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114417

FEEDFORWARD COMPENSATION TECHNIQUE FOR COMPARATOR DELAY DISPERSION FOR LEVEL-CROSSING ADCS

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Electrical Engineering, Computer Engineering and Electrical power and machines engineering.

Abstract

The accuracy of measuring the crossing moment of a given signal to a specific reference voltage plays a crucial role in determining the bandwidth of the signal that could be converted by a level-crossing ADC. This timing accuracy is mainly determined by delay dispersion of the comparator and the accuracy of the time-to-digital converter (TDC) comprising the level-crossing ADC. With the pico-second resolution TDC, the delay dispersion of the comparator became the bottle nick of the design of a high speed level-crossing ADC. This paper presents a comparator with low delay dispersion for level-crossing analog-to-digital conversion applications. The comparator comprises a technique to compensate the delay dispersion caused by variable input overdrive. The whole circuit is composed of three main blocks, namely, conventional comparator, fixed delay block and variable delay block. The variable delay block is controlled such that it implements the inverse overdrive-delay characteristics of the conventional comparator. Therefore, the overall delay dispersion of the circuit is effectively reduced. Using the proposed technique in a level-crossing ADC would enable the sampling of a signal with 6.15X higher frequency than the case of using a conventional comparator keeping the same SNR.

DOI

10.21608/jesaun.2012.114417

Authors

First Name

Mohamed

Last Name

Abbas

MiddleName

-

Affiliation

Department of Electrical & Electronics Eng., Faculty of Eng., Assiut University, Egypt

Email

m-abbas@aun.edu.eg

City

-

Orcid

-

Volume

40

Article Issue

No 3

Related Issue

16850

Issue Date

2012-05-01

Receive Date

2012-02-14

Publish Date

2012-05-01

Page Start

877

Page End

884

Print ISSN

1687-0530

Online ISSN

2356-8550

Article File

JESAUN_Volume 40_Issue No 3_Pages 877-884.pdf

PDF . 157.2kB

Link

https://jesaun.journals.ekb.eg/article_114417.html

Detail API

https://jesaun.journals.ekb.eg/service?article_code=114417

Order

16

Type

Research Paper

Type Code

1,438

Publication Type

Journal

Publication Title

JES. Journal of Engineering Sciences

Publication Link

https://jesaun.journals.ekb.eg/

MainTitle

FEEDFORWARD COMPENSATION TECHNIQUE FOR COMPARATOR DELAY DISPERSION FOR LEVEL-CROSSING ADCS

Details

Type

Article

Created At

23 Jan 2023