Design and implementation of a mixed SoC for IF digital software radio receiver

This paper presents a novel scheme for IF digital software radio receiver application, which integrates a high performance A/D converter and high-speed digital down converter (DDC) block into a SoC (system on chip) based on 32-bit RISC CPU. The proposed design can transform intermediate frequency (IF) analog signal to baseband digital signal and realize the real-time baseband signal processing. The simulation results indicate that The SFDR of ADC can achieve 88dB, and the SFDR of the DDC can reach to 70.59dBFS. The synthesized results of digital parts for the proposed SoC architecture on 0.18um CMOS technology reveals a maximum clock frequency of 116MHz and a total area of digital parts is 5.662mm², and the corresponding power consumption is below 150 mW. The ADC can reach to 250MSPS, whose power consumption is 263.6mW. The test results illuminates that the chip can work well. This design will have a good potential for wireless communication applications.