Low-complexity N-port ADCs using 2-D Δ-Σ noise-shaping for N-element array receivers
| Autor: | Soumyajit Mandal, Ali Nikoofard, M. Twieg, Arjuna Madanayake, Suranga Handagala, Jifu Liang, Leo Belostotski |
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| Rok vydání: | 2017 |
| Předmět: |
Noise (signal processing)
020208 electrical & electronic engineering Array processing 020206 networking & telecommunications 02 engineering and technology Signal SINADR Noise shaping Effective number of bits Integrator 0202 electrical engineering electronic engineering information engineering Electronic engineering Oversampling Mathematics |
| Zdroj: | MWSCAS |
| DOI: | 10.1109/mwscas.2017.8052920 |
| Popis: | A novel multi-dimensional noise-shaping method is proposed to extend Δ-Σ modulation to the two-dimensional (2-D) (space, time) case. It uses spatial oversampling to provide another degree of freedom for ADC designers to shape quantization noise when temporal oversampling is limited. The method uses lossless discrete integrators (LDIs) to implement spatial integrators and is suitable for use in microwave and mm-wave array processing systems. The resulting 2-D noise shaping reduces the spectral overlap of a desired array signal with that of quantization noise. Shaped noise can then be removed from the region of support (ROS) of the array signal using 2-D filtering, thus improving the overall signal-to-quantization noise ratio (SQNR) and effective number of bits (ENOB). Simulation results from an integrated 64-channel converter in UMC 65nm CMOS prove the functionality of the approach. Experimental results from a board-level 64-channel converter are also presented. |
| Databáze: | OpenAIRE |
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