Sense Amplifier Leakage Reduction via Isolation
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Solution Overview
Problem
Semiconductor memory devices face challenges in reducing power consumption during active power-down modes due to unintended leakage currents caused by high voltage states, which increase overall power consumption.
Innovation Solution
The semiconductor device configures sense amplifiers to isolate circuit components from high voltages and reduces voltage differentials by setting isolation signals to an inactive state and increasing a low voltage reference, thereby reducing leakage current and overall current consumption during active power-down modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If memory places some portions in high voltage states during power-down mode, then memory operations can be suspended and power consumption reduced, but unintended leakage current occurs through the circuitry increasing power consumption
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage level of circuit components during power-down mode. Specifically, it transitions components from high voltage states to low voltage states when not actively needed, thereby reducing leakage current while maintaining the ability to quickly resume operations. This is achieved through controlled voltage scaling on select circuit nodes based on operational requirements.
Solution Approach 2:
The patent implements dynamics by making voltage states adjustable and time-dependent rather than static. Circuit components can dynamically switch between high voltage (for active operation) and low voltage (for power-saving) states based on real-time operational needs. This dynamic voltage adjustment allows the system to optimize between performance and power consumption continuously.
2Loss of time
If memory suspends circuitry at higher voltage state during power-down, then transition to normal operation is reduced, but leakage current causes additional power consumption
Solution Approach 1:
The patent applies local quality by differentiating voltage states across different circuit components rather than uniformly applying power-down to all components. Critical components that need to maintain readiness remain in higher voltage states, while non-critical components transition to lower voltage states. This selective approach reduces overall leakage current while preserving fast transition capability for essential functions.
Data Source
AI summary
Apparatuses and methods for operation of a sense amplifier during a power-down operation. The example apparatus may include a sense amplifier including of a transistor coupled between a digit line and a gut node of the sense amplifier. While a wordline coupled to a memory cell is activated, in response to entering a power-down mode, the transistor is disabled to decouple a digit line coupled to the memory cell from the gut node, which reduces leakage current in the sense amplifier.