A Compressed Sampling Analog-to-Digital Converter Error Calibration Method

Abstract

The invention relates to an error calibration method of a compression sampling analog-to-digital converter and belongs to the field of mixing signal integrated circuit designs. For inevitable non-ideal factors and effects on following signal recovery in circuit realization in a compression sampling analog-to-digital converter, the invention puts forwards an idea of adding error estimation and signal calibration on the basis of a traditional signal processing process and provides a signal processing process including signal observation, error estimation, signal calibration and signal recovery. Different error models can be set according to different structures; hardware errors are estimated; hardware observation signals are calibrated; and then the calibrated signals are sent to a recovery module. Thus, performance degradation caused by the non-ideal factors in the compression sampling analog-to-digital converter can be effectively eliminated; and sampling signals are calibrated before the recovery, recovery effects of the signals can be improved and a better system realization effect can be achieved.

Description

technical field [0001] The invention relates to a compression sampling analog-to-digital converter error calibration method, which belongs to the technical field of mixed-signal integrated circuit design. Background technique [0002] The basic idea of ​​an analog-to-digital converter (Analog-to-Digital Converter, hereinafter referred to as ADC) is to quantize a continuous analog signal within a certain range through the steps of sampling, holding, quantizing, and encoding in a specific way, and the quantized The result is represented by a set of specific digital codes, and it is used as the input signal of the digital processing system. The traditional analog-to-digital converter is limited by the Nyquist sampling theorem, and the signal must be sampled at a frequency higher than twice the processing signal bandwidth. High requirements, subject to factors such as technology, the speed and accuracy of the current quantizer cannot match the information requirements processed...

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Problems solved by technology

[0009] The purpose of the present invention is to propose a method for calibrating errors of compressed sampling analog-to-digital converters. The problem is that in the hardware implementation of compressed sampling analog-to-digital converters, quantization errors will be introduced due to the existence of quantizers, and there will be capacitance loss at the same time. configuration, process deviation, system noise, etc. If the traditional restoration algorithm is used without considering the many errors caused by the hardware implementation, the restoration effect will deteriorate and the accuracy and other indicators of the entire system will be reduced. Considering hardware factors, the application of this Invented error calibration method can effectively improve system performance

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