Broadband Low Noise Amplifier Using Improved Noise Cancellation Technology
Noise cancellation is a common technology in the design of low noise amplifiers(LNA).Solving the contradiction between noise and power consumption is the most difficult challenge during the design process.A new noise cancellation structure is proposed in this study.Noise in the main and auxiliary branches is eliminated by adding a feedback loop between the main and auxiliary branches,without increasing power consumption.Based on a 180 nm CMOS technology,a wideband low noise amplifier with the noise cancellation structure is designed.Simulation results show that the bandwidth of the LNA is 0.4-2.36 GHz,both S11 and S22 are less than-10 dB,S12 is less than-30 dB,the maximum S21 is 14.5 dB,the noise factor is 2.20-2.34 dB,and the power consumption is 9 mW.
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