Adaptive sigma delta ADC for WiMAX fixed point wireless applications

The increasing demand for wireless broadband connection emerged in worldwide interoperability microwave access (WiMAX) system which is revolutionizing the broadband wireless world by providing it with a specific standard and ensures the inter-operability among different providers. WiMAX systems support different signal bandwidths (1.25 MHz-20 MHz) and different modulation schemes (BPSK to 64 QAM). For such a multi-mode system, a sigma delta ADC is proposed that provides variable requirements of WiMAX. The sigma delta ADC uses an innovative technique called adaptive line enhancer (ALE) to boost the performance of the analog to digital conversion in the digital post-processing section of the sigma delta ADC