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JSSC 2010第9期RF & Wireless65nm

Discrete-Time Mixing Receiver Architecture for RF-Sampling Software-Defined Radio

提出一种适用于软件定义无线电的离散时间混频接收器架构,实现宽带正交解调和谐波抑制。
增益0.5至2.5 dB,噪声系数18至20 dB,IIP3 10 dBm,IIP2 53 dBm,功耗<19 mW
离散时间混频软件定义无线电射频采样宽带解调谐波抑制
离散时间混频架构:提出了一种新型离散时间混频接收机架构,通过去复用技术实现宽带正交解调,支持0.2至0.9 GHz频段,8倍过采样,显著降低谐波干扰(2至6次谐波抑制达40 dB),系统功耗低于19 mW。
宽带正交解调技术:采用离散时间混频方法实现无系统带宽限制的I/Q输出90度相位差,支持软件定义无线电(SDR)的宽带信号处理需求,同时通过过采样降低噪声和干扰折叠效应。
谐波抑制技术:通过离散时间混频和过采样设计,有效抑制2至6次谐波干扰(典型值40 dB),无需复杂RF预滤波,提升了接收机的线性度(IIP3达10 dBm,IIP2达53 dBm)。
低功耗与高集成度:在65 nm CMOS工艺下实现,集成多相时钟生成功能,整体功耗低于19 mW,同时实现0.5至2.5 dB增益和18至20 dB DSB噪声系数,适合SoC集成。
Abstract
nk , Senior Member , IEEE, and Bram Nauta , Fellow, IEEE Abstract—A discrete-time (DT) mixing architecture for RF-sam- pling receivers is presented. This architecture makes RF sampling more suitable for software-defined radio (SDR) as it achieves wide- band quadrature demodulation and wideband harmonic rejection. The paper consists of two parts. In the first part, different down- conversion techniques are classified and compared, leading to the definition of a DT mixing concept. The suitability of C