Title :
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
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;
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
DOI :
10.1109/ICECS.2011.6122257
