Multi-Channel ADC Clock Phase Calibration for Time Skew Alignment
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Solution Overview
Problem
Ensuring synchronization and reducing latency between multiple ADC channels in integrated circuits is challenging due to phase mismatches caused by clock signal variations, leading to inaccurate signal analysis.
Innovation Solution
An integrated circuit with phase detection circuits and clock phase adjustment circuits that calibrate ADC channels by using a test signal generator and derivative filters to align the phases of clock signals across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple ADC channels are used to process signals from multiple external sources, then the circuit's signal processing capability and versatility are improved, but phase mismatches and latency between channels occur due to clock signal variations
Solution Approach 1:
The patent implements a feedback mechanism where phase detection circuits continuously monitor phase differences between ADC channel outputs and generate phase difference signals. These signals are fed back to clock phase adjustment circuits that modify clock signal phases to eliminate detected phase differences, creating a closed-loop system that maintains synchronization accuracy across multiple ADC channels
Solution Approach 2:
The patent introduces phase detection circuits and clock phase adjustment circuits as intermediary components between the clock signal source and the ADC channels. These intermediaries detect phase mismatches and adjust clock signal phases accordingly, acting as mediators that ensure synchronized operation across multiple ADC channels without compromising their individual signal processing capabilities
2Measurement precision
If clock signal phases are manually adjusted to align ADC channels, then synchronization accuracy is improved, but the complexity and time required for calibration increase
Solution Approach 1:
The patent implements a self-calibrating system where the calibration circuits automatically detect phase differences between ADC channels and adjust their own operation to eliminate these differences. The phase detection circuits monitor outputs and generate correction signals that are automatically applied to clock signals, enabling the system to self-correct synchronization issues without external intervention or complex manual calibration procedures
Solution Approach 2:
The patent replaces manual mechanical adjustment mechanisms with electronic phase detection and automatic correction circuits. Instead of requiring physical intervention to align clock phases, the system uses electronic sensors to detect phase differences and electronic actuators to automatically adjust clock signal phases, significantly reducing calibration complexity and time while maintaining high precision
3Measurement precision
If calibration is performed slowly to ensure accuracy, then phase alignment precision is improved, but the calibration time and productivity are reduced
Solution Approach 1:
The patent implements continuous phase calibration rather than periodic or manual calibration. The phase detection circuits continuously monitor phase differences between ADC channels, and the clock phase adjustment circuits continuously adjust clock signal phases to maintain alignment. This continuous calibration process ensures high precision while minimizing calibration time, as the system adapts in real-time without requiring extended calibration periods
Data Source
AI summary
An integrated circuit includes a plurality of ADC channels. During a calibration process of the ADC channels, the integrated circuit utilizes derivative filters to calculate a phase difference between the ADC channels. During a calibration process, the integrated circuit utilizes clock phase alignment circuits to align the phases of the ADC channels based on the outputs of the derivative filters.