DocumentCode :
1410621
Title :
Bit-Resolution Improvement of an Optically Sampled Time-Interleaved Analog-to-Digital Converter Based on Data Averaging
Author :
Villa-Angulo, Carlos ; Hernández-Fuentes, Ivan Olaf ; Villa-Angulo, Rafael ; Donkor, Eric
Author_Institution :
Inst. of Eng., Univ. of Baja California, Mexicali, Mexico
Volume :
61
Issue :
4
fYear :
2012
fDate :
4/1/2012 12:00:00 AM
Firstpage :
1099
Lastpage :
1104
Abstract :
In this paper, we present an experimental method demonstrating an improvement in the resolution of optically sampled time-interleaved analog-to-digital converters (ADCs) by applying a data averaging technique. We implemented two experiments for oversampling four times the bandwidth of an analog input signal using a multichannel time-interleaved arrangement. The sampling rate for each experiment was 2.08 gigasamples per second. In the first experiment, the optically sampled signal of each channel is digitized by a single ADC, whereas in the second, the signal is simultaneously digitized by four ADCs, and thereafter, the four digitized samples are averaged. A 20-dBm white-noise signal was superimposed on the input analog signal to test the implemented ADC systems. An improvement in the signal-to-noise-and-distortion ratio from 55.58 to 61.44 dB was achieved with averaging. Likewise, an improvement in the effective number of bits from 8.94 to 9.91 was achieved with averaging.
Keywords :
analogue-digital conversion; data handling; bit resolution improvement; data averaging; digitized channel; multichannel time interleaved arrangement; optically sampled time interleaved analog-to-digital converter; signal-to-noise-and-distortion ratio; Adaptive optics; Optical coupling; Optical feedback; Optical pulses; Optical saturation; White noise; Data averaging; optically sampled signal; resolution improvement; time-interleaved analog-to-digital converters (ADCs);
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.2011.2179335
Filename :
6117085
Link To Document :
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