Asynchronous SAR ADC Delay Calibration for PVT Timing Drift
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Solution Overview
Problem
Existing SAR ADCs face challenges in maintaining ultra-high-speed conversion with low energy consumption due to fluctuations in process, voltage, and temperature (PVT) parameters, leading to inaccurate bit quantization and performance variability.
Innovation Solution
A delay calibration circuit is integrated into the SAR ADC to monitor conversion times and adjust delay durations based on timing information, ensuring robust operation across varying PVT conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sampling rate is increased to achieve ultra-high-speed conversion, then the conversion speed is improved, but the energy consumption increases and timing accuracy deteriorates due to PVT fluctuations
Solution Approach 1:
The patent applies preliminary action by pre-calibrating delay values for different PVT conditions before actual conversion operations. The system stores multiple sets of delay calibration values corresponding to different process, voltage, and temperature conditions, and selects the appropriate calibration values in advance based on detected PVT conditions, thereby ensuring timing accuracy without compromising conversion speed.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting delay calibration values based on detected PVT conditions. When PVT parameters fluctuate, the system changes the delay parameters to compensate for timing variations, maintaining accurate bit quantization across different operating conditions while preserving high conversion speeds.
2Reliability
If delay calibration is implemented to improve timing accuracy, then the robustness is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the delay calibration into multiple independent stages, each corresponding to different bit quantization processes. The delay calibration circuit is segmented into several adjustable delay elements that can be independently configured, allowing precise control of timing for each bit without requiring a complete redesign of the entire conversion system.
Solution Approach 2:
The patent implements self-service through an automatic delay calibration mechanism that detects PVT conditions and autonomously selects appropriate delay calibration values without requiring external intervention. The system monitors its own operating conditions and adjusts timing parameters automatically, reducing the need for complex external calibration equipment or manual adjustment mechanisms.
Data Source
AI summary
A delay calibration circuit and method, an analog-to-digital converter, a radar sensor, and a device are provided. The delay calibration circuit monitors a timing relationship between signals in a chip in real time to extract PVT information, dynamically adjusts conversion timing of an asynchronous SAR ADC, maximally utilizes an available conversion time in each cycle of the asynchronous SAR ADC, improves the robustness of the asynchronous SAR ADC, and does not affect the normal operation of the asynchronous SAR ADC.