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http://dx.doi.org/10.5515/KJKIEES.2012.23.6.706

Performance and Jitter Effects Analysis of Single Bit Electro-Optical Sigma-Delta Modulators  

Nam, Chang-Ho (Agency for Defense Development)
Ra, Sung-Woong (Division of Electrical and Information Technology Engineering, Chungnam National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.6, 2012 , pp. 706-715 More about this Journal
Abstract
Electro-optical sigma-delta modulators are the core module of digital receiver to digitize wideband radio-frequency signals directly at an antenna. Electro-optical sigma-delta modulators use a pulsed laser to oversample an input radio-frequency signals at two Mach-Zehnder Interferometer(MZI) and shape the quantization noise using a fiber-lattice accumulator. Decimation filtering is applied to the quantizer output to construct the input signal with high resolution. The jitter affects greatly on reconstructing the original input signal of modulator. This paper analyzes the performance of first order single bit electro-optical sigma-delta modulator in the time domain and the frequency domain. The performance of modulator is analyzed by using asynchronous spectral averaging of the reconstructed signal's spectrum in the frequency domain. The reference value of time jitter is presented by analyzing the performance of jitter effects. This kind of jitter value can be used as a reference value on the design of modulators.
Keywords
Electro-Optical Sigma-Delta Modulator; Digital Receiver; Fiber-Lattice Accumulator; Mach-Zehnder Interferometer(MZI); Analog-to-Digital Converter;
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