Semiconductor Data Reception Circuit with Dynamic Reference Potential
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Solution Overview
Problem
Semiconductor devices face issues with correctly receiving data signals due to changes in temperature or power supply voltage, which narrow the effective window width of the data signal DQ, potentially leading to incorrect data reception.
Innovation Solution
A control circuit adjusts a reference potential through initial training, storing it in a reference potential storage unit and updating it based on intermediate potentials of differential data strobe signals during both initial training and data reading, ensuring accurate data signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the semiconductor device operates at higher speed, then productivity is improved, but the effective window width of the data signal becomes narrower causing incorrect data reception
Solution Approach 1:
The reference potential is made dynamic by updating it based on the intermediate potential of differential data strobe signals during both initial training and data reading operations. This allows the reference potential to adapt to changing operating conditions while maintaining high-speed operation and reliable data reception
Solution Approach 2:
The patent changes the reference potential parameter based on measured intermediate potentials from differential data strobe signals. By adjusting this critical parameter during operation, the system maintains optimal data reception windows even at high speeds where temperature and voltage variations occur
2Adaptability or versatility
If temperature or power supply voltage changes, then device operation continues, but the effective window width of the data signal narrows potentially leading to incorrect reception
Solution Approach 1:
The system implements feedback by measuring the intermediate potential of differential data strobe signals and using this information to update the reference potential. This closed-loop approach compensates for temperature and voltage variations, maintaining reliable data reception across varying operating conditions
Solution Approach 2:
The reference potential parameter is dynamically adjusted based on environmental variations. By changing this parameter in response to temperature and voltage changes, the system maintains adaptability while preventing data reception errors
3Device complexity
If the reference potential is fixed after initial training, then device complexity is reduced, but the data signal window width cannot be maintained under varying conditions
Solution Approach 1:
Rather than using a fixed reference potential, the system dynamically updates the reference potential during data reading operations. This adds some complexity but ensures reliable data reception by adapting to actual operating conditions
Solution Approach 2:
The system performs self-adjustment by automatically updating its own reference potential based on measurements taken during normal data reading operations. This self-service mechanism maintains reliability without requiring external calibration
Data Source
AI summary
A data signal reception circuit output a binary level data signal by comparing the data signal with a reference potential in a reference potential storage unit. A data strobe signal reception circuit outputs a binary level data strobe signal by comparing one and the other of differential data strobe signals. A control circuit adjusts the reference potential by initial training, causes the reference potential storage unit to store the adjusted reference potential, and updates the reference potential in the reference potential storage unit based on an intermediate potential between one and the other of the differential data strobe signals at a time of the initial training and an intermediate potential between one and the other of the differential data strobe signals at a time of data reading.