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JSSC 2019第2期RF & Wireless28nm

High-Linearity Bottom-Plate Mixing Technique With Switch Sharing for N-path Filt

提出一种高线性度底极板混频技术，用于SAW-less FDD接收机，实现低噪声和高线性度。
28nm CMOS, +44 dBm OOB IIP3, +90 dBm IIP2, +13 dBm 1-dB压缩点, 38-96 mW功耗
底极板混频开关共享四路径滤波器高线性度SAW-less接收机
▸底极板混频技术提高线性度
▸差分底极板混频实现开关共享
▸交叉耦合开关-RC四路径级提供低阻高线性电流路径
Abstract
A four-path filter/mixer for surface acoustic wave (SA W)-less frequency division duplex (FDD) radio receivers is proposed, targeting high linearity and compression require- ments. A bottom-plate mixing technique improves linearity by reducing the gate-source voltage modulation of the MOSFET switches. Differential bottom-plate mixing allows for switch sharing which halves the effective switch resistance to reduce drain-source voltage modulation. The first four-path switch-RC filter stage with botto