitions and meet timing specifications. This dynamic voltage switching resolves the trade-off between leakage reduction and transition speed.
Solution Approach 2:
The patent applies preliminary action by first applying voltage settings optimized for leakage reduction during the initial portion of the access operation, before transitioning to the second phase. This preliminary phase prepares the circuit state while minimizing leakage, and the subsequent phase ensures fast transitions occur within performance specifications.
Data Source
AI summary
Apparatuses, sense amplifier circuits, and methods for operating a sense amplifier circuit in a memory are described. An example apparatus includes a sense amplifier circuit configured to be coupled to a digit line and configured to, during a memory access operation, drive the digit line to a voltage that indicates the logical value of the charge stored by a memory cell coupled to the digit line. During an initial time period of the memory access operation, the sense amplifier circuit is configured to drive the digit line to a first voltage that indicates the logical value of the charge stored by the memory cell. After the initial time period, the sense amplifier circuit is configured to drive the digit line to a second voltage different than the first voltage that indicates the logical value of the charge stored by the memory cell.