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 and clock phase adjustment circuits that calibrate ADC channels by using a test signal generator, phase detection circuits, and clock phase adjustment circuits to align the phases of ADC channels with a reference channel, employing derivative filters to calculate phase differences and adjust clock signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ADC channels are used to process analog signals from different sources, then the circuit can handle multiple signals simultaneously, but phase mismatches and latency between channels occur leading to synchronization issues
Solution Approach 1:
The patent implements a feedback mechanism where the output of each ADC channel is fed back to a phase detection circuit. The phase detector compares the phase of each channel with a reference channel and generates a phase difference signal. This feedback loop enables continuous monitoring and correction of phase mismatches, ensuring synchronization across all ADC channels while maintaining high signal processing capacity.
Solution Approach 2:
The patent introduces a phase detection circuit and clock phase adjustment circuit as intermediary components between the ADC channels. These intermediary circuits measure phase differences and generate correction signals that adjust the clock phases of individual ADC channels, thereby mediating the synchronization issue without affecting the overall multi-channel signal processing capability.
2Loss of time
If clock signal phase is adjusted to align ADC channels, then latency between channels is reduced, but additional calibration circuits and processes are required
Solution Approach 1:
The patent performs phase calibration in advance during the manufacturing or initialization process. The calibration circuit measures phase differences between ADC channels using test signals and pre-adjusts the clock signal phases to compensate for latency. This preliminary action eliminates the need for continuous complex calibration during operation, reducing both latency and operational complexity.
Solution Approach 2:
The patent adjusts the phase parameter of clock signals provided to each ADC channel based on measured phase differences. By changing the phase parameter of the clock signals, the system aligns the timing of different ADC channels, reducing latency between channels while using a relatively simple phase adjustment mechanism rather than complex circuit modifications.
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.