Multi-channel ADC high-precision calibration system and method

By combining analog and digital domain calibration systems and utilizing cross-correlation operations and parameter estimation algorithms, the problems of insufficient accuracy and high complexity in multi-channel ADC systems are solved. This achieves high-precision, low-complexity calibration, adapts to temperature drift and device aging, and ensures signal quality.

CN120856166AActive Publication Date: 2025-10-28SHANGHAI WU QI MICROELECTRONICS CO LTD +1
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Patent Information

Application Number
CN202511052136.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-29
Publication Date
2025-10-28
Estimated Expiration
2045-07-29

AI Technical Summary

Technical Problem

In existing multi-channel ADC systems, the analog self-test system has insufficient accuracy and low reliability, the digital domain adaptive algorithm has high hardware complexity, and the statistical algorithm has a long estimation cycle and may block business operations.

Method used

A calibration system combining analog and digital domains is adopted. The calibration signal is generated by a digital transmitter, the correlation module is used to perform cross-correlation operations, the parameter estimation module calculates the deviation parameters, and the compensation module performs amplitude and time deviation compensation to achieve high-precision calibration.

Benefits of technology

It achieves high-precision, low-complexity calibration with high stability and short estimation cycle, does not affect normal business operations, and adapts to temperature drift and device aging.

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Abstract

The invention provides a multi-channel ADC high-precision calibration system and method, and relates to the technical field of communication, and the system comprises a digital transmitter, a DAC module, a calibration loop and a multi-channel ADC module which are connected in sequence, and also comprises a correlation module, a parameter estimation module and a compensation module. The correlation module is respectively connected with the digital transmitter and the multi-channel ADC module, the parameter estimation module is respectively connected with the correlation module and the compensation module, and the compensation module is further connected with the multi-channel ADC module; and the calibration loop is used for connecting the tail end of the transmitting link and the front end of the receiving link. According to the method, the analog domain and the digital domain are combined through the calibration loop, deviation compensation can be achieved by conducting single cross-correlation operation and parameter estimation on the local reference signal and the multiple sub-signals, the mode does not need to redesign an analog circuit and does not depend on an external instrument for calibration, hardware complexity is low, stability is high, the estimation period is short, and cost is low. And normal business operation is not influenced.
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