改进的LMS自适应滤波器结构，提高了射频稳定性

Proceedings of the 31st European Solid-State Circuits Conference, 2005. ESSCIRC 2005. Pub Date : 2005-12-05 DOI:10.1109/ESSCIR.2005.1541603

V. Aparin

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引用次数: 0

摘要

利用拉普拉斯变换分析了传统LMS自适应滤波器在射频下的稳定性。研究表明，射频信号沿滤波器反馈回路的延迟会使其不稳定。对滤波器结构进行了简单的修改，以提高环路相位裕度。本文描述了该架构在0.25/spl μ m CMOS技术下的实际实现。所设计的滤波器用作蜂窝频带CDMA接收机的一部分，用于在混频器输入处抑制发射机信号泄漏。它达到了28dB的最大抑制。

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A modified LMS adaptive filter architecture with improved stability at RF

Stability of a conventional LMS adaptive filter at RF is analyzed using the Laplace transform. It is shown that the RF signal delays along the filter feedback loop can make it unstable. A simple modification to the filter architecture is proposed to improve the loop phase margin. A practical implementation of the proposed architecture in 0.25/spl mu/m CMOS technology is described. The designed filter is used as part of a cellular-band CDMA receiver to reject a transmitter signal leakage at the mixer input. It achieved the maximum rejection of 28dB.

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Proceedings of the 31st European Solid-State Circuits Conference, 2005. ESSCIRC 2005.

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