Networking and Communication Engineering

Jihene Mallek ¹, Hassene Mnif ², Mourad Loulou ¹

Affiliations
1 Laboratory of Electronics and Information Technologies, University of Sfax, TN
2 Electronic and Communication Institute, University of Sfax, TN

Abstract

In this paper, we present the studying and sizing of the homodyne receiver, especially the flexible sigma delta ADC intended for use in the WiMAX standard, which is characterized by its multi-band and multi-mode aspects, for 5MHz, 7MHz or 10MHz channel bandwidth. Our design technique aims keep proper ADC architecture in response to multi-mode and multi-band aspects of WiMAX standard. For this, we set each sampling frequency corresponding to each channel bandwidth, so that we will keep the same OSR value for different channel bandwidth. In addition, we use the pole placement method to calculate and analyze the noise shaping transfer function of continuous-time sigma-delta ADC, according to the loop gain variation. For such specifications, a flexible fourth-order CT ΣΔ ADC, with a mono-bit quantizer, is presented and its simulation results are shown by using Matlab Simulink. Over a 5MHz, 7MHz and 10MHz channel bandwidth, the ADC achieves respectively 78.19dB, 74.61dB and 73.64dB SNR values, and respectively 80.5dB, 75.39dB and 74.852dB dynamic range.

Keywords

Analog-to-Digital Conversion, Sizing, Continuous Time ΣΔ ADC, Wimax, Flexible ADC.

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