TIADC time error mismatch self-adaption blind correction method based on differentiator and average time error

Abstract

A TIADC(Time Interleaved Analog-to-digital Converter) time error mismatch self-adaption blind correction method based on differentiator and average time error belongs to the field of analog digital conversion. According to the invention, slope approximation and the average value of time errors of all slave ADCs of the TIADC are utilized for deducing a system unknown parameter to be estimated. The TIADC system is adopted for sampling output values practically, the differentiator and a high-pass filter are utilized, a certain degree of oversampling is required and a minimum mean squared error algorithm is utilized for realizing the self-adaption blind correction of the time error mismatch of the TIADC system. The to-be-estimated parameter of the correction system is a difference value between the relative time error of each slave ADC and the average value of the relative time error of all the slave ADCs. The parameter is used for error reconstruction and system compensation. By adopting the method provided by the invention, hardware complexity, hardware implementation difficulty and system power consumption are reduced effectively. The method can be applied to multiple channels. The more the channel number is, the more obvious the advantage of the method becomes.

Description

technical field [0001] The invention relates to an adaptive blind correction method for time error mismatch of a TIADC (Time-Interleaved Analog-to-digital Converter, time-alternating analog-to-digital converter) based on a differentiator and an average time error, belonging to high-speed and high-precision analog-to-digital conversion technology field. Background technique [0002] The TIADC system composed of multiple relatively low-speed and high-precision single ADCs with a parallel time-alternating sampling structure has become the development direction of high-speed, high-precision ADCs. However, in practical applications, the error mismatch (time error mismatch, gain error mismatch and offset error mismatch) between sub-ADCs in the TIADC system caused by factors such as manufacturing process will seriously affect the overall TIADC performance. Among them, the gain error mismatch and offset error mismatch are relatively easy to deal with, while the time error mismatch...

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Problems solved by technology

The more the number of channels, the more complex the correction structure and the greater the power consumption, the more difficult it is to realize

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