0.1-1.2 GHz宽带巴伦低噪声放大器设计

Design of a 0.1-1.2 GHz Wideband Balun-LNA

提出了一种可用于0.1-1.2 GHz射频接收机前端的宽带巴伦低噪声放大器(Balun-LNA).采用噪声抵消技术,输入匹配网络的沟道热噪声和闪烁噪声在输出端被抵消,在宽带内可同时实现良好的输入匹配和低噪声性能.通过分别在输入匹配级内增加共源放大器,在噪声抵消级内增加共源共栅放大器实现单端转差分功能.电路采用电流复用技术降低系统功耗.设计基于TSMC 0.18μm CMOS工艺,LNA的最大增益达到13.5dB,噪声系数为3.2-4.1 d B,输入回波损耗低于-15 d B.在700 MHz处输入1 dB压缩点为-8 dBm,在1.8 V供电电压下电路的直流功耗为24 mW,芯片面积为0.062 5 mm^2.

A broadband Balun-LNA for 0.1-1.2 GHz RF receiver frontend was proposed. By employing noise-canceling technique, the channel thermal noise and the flicker noise of input matching stage could be canceled at the outputs, and good input matching and noise performance could be achieved simultaneously. A common-source amplifier was added behind the input matching stage and a cascade amplifier was added in the noise-canceling stage respectively to realize single-to-differential conversion. The approach of current reuse was exploited for lower power consumption. Designed in TSMC 0.18 μm CMOS process,the LNA provides a maximum gain of 13.5 dB, a noise of 3.2-4.1 dB, and an input return loss lower than-15 dB. The input P1 dB at 700 MHz is-8 dBm. It consumes 24 mW from a 1.8 V supply and occupies 0.062 5 mm^2.