JSSC 2012第12期RF & Wireless40nm

A Blocker-Tolerant Noise-Cancelling Receiver Suitable for Wideband Wireless Appl

提出一种新型宽带接收器架构，采用双路径下变频实现噪声消除，避免阻塞频率下的电压增益。

40 nm, 80 MHz to 2.7 GHz, 2 dB noise figure, 4.1 dB with 0 dBm blocker

宽带接收器噪声消除被动混频器阻塞频率线性度

▸创新点1：双路径被动混频器下变频（电路创新）：采用两个独立的被动混频器路径进行下变频，有效分离信号与噪声路径，显著提升接收机的噪声性能。

▸创新点2：噪声消除技术（系统创新）：通过双路径设计实现噪声消除，在80 MHz至2.7 GHz频段内实现2 dB的低噪声系数，并在0 dBm阻塞信号下仅恶化至4.1 dB。

▸创新点3：避免阻塞频率下的电压增益（方法创新）：通过优化电路设计，避免在阻塞频率下引入电压增益，从而显著改善接收机的带外线性度和抗阻塞能力。

▸创新点4：宽频带操作优化（系统创新）：该架构在40 nm工艺下实现，支持从80 MHz到2.7 GHz的宽频带操作，解决了噪声、带外线性度与带宽之间的权衡问题。

Abstract

A new wideband receiver architecture is proposed that employs two separate passive-mixer-based downconversion paths, which enables noise cancelling, but avoids voltage gain at blocker frequencies. This approach signi ﬁcantly relaxes the trade-off between noise, out-o f-band linearity and wideband operation. The resulting prototype in 40 nm is functional from 80 MHz to 2.7 GHz and achieves a 2 dB noise ﬁgure, which only degrades to 4.1 dB in the presence of a 0 dBm blocker.