Sense Amplifier Voltage Supply Circuit for Low-Voltage Memory Sensing
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Solution Overview
Problem
Semiconductor memory devices face challenges in maintaining sensing margin and operating speed during low-voltage operation due to reduced voltage differences between bit lines and complementary bit lines, leading to potential sensing errors and increased current consumption.
Innovation Solution
The semiconductor memory device employs a voltage supply circuit that generates and supplies specific source voltages to NMOS and PMOS transistors, either lower than or higher than the target source voltage, to enhance the sensing margin and speed without decreasing transistor threshold voltages, using a combination of voltage generation and switch circuits to manage these voltages during data sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold voltage of transistors in the sense amplifier is decreased to secure sensing margin, then sensing margin is improved, but sensing errors and current consumption increase due to leakage current
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the source voltage of transistors in the sense amplifier during the sensing operation. Instead of changing the threshold voltage (which causes leakage), the invention changes the source voltage parameter to enhance the voltage difference between bit lines, thereby improving sensing margin without compromising reliability. The source voltage is adjusted based on the sensing stage requirements, allowing optimal performance without increasing leakage current.
2Use of energy by moving object
If the external voltage applied to the semiconductor memory device is decreased to reduce operating voltage, then operating voltage is reduced, but the voltage difference between bit line and complementary bit line diminishes leading to reduced sensing performance
Solution Approach 1:
The patent applies preliminary anti-action by proactively compensating for the reduced voltage difference caused by low external voltage. The voltage supply circuit detects the low voltage condition and preemptively adjusts the source voltage of sense amplifier transistors to counteract the diminished bit line voltage difference. This preliminary compensation ensures that sensing performance is maintained despite the reduced external operating voltage.
Solution Approach 2:
The invention changes the source voltage parameter dynamically based on external voltage conditions. When external voltage is reduced, the source voltage is adjusted to maintain adequate voltage difference for sensing. This parameter adaptation allows the sense amplifier to operate effectively across a wide range of external voltages without sacrificing sensing precision.
3Use of energy by moving object
If miniaturization of semiconductor fabrication techniques is pursued to decrease operating voltage, then operating voltage decreases, but sensing margin and operating speed are compromised
Solution Approach 1:
The patent applies dynamics by making the source voltage adjustable and adaptive rather than fixed. The voltage supply circuit dynamically modifies the source voltage based on real-time sensing requirements and operating conditions. This dynamic adjustment allows the sense amplifier to maintain high operating speed even when external voltage is reduced due to miniaturization, as the source voltage can be optimized for each sensing operation.
Data Source
AI summary
A semiconductor memory device is provided. The semiconductor memory device supplies to a sense amplifier a first voltage and a second voltage during data sensing, so that data sensing margin and a data sensing speed increase.