The Research And Design Of Low Noise Amplifier For Rf Front-end

The low noise amplifier(LNA)is a key circuit of the radio frequency front-end(RFFE),which can amplify the weak signal received by the antenna and ensure that the additional noise of the amplified signal is small without distortion.Because the noise figure,gain and bandwidth of the LNA directly determine the sensitivity,dynamic range and working bandwidth of the receiving chain,it is very important to research and design the high performance LNA.Based on the process of Sanan0.15?m GaAs pHEMT,a narrowband and ultra-wide bandwidth(UWB)LNA for RFFE are designed in this paper.The main research and design results are as follows:1.Based on the process of Sanan 0.15?m GaAs pHEMT,a 23-25GHz narrowband LNA is researched and designed.In order to compensate for the gain deficiency of single-stage transistor at high frequency band,the circuit uses two-stage common source cascade;in order to achieve the balance between gain and circuit stability,the circuit uses the source negative feedback technology;in order to ensure that the circuit still has low noise at high frequency,the circuit uses the best noise matching at the input port.The layout simulation results show that the circuit is absolutely stable,the noise figure is less than 2.5dB,the gain is greater than 13.0dB,and the input and output reflection coefficient is less than-10dB in the frequency range of 23-25GHz.At the 24GHz frequency point,the gain is 14.0dB and the noise figure is 2.5dB.The DC power consumption is 44mW and the layout area is0.8x0.5mm~2.2.Based on the process of Sanan 0.15?m GaAs pHEMT,an 18-28GHz ultra-wide bandwidth LNA is researched and designed.In order to achieve both ultra-wide bandwidth and high gain flatness,the four-stage common source cascade combines multistage bandwidth gain compensation technology and parallel inductance peak technology;in order to achieve better port reflection coefficient while satisfying ultra-wide bandwidth,high gain and high gain flatness,the circuit uses the method of simultaneous matching between input and output ports.The layout simulation results show that the LNA is absolutely stable,the range of the noise figure is 5.0-3.2dB,the range of the gain is 22.0-24.0dB,the gain flatness is within±1.0dB,and the input and output reflection coefficients are below-12dB in the frequency range of 18-28GHz.At the 24GHz frequency point,the minimum noise figure of the LNA is 3.2dB and the gain is 23.0dB.The DC power consumption is 88mW and the layout area is 1.4x0.6mm~2.