Extending the dynamic range of a photonic RSNS ADC using a segmentation approach
Pace, Phillip E.
Jenn, David C.
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The trend in high-performance digital receivers is to configure the analog-to-digital converter (ADC) directly after the antenna and low noise amplifier. Direct digitization of wideband antenna signals can be realized using Mach-Zehnder interferometers (MZI) to efficiently fold the RF signal into the optical domain. The robust symmetrical number system (RSNS) is a modular scheme formed using N ? 2 integer sequences and insures that any two successive vectors or paired terms from all N sequences differ by only one integer (integer Gray code property). A photonic ADC preprocessing architecture using the RSNS uses a modulus i m number of comparators at the output of each MZI/photodetector. The total number of comparators with a logic ?1? in each channel represents the integer values within each RSNS sequence. The dynamic range
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