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Digital background correction method applicable to pipelined analog-to-digital converter

An analog-to-digital converter and pipeline technology, which is applied in the direction of analog/digital conversion calibration/testing, etc., can solve the problems of harmonic distortion of capacitor operational amplifiers, and achieve the effect of high error estimation accuracy, short convergence time, and improved performance.

Inactive Publication Date: 2012-10-10
HEFEI UNIV OF TECH
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Problems solved by technology

[0012] The purpose of the present invention is to provide a digital background correction method suitable for pipelined analog-to-digital converters to solve the problems of capacitance mismatch and operational amplifier harmonic distortion in pipelined analog-to-digital converters

Method used

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  • Digital background correction method applicable to pipelined analog-to-digital converter
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  • Digital background correction method applicable to pipelined analog-to-digital converter

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specific Embodiment

[0027] In a specific embodiment, according to the requirement of the highest harmonic coefficient of the operational amplifier to be extracted, the number of pseudo-random quantities added to the sampling capacitor must be equal to the order of the highest harmonic. In this way, according to the correlation operation, the coefficient of the highest harmonic can be obtained, and the coefficient of the lower harmonic can also be obtained according to the corresponding convergence value. For the extraction of sampling capacitor mismatch information, as long as one of the capacitors injected with a random amount is tracked, the mismatch information of the sampling capacitor can be obtained. In order to extract all sampling capacitor mismatch information, the tracking sampling capacitor must be constantly changed. , that is, the sampling capacitor has a rotation process.

[0028] According to the idea of ​​adding a pseudo-random quantity to the sampling capacitor, the information e...

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Abstract

The invention discloses a digital background correction method applicable to a pipelined analog-to-digital converter; by adding pseudorandom quantity, the information of sampling capacitance mismatch and harmonic coefficients of an operation amplifier can be obtained to further correct the main output of the pipelined analog-to-digital converter. The method has the advantages of short convergence time and high error estimation precision, and the performance of the analog-to-digital converter is greatly improved.

Description

technical field [0001] The invention relates to the field of analog-to-digital converters, in particular to a digital background correction method suitable for pipelined analog-to-digital converters. Background technique [0002] An analog-to-digital converter is a component that converts an analog signal into a digital signal. Analog-to-digital converters are divided into Nyquist-rate ADCs and oversampling-rate ADCs. Nyquist rate analog-to-digital converters include successive approximation registers (successive approximation register, SAR ADC), all-parallel flash analog-to-digital converters (flash ADC), pipelined analog-to-digital converters (pipelined ADC) )Wait. Among various analog-to-digital converters, the structure of the all-parallel flash ADC is the simplest and the fastest. The input analog signal passes through a series of comparators whose threshold voltage is divided by a series of resistors. Digital codes are available. Its analog-to-digital conversion on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 张章吴楚彬於昌虎杨依忠解光军
Owner HEFEI UNIV OF TECH
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