Bitline Sense Amplifier Noise Reduction via Temperature Timing
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Solution Overview
Problem
Semiconductor memory devices face challenges in reducing sensing noises, particularly due to process, voltage, and temperature (PVT) variations, data pattern noise, and charge leakage, which degrade the performance and effective sensing margin of bitline sense amplifiers.
Innovation Solution
A semiconductor memory device is designed with a bitline sense amplifier having an open bitline structure and a plurality of switching transistors. A temperature measurement circuit generates a temperature code based on the operation temperature, and a sense amplifier controller adjusts the timing of switching signals to reduce sensing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bitline sense amplifier operates at high speed, then productivity is improved, but sensing noise increases due to PVT variations and charge leakage
Solution Approach 1:
The patent applies dynamics by making the sense amplifier's operating characteristics adjustable through temperature-coded control signals. The sense amplifier transitions from a static design to a dynamic one where switching timings and operational parameters are adjusted based on measured temperature conditions, allowing optimization of both speed and noise performance across different operating temperatures
Solution Approach 2:
The patent changes physical parameters of the sense amplifier operation based on temperature. Specifically, it modifies switching timings of control signals and operational parameters of the sense amplifier circuit according to temperature-coded values, thereby adjusting the amplifier's characteristics to maintain optimal performance while reducing sensing noise at different temperatures
2Reliability
If the sensing margin is increased to reduce noise impact, then reliability is improved, but the operation timing complexity increases
Solution Approach 1:
The patent implements feedback by measuring the actual operating temperature of the memory device and using this information to adjust the sense amplifier's operation. The temperature measurement circuit provides feedback to the control logic, which then generates appropriate temperature-coded control signals to optimize the sensing margin and reduce noise impact based on real-time conditions
Solution Approach 2:
The patent applies preliminary action by pre-determining optimal operating parameters and switching timings for different temperature conditions. Before actual sensing operations, the system measures temperature and pre-configures the sense amplifier with appropriate control signals, eliminating the need for complex real-time adjustments during sensing operations
Data Source
AI summary
Provided is a semiconductor memory device and a method of operating same, the semiconductor memory device including: a memory cell array including a memory cell; a bitline sense amplifier having an open bitline structure and including a plurality of switching transistors, wherein the bitline sense amplifier is connected to the memory cell via a bitline and a complementary bitline, and the plurality of switching transistors are configured to control connections between the bitline, the complementary bitline, a sensing bitline and a complementary sensing bitline based on a plurality of switching signals; a temperature measurement circuit configured to measure an operation temperature of the semiconductor memory device and to generate a temperature code corresponding to the operation temperature; and a sense amplifier controller configured to reduce sensing noise of the bitline sense amplifier by controlling timing of the plurality of switching signals based on the temperature code.