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设计了一个可用于低中频GPS接收机系统的1.575GHz的低噪声放大器.首先考虑了ESD保护二极管和焊盘的寄生效应,对输入匹配和噪声性能的优化做了分析,并将窄带电感模型用于电路设计优化.其次基于Vol-terra级数,对放大器的非线性做了分析,推导了电路各参数与IIP3的关系表达式,据此在功耗和线性度之间做了折衷考虑.采用TSMC0.18μm射频工艺对低噪声放大器进行设计和仿真.仿真结果表明:在1.8V工作电压下,噪声系数仅为1.1dB,IIP3为-8.3dBm,电流消耗3mA,电路的输入匹配良好.
A low-noise amplifier of 1.575GHz which can be used in low-IF GPS receiver system is designed.At first, the parasitic effect of ESD protection diode and pad is considered, the optimization of input matching and noise performance is analyzed, and the narrow- In the circuit design optimization.Secondly, based on the Volterra series, the nonlinearity of the amplifier is analyzed and the expression of the relationship between the parameters of the circuit and IIP3 is deduced, so as to make a compromise between power consumption and linearity. The TSMC 0.18μm radio frequency technology is used to design and simulate low noise amplifier. The simulation results show that the noise figure is only 1.1dB, the IIP3 is -8.3dBm, the current consumption is 3mA and the input of the circuit is well matched under the operating voltage of 1.8V.