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JSSC 2010第12期RF & Wireless65nmDelta-Sigma ADC

A 900-MHz Direct Delta-Sigma Receiver in 65-nm CMOS Kimmo Koli Member IEEE Sami

介绍了一种用于LTE或WiMax的900MHz直接ΔΣ接收机架构，采用65nm CMOS工艺。
65nm CMOS, 1.2V, 80mW, NF 2.3/6.2dB, OOB IIP3 +43dBm
ΔΣ接收机直接下变频N路径滤波CMOS无线通信
▸创新点1：直接下变频架构，通过将射频信号直接转换为基带信号，简化了接收机结构，降低了功耗和复杂度，适用于LTE和WiMax等无线通信系统。
▸创新点2：上变频至RF的ΔΣ反馈，通过在射频域引入ΔΣ调制反馈，显著提高了接收机的线性度，同时减轻了后续关键电路的设计压力。
▸创新点3：N路径滤波技术，利用多路径滤波实现高效的通道选择滤波，将核心接收功能嵌入到射频ADC中，提升了系统的整体性能和集成度。
▸创新点4：该接收机在65-nm CMOS工艺下实现了2.3 dB和6.2 dB的噪声系数，以及高达+43 dBm的带外IIP3，展示了优异的线性性能和低噪声特性。
Abstract
Direct delta-sigma receiver architecture is introduced for wireless communication systems, such as LTE or WiMax. Ar- chitecture is based on direct downconversion, delta-sigma feed- back that is up-converted to RF , and N-path filtering technique. Hence, the core receiver functions including channel selection fil- tering are embedded to a RF ADC with excellent linearity per- formance. This is achieved by transforming narrow-band filtering partially to RF injecting feedback into the input of the seco