A Blocker-Resilient Wideband Receiver with Low-Noise Active Two-Point Cancellation of >0dBm TX Leakage and TX Noise in RX Band for FDD/Co-Existence

📋 论文概要

本文提出了一种具有低噪声有源两点抵消技术的宽带接收机，用于抑制超过0dBm的发射机泄漏和发射机噪声，解决了由于天线/双工器隔离度降低导致的强带外调制发射泄漏问题。该设计提高了接收机对阻塞信号的容忍度，适用于软件定义无线电和FDD系统。

💡 主要创新点

• 提出了一种有源两点抵消架构，在接收机前端同时抑制发射泄漏和发射噪声，实现超过0dBm的泄漏抑制能力。
• 采用低噪声设计，避免抵消电路本身引入额外噪声，保持接收机灵敏度。
• 实现了宽带工作，适用于多频段和可重构无线系统。

🏷 关键词

📄 原文摘要

The demand for lower cost and form factor and increased re-configurability in wireless systems has driven the investigation of blocker-tolerant softwaredefined radios [1-4]. While promising, a reduction in system form-factor will result in lower isolation among antennas due to the co-existence of multiple ratios or lower isolation within duplexers for FDD systems due to their reduced size and/or increased re-configurability. Out-of-band (OOB) powerful modulated TX-leakage due to limited antenna/duplexer isolation imposes challenges that are more severe than those posed by continuous-wave (CW) blockers by several orders of magnitude, including cross-modulation, second-order intermodulation and TX noise in the RX band (Fig. 20.6.1). Analysis shows that in the face of 0dBm peak TX leakage and a -30dBm CW in-band jammer, to achieve -90dBm sensitivity with 7dB SNR over 2MHz signal BW, a transceiver must exhibit

👥 作者与机构

Jin Zhou, Peter R. Kinget, Harish Krishnaswamy

Columbia University, New York, NY