CAJ | 학술논문

选用SiGe HBT作为电路的有源器件,利用基极串联电感L_B与反馈支路、晶体管Miller效应所产生的寄生电容形成的T型匹配网络取得了输入阻抗的良好匹配,并就基极串联电感值对系统群延时的影响进行了讨论,优化L_B以满足兼容群延时与宽带匹配的要求.该放大器在3.1～10.6 GHz的带宽内增益达到12.7 dB,增益变化小于等于1.8 dB,噪声小于3.85 dB,群延时小于24 ps,静态功耗仅为6.3 mW.
선용SiGe HBT작위전로적유원기건,이용기겁천련전감L_B여반궤지로、정체관Miller효응소산생적기생전용형성적T형필배망락취득료수입조항적량호필배,병취기겁천련전감치대계통군연시적영향진행료토론,우화L_B이만족겸용군연시여관대필배적요구.해방대기재3.1～10.6 GHz적대관내증익체도12.7 dB,증익변화소우등우1.8 dB,조성소우3.85 dB,군연시소우24 ps,정태공모부위6.3 mW.
A resistive-feedback UWB LNA (ultra-wideband low noise amplifier) was presented. SiGe HBT was adopted as the active device of this LNA. A novel methodology was proposed to match the input impedance of this LNA with advantage of T-type matching network constituted of the serial inductance at the base, feedback loop and Miller capacitors. Meanwhile, the effect of the serial inductance on the group delay of this LNA was discussed for optimizing LB. The simulation results indicate the gain of LNA reaches as high as 12.7 dB with the variation of 1.8 dB, NF is less than 3.85 dB, group delay is less than 24 ps from 3.1 to 10.6 GHz and the power consuming is only 6.3 mW.