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宽带低噪声放大器能同时接收多路信号,这些信号会相互成为干扰源,因此要求宽带低噪声放大器同时具有较高的IIP2和IIP3,抑制这些干扰。在传统共栅共源巴伦低噪声放大器的基础上,对决定噪声和线性度的共源级采用了后失真技术。通过一个PMOS辅助管,对共源级输出信号的二次和三次非线性项都进行了抑制,使得整个放大器的线性度得到较大的提升。在0.2~4.35GHz的范围内,该放大器的IIP2大于23dBm,IIP3大于5dBm。另外,共源放大管的衬底电阻对放大器有较大的噪声贡献,通过串接一个衬底大电阻,将其噪声贡献由10%降低到了1%左右。
Broadband LNAs can receive multiple signals simultaneously, and these signals can interfere with each other, requiring broadband LNAs to have both IIP2 and IIP3 at the same time to suppress these disturbances. Based on the traditional common-gate common-source balun low-noise amplifier, post-distortion techniques are applied to the common-source stage that determines noise and linearity. Through a PMOS auxiliary tube, the common-level output signal of the second and third non-linear terms were suppressed, making the entire amplifier linearity is greatly improved. In the range of 0.2 to 4.35 GHz, the amplifier has an IIP2 of more than 23 dBm and an IIP3 of more than 5 dBm. In addition, the substrate resistance of the common source amplifier tube has a larger noise contribution to the amplifier, and the noise contribution is reduced from 10% to about 1% by connecting a large substrate resistance.