Memory Device Channel Modulation to Reduce Signal Interference
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Solution Overview
Problem
Signal transmission by memory devices causes interference with signal reception, affecting various operations and impacting performance in memory systems.
Innovation Solution
Implementing a modulation scheme that reduces interference by using a first modulation scheme with a larger voltage range for data signaling and a second modulation scheme with a smaller voltage range for error detection signaling, thereby minimizing interference between transmitted and received signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a memory device transmits signals to a host device, then data communication is enabled, but electromagnetic interference is generated that affects signal reception at the same memory device
Solution Approach 1:
The patent segments the signal transmission into two distinct channels: a first channel for transmitting data signals from host to memory device, and a second channel for transmitting error detection signals from memory device to host. This segmentation allows independent optimization of each channel's voltage characteristics, enabling the error detection channel to use a smaller voltage range that generates less electromagnetic interference while maintaining data communication functionality.
Solution Approach 2:
The patent applies different voltage range characteristics to different signaling channels based on their specific functional requirements. The data signaling channel uses a larger voltage range for robust data transmission, while the error detection signaling channel uses a smaller voltage range to minimize electromagnetic interference. This local quality differentiation resolves the contradiction by optimizing each channel's voltage characteristics for its specific purpose.
2Reliability
If error detection signaling is transmitted from memory device to host device, then data integrity is verified, but interference with incoming data signals is increased
Solution Approach 1:
The patent separates error detection signaling from data signaling by assigning them to different channels with different voltage ranges. The error detection signals are transmitted using a smaller voltage range on the second channel, which reduces the electromagnetic interference generated during transmission while still enabling verification of data integrity through the error detection code.
Solution Approach 2:
The patent changes the voltage range parameter for error detection signaling, using a smaller voltage range compared to data signaling. This parameter change reduces the electromagnetic field strength generated by error detection signals, thereby minimizing interference with incoming data signals while maintaining the reliability function of error detection.
Data Source
AI summary
Methods, systems, and devices for channel modulation for a memory device are described. A system may include a memory device and a host device coupled with the memory device. The system may be configured to communicate a first signal modulated using a first modulation scheme and communicate a second signal that is based on the first signal and that is modulated using a second modulation scheme. The first modulation scheme may include a first quantity of voltage levels that span a first range of voltages, and the second modulation scheme may include a second quantity of voltage levels that span a second range of voltages different than (e.g., smaller than) the first range of voltages. The first signal may include write data carried over a data channel, and the second signal may include error detection information based on the write data that is carried over an error detection channel.