13 November 2014 Theoretical analysis on the sampling criteria for time-interleaved photonic analog-to-digital converters
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Abstract
Time-interleaved photonic analog-to-digital converter (TIPADC) is a promising candidate to process ultra-wideband signals. In a TIPADC, quantization is electrical in order to obtain large effective number of bits (ENOB). In this paper, we study the issues on the signal sampling and reconstruction in the TIPADC from the systematic point of view. The sampling output and frequency response of the system are derived using a model that includes the photonic sampling, demultiplexing, photo detecting, electronic quantizing and digital processing. The signal sampling and reconstruction mechanism of TIPADC with a uniform system sampling rate and matched channels are illuminated with the spectrum of signal in each processing step. The effect of the sampling pulse and back-end electronics on the system frequency response is analyzed in detail. The feasible regions of the system for alias-free sampling in terms of system frequency response, and a set of sampling criteria on bandwidth of the sampling pulse and back-end electronics are presented for the TIPADC. We find that the analog bandwidth of TIPADC can be much higher than the bandwidth of back-end electronics due to the weighted summing introduced by the multichannel time-interleaved photonic sampling. The proposed model and sampling criteria are validated by simulations under different parameter configurations.
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Jianping Chen, Feiran Su, Guiling Wu, "Theoretical analysis on the sampling criteria for time-interleaved photonic analog-to-digital converters", Proc. SPIE 9279, Real-time Photonic Measurements, Data Management, and Processing, 927907 (13 November 2014); doi: 10.1117/12.2072440; https://doi.org/10.1117/12.2072440
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