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digital filter for sigma delta ADC.pptx

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sigmal delta ADC 滤波器设计指南。音频和测量的应用的区别。滤波器原理，深入浅出的，容易理解。对于ADC开发者来说是提升基础知识和理解的有很大帮助。 sigmal delta ADC 滤波器设计指南。音频和测量的应用的区别。滤波器原理，深入浅出的，容易理解。对于ADC开发者来说是提升基础知识和理解的有很大帮助。属于基础的概念理解范畴。图表详细，可以看到深层次的区别

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Digital lter for sigma

Delta ADC

Background

•

This applicaon report discusses digital lters which are a ubiquitous

feature in delta-sigma analog to digital converters (ADCs). Digital low-

pass lters are essenal to the funconality of a delta-sigma ADC,

which relies on oversampling and noise shaping to push quanzaon

noise out of band. There are variaons between the types of digital

lters used in delta-sigma ADCs that provide various benets and

drawbacks that orient them to di%erent applicaons. The types of

lters and the tradeo%s between them are discussed in this report.

intruduction

•

Delta-sigma analog-to-digital converters (ADCs) are di%erent from

other types of data converters in that they typically integrate digital

lters. The digital lter is crucial to how delta-sigma ADCs are able to

obtain ne resoluon across a variety of bandwidths. This applicaon

report discusses the movaon for including a digital lter in delta-

sigma ADCs, the di%erent types of digital lters, and the tradeo%s that

exist between the various types of digital lters as they relate to

di%erent applicaons.

•

To understand why the digital lter is an important aspect in delta-

sigma analog-to-digital conversion, it is crical to have a basic

understanding of a delta-sigma modulator. The modulator takes its

input from a sample-and-hold circuit which will sample the ADC input

at a rate (fMOD) many mes faster than the ADC output data rate

(fDR)

Module principle

•

The modulator consists of at least one integrator and a low-resoluon

ADC which quanzes the integrator output voltage into just a few bits.

The modulator converts the result of the low-resoluon ADC back to

analog and feeds it back to the modulator input where it is subtracted

from the input voltage as a means of error correcon. The result is a

discrete-me feedback system which allows sampled input signals to

pass at unity gain, but will shape quanzaon noise density to be

lower at low frequency and higher at high frequency.

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