针对UWB应用设计实现了一个1.5-6GHz的两级CMOS低噪声放大器(LNA).通过引入共栅(CG)和共源(CS)结构以获得宽范围内的输入匹配,采用电流镜和峰化电感进行电流复用,所提出的LNA实现了非常平坦化的功率增益和噪声系数(NF).经标准0.18μm CMOS工艺实现后,版图后模拟结果表明在1.5-5GHz频率范围内功率增益(S21)为11.45±0.05dB,在2-6GHz频率范围内噪声系数(NF)为5.15±0.05dB,输入损耗(S11)小于-18dB.在5GHz时,模拟得到的三阶交调点(IIP3)为-7dBm,1dB压缩点为-5dBm.在1.8V电源电压下,LNA消耗6mA的电流,版图实现面积仅为0.62mm^2.
A two-stage 1.5-6GHz CMOS Low Noise Amplifier(LNA) for Ultra-Wide-Band(UWB) applications is presented.By introducing common-gate(CG) and common-source(CS) stages to obtain broad-band input matching and current mirror to reuse current through a peaking inductor,the proposed LNA has achieved extra flat power gain and Noise Figure(NF).This LNA has been implemented by a 0.18μm standard CMOS process.Post simulation results have indicated that the power gain(S21) achieves 11.45±0.05dB over the wide frequency band of 1.5-5GHz,and NF maintains 5.15±0.05dB from 2GHz to 6GHz with input return loss(S11)-18dB in the entire band.The simulated input-referred third-order intercept point(IIP3) at 5GHz is -7dBm,while the 1dB compression point is-5dBm.It draws 6mA from 1.8 V supply and occupies an area of only 0.62mm^2.