CMOS宽带线性可变增益低噪声放大器设计

文章设计了一种48MHz~860MHz宽带线性可变增益低噪声放大器,该放大器采用信号相加式结构电路、控制信号转换电路和电压并联负反馈技术实现。详细分析了线性增益控制、输入宽带匹配和噪声优化方法。采用TSMC0.18μm RF CMOS工艺对电路进行设计,仿真结果表明,对数增益线性变化范围为-5dB~18dB,最小噪声系数为2.9dB,S11和S22小于-10dB,输入1dB压缩点大于-14.5dBm,在1.8V电源电压下,功耗为45mW。

A Broadband CMOS Linear Variable Gain Low Noise Amplifier Design

This paper presents a 48 MHz ~860MHz broadband CMOS linear variable gain low noise amplifier (LNA) design. This LNA is combined with signal-summing structure, control signal converter and uses voltage-shunt negative feedback technique. The linear variable gain controlling, input wideband matching and noise optimization methods are analyzed in detail. The LNA is designed in TSMC 0.18μm RF CMOS technology, and achieves a linear logarithmic gain range of -5dB~18dB, a minimum noise figure of 2.9dB, S11 and S22 less than -10dB, input P1dB more than -14.5dBm, while consuming 45 mW from a 1.8 V power supply.