Self-Calibrating Digital Buffer for DDR Signal Timing Stability
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Solution Overview
Problem
Digital buffer devices in memory systems, such as DDR series memory technology, face challenges in maintaining signal quality due to process variations, which can lead to incorrect interpretation of signals by internal circuits, making it difficult and time-consuming for designers to guarantee signal quality.
Innovation Solution
A digital buffer device with self-calibration, comprising a first buffer circuit, a detection circuit, and a calibration circuit, which detects circuit characteristic variations and calibrates the buffer circuit to enhance output signal quality by using reference signals to generate detection signals and adjust the output signal accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional digital buffer circuits are used without calibration, then the device complexity is low, but the signal quality deteriorates due to process variations causing rising or falling edge derivations
Solution Approach 1:
The patent applies preliminary action by performing calibration before normal buffer operation. The detection circuit measures circuit characteristic variations (such as rising/falling edge timing) and stores calibration data. During operation, the calibration circuit uses this pre-stored data to adjust the buffer output, ensuring signal quality without adding real-time complexity.
Solution Approach 2:
The patent implements self-service through automatic calibration functionality. The detection circuit autonomously measures variations in buffer circuit characteristics, and the calibration circuit automatically adjusts timing parameters based on detected variations, eliminating the need for manual designer intervention and ensuring consistent signal quality across process variations.
2Reliability
If manual calibration by circuit designer is used, then signal quality can be improved, but the time consumption and manufacturing complexity increase significantly
Solution Approach 1:
The patent implements self-service through automatic calibration functionality. The detection circuit autonomously measures variations in buffer circuit characteristics, and the calibration circuit automatically adjusts timing parameters based on detected variations, eliminating the need for manual designer intervention and ensuring consistent signal quality across process variations.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting buffer circuit timing parameters (rising/falling edge delays) based on detected variations. The calibration circuit modifies these parameters automatically according to measurement results, allowing the system to adapt to process variations without manual reconfiguration or extended calibration time.
3Reliability
If buffer circuits are designed to guarantee signal quality under all process variations, then signal quality is maintained, but the design complexity and time consumption increase
Solution Approach 1:
The patent applies preliminary action by performing calibration before normal buffer operation. The detection circuit measures circuit characteristic variations (such as rising/falling edge timing) and stores calibration data. During operation, the calibration circuit uses this pre-stored data to adjust the buffer output, ensuring signal quality without adding real-time complexity.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting buffer circuit timing parameters (rising/falling edge delays) based on detected variations. The calibration circuit modifies these parameters automatically according to measurement results, allowing the system to adapt to process variations without manual reconfiguration or extended calibration time.
Data Source
AI summary
A digital buffer device with self-calibration includes a first buffer circuit, detection circuit, and calibration circuit. The first buffer circuit has a buffer input terminal for receiving an input signal and a buffer output terminal as output of the digital buffer device. The detection circuit includes at least one second buffer circuit for receiving at least one reference signal and generating at least one detection signal to indicate circuit characteristic variations of the at least one second buffer circuit. The at least one second buffer circuit is of a same type of buffer as the first buffer circuit. The calibration circuit has a calibration input terminal for receiving the input signal, and a calibration output terminal coupled to the buffer output terminal. The calibration circuit is for calibrating the first buffer circuit to generate an output signal according to the input signal and the at least one detection signal.