Paper Info
Title
Sensitivity analysis of pulse-width jitter induced noise in continuous-time delta-sigma modulators to out-of-band blockers in wireless receivers
Abstract
This paper investigates the sensitivity of continuous-time (CT) delta-sigma analog-to-digital converters (ADCs), candidate architectures for multi-standard and software-defined radio receivers, to feedback pulse-width jitter (PWJ) in presence of blocker signals received at the ADC input. A comparison between delta-sigma modulators with feedforward (FF) and feedback (FB) loop filter structures in terms of robustness to digital-to-analog converter (DAC) PWJ, in presence of blockers, is performed. Analysis and discussions developed in the paper are verified by CT simulations in Matlab/Simulink® and simulations results show good agreement with the theoretical expectations. It is shown that the PWJ induced errors due to out-of-band (OOB) blockers in the feedback path dominate the total in-band noise power (IBN) in FF delta-sigma structures and can cause a reduction in the achievable dynamic range that can be as large as 12 dB (2 bits of resolution) in case of using a non-return-to-zero DAC waveform. On the other hand, for same blocker levels at the modulator input, PWJ induced errors caused by OOB blockers have negligible contribution to the IBN in FB structures, owing to their stronger low-pass filtering characteristic and hence higher attenuation of OOB blockers.
Year
DOI
Venue
2011
10.1109/ISCAS.2011.5937893
Circuits and Systems
Keywords
Field
DocType
circuit feedback,continuous time filters,delta-sigma modulation,jitter,low-pass filters,radio receivers,software radio,CT delta-sigma ADC,Matlab/Simulink,analog-to-digital converters,blocker signals,continuous-time delta-sigma modulator,continuous-time simulation,digital-to-analog converter,feedback loop filter structures,feedforward loop filter structures,in-band noise power,low-pass filtering,multistandard radio receivers,nonreturn-to-zero DAC waveform,out-of-band blockers,pulse-width jitter induced noise,sensitivity analysis,software-defined radio receivers,wireless receivers
Noise power,Dynamic range,Computer science,Control theory,Delta-sigma modulation,Electronic engineering,Low-pass filter,Digital-to-analog converter,Frequency modulation,Jitter,Feed forward
Conference
ISSN
ISBN
Citations 
0271-4302 E-ISBN : 978-1-4244-9472-9
978-1-4244-9472-9
2
PageRank 
References 
Authors
0.40
2
2
Name
Order
Citations
PageRank
ramy a saad1181.98
Sebastian Hoyos223429.24