低噪声放大器高线性度偏置的数学证明

Mathematical Proof of Low Noise Amplifier High Linearity Bias Circuit

通信技术日新月异,通信产品的更新换代越来越快,性能越来越优,客服体验要求越来越高,无疑对通信芯片的设计提出了更高的要求和挑战。通信芯片的核心在于接收机,而接收机的关键在于低噪声放大器。低噪声放大器的核心指标是噪声、增益和线性度。低噪声放大器线性度对整个系统的线性度起着重要作用,它的非线性越小越好。低噪声放大器的线性度受偏置电路的直流阻抗影响较大。文中对一种工作在S波段,能极好地提高低噪声放大器线性度的偏置电路给出了数学证明。

Advances in communications technology, communication products renewal faster and faster, more and more optimal per- formance and the experience of the service demand is higher and higher. This put forward higher requirements and challeng for the com- munication chip design. . The core index of the low noise amplifier is noise, gain and linearity. The linearity of low noise amplifier plays an important role in the the linearity of whole system, its nonlinear as small as possible. Low noise amplifier＇ s linearity is great- ly influenced by de bias circuit impedance. This paper gave mathematical proof of a kind of bias circuit, which work in S band, and can improve the low noise amplifier linearity very good.