结合电阻并联反馈，利用PCSNIM 流程设计了一个用于超宽带(UWB)系统的宽带LNA电路。电阻并联反馈降低了输入电路的Q 值，使窄带LNA 带宽增加，而对NF 的影响很小。用TSMC 0.18μm CMOS 工艺进行仿真，结果表明，LNA在3.1~5.1GHz 带宽范围内NF小于2.9dB，输入匹配优于-10.5dB，功率增益为12.9dB，带内波动仅为1dB。在1.8V 电源电压下，核心电路功耗为7.5mW。关键词：低噪声放大器；电阻并联反馈；超宽带Abstract: A wideband low noise amplifier (LNA) topology for ultra-wideband (UWB) system is proposed by combining PCSNIM design flow with a resistive shunt-feedback. The resistiveshunt-feedback provides wideband input matching with small noise figure (NF) degradation by reducing the Q-factor of the narrowband LNA input. Results from the simulation using TSMC’s 0.18μm CMOS technology show a maximum NF of 2.9dB, better than -10.5dB of inputmatching and a power gain of 12.9dB with only 1dB variations over the entire band from 3.1 GHz to 5.1 GHz. The core LNA consumes 7.5mW with a 1.8V supply.Key words: low noise amplifier; resistive shunt-feedback; ultra-wideband
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