Receiver Reference Voltage Correction for Temperature Drift
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Solution Overview
Problem
In semiconductor integrated circuits, the variation of ambient temperature and power supply voltage affects the output amplitude, leading to difficulties in calibrating reference voltages, which results in erroneous data value determination and increased bit error rates during wired communication.
Innovation Solution
A semiconductor integrated circuit is designed with an amplifier circuit, generation circuits, and correction circuits that dynamically adjust threshold voltages based on temperature and power supply voltage characteristics, using a common mode voltage and DA converters to maintain constant output with respect to temperature and power supply variations, ensuring accurate data value identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference voltages are calibrated using fixed values, then the circuit design is simple, but temperature and power supply voltage variations cause erroneous data determination and increased bit error rates
Solution Approach 1:
The patent implements feedback mechanisms where detection circuits continuously monitor temperature and power supply voltage, and correction circuits dynamically adjust reference voltages based on these monitored parameters. This closed-loop feedback system ensures that reference voltages are automatically corrected to compensate for environmental variations, thereby maintaining data determination accuracy without requiring complex manual calibration procedures
Solution Approach 2:
The system performs self-correction of reference voltages by using internally generated temperature and power supply voltage information. The correction circuits automatically adjust the reference voltages based on detected variations, enabling the system to self-compensate for environmental effects without external intervention, thus improving reliability while keeping the overall system architecture relatively simple
2Measurement precision
If dynamic temperature and power supply compensation is implemented, then data determination accuracy is maintained, but the circuit complexity increases due to additional correction circuits
Solution Approach 1:
The patent divides the compensation function into separate specialized circuits: temperature detection circuits, power supply voltage detection circuits, temperature correction circuits, and power supply voltage correction circuits. Each circuit is designed to perform a specific function, making the overall complex system manageable through functional segmentation. This modular approach allows for precise measurement and correction while maintaining clear circuit boundaries and simplifying analysis
Solution Approach 2:
The system dynamically changes the parameters of reference voltages based on detected temperature and power supply voltage conditions. By adjusting the reference voltage values in response to parameter variations, the system maintains measurement precision without requiring fundamentally new circuit architectures. The correction circuits modify existing reference voltage parameters rather than introducing entirely new measurement mechanisms
Data Source
AI summary
In a semiconductor integrated circuit, a first generation circuit generates a common mode voltage of a differential signal. A second generation circuit generates temperature information according to the common mode voltage. The temperature information is information corresponding to a characteristic of an amplifier circuit related to an ambient temperature. A correction circuit corrects a first reference voltage and a second reference voltage according to the temperature information. A comparator includes a first input node to which a first signal line is electrically connected; a second input node to which a second signal line is electrically connected; a third input node to which the corrected first reference voltage is input; and a fourth input node to which the corrected second reference voltage is input.