High-pass or low-pass ΣΔ modulators?

Author

Jabbour, Chadi ; Khushk, Hasham Ahmed ; Nguyen, Van Tam ; Loumeau, Patrick

Author_Institution

LTCI, Inst. TELECOM-TELECOM ParisTech, Paris, France

fYear

2011

fDate

11-14 Dec. 2011

Firstpage

236

Lastpage

239

Abstract

In this paper, High-Pass (HP) ΣΔ modulators are compared to the traditional Low-Pass (LP) ΣΔ modulators. The objective of this comparison is to point out the advantages and drawbacks of the two modulators thereby allowing to choose the most suited for a given application. The metrics of comparison are the noise floor, power consumption, surface area and the effect of the non-idealities of all the basic blocks (i-e Operational Transconductance Amplifier (OTA), Quantizer, Switches and Clocks). It turns out that HP modulators are more suited for narrow band applications because of their immunity against DC-offset and flicker noise. For medium and wide band applications, LP modulators are preferred because of their higher robustness against switch imperfections and clock jitter.

Keywords

flicker noise; high-pass filters; jitter; sigma-delta modulation; thermal noise; DC offset; clock jitter; flicker noise; high-pass ΣΔ modulators; low-pass delta-sigma modulators; noise floor; operational transconductance amplifier; power consumption; surface area; Frequency modulation; Jitter; Noise; Strontium; Thermal noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems (ICECS), 2011 18th IEEE International Conference on

Conference_Location

Beirut

Print_ISBN

978-1-4577-1845-8

Electronic_ISBN

978-1-4577-1844-1

Type

conf

DOI

10.1109/ICECS.2011.6122257

Filename

6122257