A Low-Power WCDMA Transmitter with an Integrated Notch Filter

📋 论文概要

本文提出了一种集成陷波滤波器的低功耗WCDMA发射机，用于解决FDD系统中发射机泄漏到接收机导致的灵敏度下降问题。通过片上陷波滤波器有效抑制发射机噪声，从而消除了传统上所需的外部SAW滤波器。

💡 主要创新点

• 集成片上陷波滤波器替代外部SAW滤波器，降低系统成本和体积。
• 通过低功耗设计技术实现发射机整体功耗的显著降低。

🏷 关键词

📄 原文摘要

In a WCDMA FDD system, since the transmitter and receiver operate concurrently, the receiver is plagued by the transmitter leakage due to finite isolation of antenna duplexer. As a consequence, the transmitter noise at the receive band degrades the sensitivity, unless the noise is further attenuated before reaching the receiver. Due to the modest Q of on-chip inductors, typically the use of a costly SAW filter placed before the PA is inevitable. On the other hand, the external filter may be eliminated through sufficiently lowering the transmitter noise for any given duplexer [13]. However, given the power-noise trade off, in all previous designs due to the lack of an on-chip filtering mechanism, meeting the stringent noise requirement has resulted in an excessive transmitter power dissipation. To address these issues, a feedback-based filtering technique to suppress the receive-band noise with negligible

👥 作者与机构

Ahmad Mirzaei, Hooman Darabi

Broadcom, Irvine, CA