A 300 kHz -1.6 GHz wideband CMOS low noise amplifier ( LNA) for software-defined radio receivers was de-signed. It is fit for the applications in digital radio, digital TV and global position systems. The channel thermal noise and the flicker noise of the input metal oxide semiconductor field effect transistor (MOSFET) is canceled by exploiting a noise canceling technique. A lower noise figure and an excellent wide-band input matching can be achieved at the same time. It was designed in SMIC s 0.18 μm RF CMOS process. The measured results show that in the band of 300 kHz -1.6 GHz, the maximum gain SP/G network; successive over-relaxation (SOR);open defect; algorithm; incomplete Cholesky decomposition conjugate gradient (ICCG)_(21) is 16.7 dB, the input reflection factor S_(11) is lower than - 7.4 dB, the minimum noise figure (NF) is 2.3 dB, and the input-referred 1-dB gain compression point is 11.6 dBm. Its consuming power is 14.4 mW. The chip area is 0.49 mm .%设计了一种应用于软件无线电接收机的300kHz～1.6GHz宽带低噪声放大器,适用于数字广播、数字电视和定位导航等系统.该放大器采用噪声抵消结构以降低输入匹配器件在输出端所产生的热噪声和闪烁噪声,能够同时实现输入阻抗匹配和噪声优化.对采用中芯国际(SMIC)0.18 μm RF CMOS工艺实现的芯片的测试结果表明,3dB带宽为300kHz～1.6GHz,最大增益S_(21)为16.7dB,输入反射系数S_(11)小于-7.4dB,最小噪声系数为2.3 dB,输入参考的1dB增益压缩点为-11.6dBm,功耗为14.4mW,芯片面积为0.49mm~2.
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