Time-Interleaved ADC Calibration for Adaptive Sampling Sequence
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Solution Overview
Problem
Existing time-interleaved analog-to-digital converters face performance degradation due to phase errors in clock signals and manufacturing mismatches, leading to increased circuit area and power consumption, especially as the number of channels increases, making fixed sampling sequences unsuitable.
Innovation Solution
A time-interleaved analog-to-digital converter with a calibration circuitry that adjusts the sampling sequence by testing different clock signal phases during an initial period and selecting the optimal sequence for improved performance, thereby reducing the need for additional phase error correction circuits and accommodating manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed sampling sequence is used in time-interleaved ADC, then the circuit structure is simple, but phase errors in clock signals cause inaccurate sampling and performance degradation
Solution Approach 1:
The patent implements a dynamic sampling sequence adjustment mechanism where the calibration circuitry determines optimal sampling sequences based on actual circuit performance and manufacturing variations. The system transitions from a static fixed sequence to a dynamic adaptive sequence that optimizes sampling accuracy while maintaining circuit simplicity.
Solution Approach 2:
The patent changes the sampling sequence parameters dynamically based on calibration results. The calibration circuitry measures performance metrics and adjusts the sampling sequence parameters to compensate for phase errors and manufacturing mismatches, thereby improving sampling accuracy without adding complex correction circuits.
2Measurement precision
If additional phase error correction circuits are added to correct clock signals, then sampling accuracy is improved, but circuit area and power consumption increase
Solution Approach 1:
The calibration circuitry performs self-calibration by measuring the actual performance of the time-interleaved ADC and automatically adjusting the sampling sequence to compensate for phase errors. This self-service approach eliminates the need for external complex phase correction circuits, reducing circuit area and power consumption while maintaining high sampling accuracy.
Solution Approach 2:
The system implements a feedback mechanism where the calibration circuitry continuously monitors sampling performance and adjusts the sampling sequence accordingly. This closed-loop feedback approach enables accurate compensation for phase errors without requiring additional open-loop correction circuits, thereby minimizing circuit area and power consumption.
3Measurement precision
If additional phase error correction circuits are added to correct clock signals, then sampling accuracy is improved, but power consumption increases
Solution Approach 1:
The calibration circuitry performs self-calibration by measuring the actual performance of the time-interleaved ADC and automatically adjusting the sampling sequence to compensate for phase errors. This self-service approach eliminates the need for external complex phase correction circuits, reducing circuit area and power consumption while maintaining high sampling accuracy.
Solution Approach 2:
The system implements a feedback mechanism where the calibration circuitry continuously monitors sampling performance and adjusts the sampling sequence accordingly. This closed-loop feedback approach enables accurate compensation for phase errors without requiring additional open-loop correction circuits, thereby minimizing circuit area and power consumption.
4Productivity
If the number of channels is increased, then conversion performance is improved, but mismatches caused by manufacturing variations increase, making fixed sampling sequences unsuitable
Solution Approach 1:
The patent implements a dynamic sampling sequence adjustment mechanism that adapts to manufacturing variations in multi-channel time-interleaved ADCs. The calibration circuitry determines optimal sampling sequences based on actual circuit performance, enabling the system to maintain high conversion performance across multiple channels despite process variations.
Solution Approach 2:
The patent changes the sampling sequence parameters dynamically based on calibration results for each channel. This parameter adaptation allows the system to compensate for manufacturing mismatches in multi-channel configurations, maintaining high conversion performance and signal integrity across all channels.
Data Source
AI summary
A time-interleaved analog-to-digital converter includes a plurality of channel circuitries, an output circuit, and a calibration circuitry. The plurality of channel circuitries are configured to sample an input signal to generate a plurality of first digital codes according to the input signal. The output circuit is configured to output a second digital code according to the plurality of first digital codes. The calibration circuitry is configured to adjust a sampling sequence of the plurality of channel circuitries for the input signal during an initial period, and control the plurality of channel circuitries to sample the input signal in the adjusted sampling sequence during an analog-to-digital conversion period.