多模式卫星导航接收机中双频段LNA设计

Dual-Band CMOS LNA for Multimode GNSS Receiver

摘要: 设计出一款应用于多模式卫星导航接收机射频前端的双波段LNA,该电路可以工作在1.575 GHz和1 267 GHz两个波段附近,覆盖了当今各种卫星导航系统的载波频段.LNA的输入阻抗和输出阻抗均被匹配到50 Ω,电路采用0.18 μm CMOS工艺实现.测试结果表明该电路在1.575 GHz和1.267 GHz两个波段上噪声系数分别为0.88 dB和0.78 dB,功率增益分别为25.5 dB 和25.9 dB,S11分别为-16 dB和- 12.5 dB,1dB压缩点分别为-23.4 dBm和-23.6 dBm,1.8 V供电电压条件下静态工作电流均为4.0 mA.电路在上述两个频段上稳定性均满足要求.

Abstract: A dual-band low-noise amplifier (LNA) for RF front-end of multimodal GNSS receiver is presented, which is capable of handling input signals near by 1.575 GHz and 1.267 GHz.All of the inputs and outputs are matched to 50 Ω.A 0.18 μm CMOS process is used for the circuit.measurement results show that the LNA has a noise figure of 0.88 dB and 0.78 dB, a power gain of 25.5 dB and 25.9 dB, a S11 of-16 dB and-12.5 dB, a P1 dB of-23.4 dBm and-23.6 dBm with good stability and bias current of 4.0 mA from a 1.8 V supply at 1.575 GHz and 1.267 GHz respectively.The circuit can satisfy the requirements very well.