Design of 3-6 GHz SiGe HBT Cascode Low Noise Amplifier

Based on Jazz 0.35 μm SiGe process,a SiGe HBT low-noise amplifier (LNA) for UWB and IEEE 802.11a application is presented.The technology of inductive shunt peaking and cascade configuration is adopted to enhance the bandwidth.Finally,the chip layout is designed with its area 1.16×0.78 mm².For the range of 3-6 GHz bandwidth,the maximum power gain is 26.9 dB,and gain flatness is ±0.9 dB.The input and output match well,input and output reflections (S₁₁ and S₂₂) are both less than-10 dB,the input VSWR and output VSWR are both less than 1.5,and the 1 dB compression point is-22.9 dBm.The LNA is unconditionally stable in the whole band.