Abstract: A low noise amplifier (LNA) for Beidou navigation system was designed through the standard GaAs pHEMT technology. This circuit had the operating frequency of 2.45 GHz and noise figure of 0.55 dB. ESD protection circuit was added through the input and output matching network. Finally ADS2011 was used to simulate the design. According to the comparison of the circuit with ESD protection and that without ESD protection, the conclusion can be drawn that the circuit with ESD protection will induce some decline of the performance, such as the gain drawn from 16 dB down to 15 dB, but the noise has no change; with the ESD protection, the circuit can be greatly improved in overall performance and robustness, and the circuit has good resistance to electrostatic interference.

Key words: ESD, LNA, matching network, robustness

摘要： 将GaAs PHEMT工艺设计应用于北斗卫星导航的LNA电路, 工作频率为2.45 GHz, 噪声系数为0.55 dB, 并在输入输出的匹配网络上添加ESD保护。通过使用ADS2011进行仿真, 对比分析有ESD保护的电路与没有ESD保护的电路, 得到以下结论: 虽然考虑ESD保护使电路的性能有一些下降, 如增益从16 dB下降到15 dB, 但噪声系数几乎没有变化; 加入ESD保护后, 可以极大地提高电路整体的性能和鲁棒性, 使电路能够很好地抵抗静电干扰。

关键词: 静电泄漏, 低噪声放大器, 阻抗匹配, 鲁棒性