A Phase-Noise and Spur Filtering Technique Using Reciprocal-Mixing Cancellation

📋 论文概要

该论文提出了一种利用互混消除的相位噪声和杂散滤波技术，解决了在存在大功率阻塞信号时，接收机因互混导致的噪声系数恶化问题。通过该技术，可以在不依赖外部射频滤波的情况下，有效抑制阻塞信号引起的相位噪声和杂散干扰。

💡 主要创新点

• 提出了一种基于互混消除的相位噪声和杂散滤波技术，通过电路设计实现阻塞信号引起的噪声抵消。
• 该技术无需额外的射频滤波，即可在接收机中实现高阻塞容限，降低了系统复杂度和成本。

🏷 关键词

📄 原文摘要

Recent passive-mixer-based architectures, such as [1], have shown that blockers as large as 0dBm can be tolerated without excessive gain compression. However, even in a perfectly linear receiver, reciprocal mixing of the blocker with LO phase noise deposits additive noise on the wanted signal, as shown in Fig. 5.3.1. This is an inevitable limitation to any mixer-based receiver. Assuming that the blocker experiences no passive RF filtering, the noise figure of such a receiver in the presence of a given blocker is only lowered through improving the LO phase noise. To overcome this challenge, most wireless receivers use LC-oscillators that despite their superior phase noise to ring oscillators [2], still consume a large portion of the radio power. As the quality factor of on-chip resonators does not scale with technology, the phase noise of an LC-oscillator can only be improved by consuming more power, while the benefits of circuit innovation are

👥 作者与机构

Mohyee Mikhemar, David Murphy, Ahmad Mirzaei, Hooman Darabi

Broadcom, Irvine, CA