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设计了一款"基于噪声抵消技术的低功耗C频段的差分低噪声放大器。该放大器由输入级、放大级以及输出缓冲级3个模块构成,其中输入级采用电容交叉耦合的差分对与直接交叉耦合结构差分对级联,实现输入匹配及噪声抵消;放大级采用具有电阻-电感并联反馈的电流复用结构来获得高的增益、良好的增益平坦性及低的功耗;输出缓冲级采用源跟随器结构,实现良好的输出匹配。基于TSMC 0.18μm CMOS工艺库,验证表明在C频段,放大器的增益为20.4$0.5 dB,噪声系数介于2.3~2.4 dB之间,输入和输出的回波损耗均优于-11 dB,稳定因子恒大于1,在6.5 GHz下,1 dB压缩点为-16.6 dBm,IIP3为-7 dBm,在2.5 V电压下,电路功耗仅为6.75 mW。
A low-power C-band differential LNA based on noise cancellation technology is designed, which consists of three modules: input stage, amplifier stage and output buffer stage, in which the input stage adopts a capacitive cross-coupled differential pair and Direct cross-coupling differential pair cascade structure to achieve the input matching and noise cancellation; amplifier stage with resistance - inductance parallel feedback current multiplexing structure to obtain high gain, good gain flatness and low power consumption; output buffer stage Based on the TSMC 0.18μm CMOS technology library, the verification shows that the gain of the amplifier is 20.4 $ 0.5 dB, the noise figure is between 2.3 and 2.4 dB, and the input and output back The loss is better than -11 dB and the stability factor is always greater than unity. At 6.5 GHz, the 1 dB compression point is -16.6 dBm and the IIP3 is -7 dBm. The circuit consumes only 6.75 mW at 2.5 V.