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The Path to the Software-Defined
提出一种适用于移动终端的软件定义无线电接收机架构，通过电子调谐前端和可编程基带处理实现灵活信道接收。
90nm CMOS, 800MHz-6GHz调谐范围, 200kHz-20MHz信道带宽
软件定义无线电移动终端零中频接收机电子调谐CMOS射频前端
▸电子调谐前端设计：采用宽带低噪声放大器和可调谐混频器，通过宽频带LO实现800 MHz至6 GHz的全频段覆盖，解决了传统射频前端无法适应多频段需求的问题（系统创新）。
▸零中频可编程基带采样：提出基于零中频的灵活模拟基带采样架构，直接对目标信道进行采样，避免了传统超外差结构的镜像干扰问题，显著提高了接收机灵敏度（方法创新）。
▸嵌入式滤波降采样技术：结合时钟可编程降采样与嵌入式滤波技术，实现可调谐选择性，其性能超越传统射频预滤波器，同时将转换速率降低至毫瓦级功耗水平（电路创新）。
▸宽频带可配置接收机：支持200 kHz至20 MHz带宽信道的全频段接收，在90nm CMOS工艺下实现，为软件定义无线电在移动终端的应用提供了硬件基础（系统创新）。
Abstract
After being the subject of speculation for many years, a software-defined radio receiver concept has emerged that is suit- able for mobile handsets. A key step forward is the realization that in mobile handsets, it is enough to receive one channel with any bandwidth, situated in any band. Thus, the front-end can be tuned electronically. Taking a cue from a digital front-end, the receiver’s flexible analog baseband samples the channel of interest at zero IF, and is followed by clock-programmable downsampling with em- bedded filtering. This gives a tunable selectivity that exceeds that of an RF prefilter, and a conversion rate that is low enough for A/D conversion at only milliwatts. The front-end consists of a wide- band low noise amplifier and a mixer tunable by a wideband LO. A 90-nm CMOS prototype tunes 200 kHz to 20-MHz-wide channels located anywhere from 800 MHz to 6 GHz.