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设计了一种带片内变压器、适用于0.05~2.5 GHz频段的宽带低噪声放大器(LNA)。电路设计采用了并行的共栅共源放大结构,将从天线接收到的单端输入信号转换为一对差分信号输出给后级链路。针对变压器结构的LNA噪声系数不够低和输出不平衡的问题,采用了缩放技术、噪声消除技术以及两级的全差分放大器作为输出缓冲级,来有效降低电路的噪声系数,提高增益和输出平衡度。电路采用TSMC 0.18μm 1P6M RF CMOS工艺设计仿真和流片,测试结果表明:在0.05~2.5 GHz频带范围内,该LNA的最高功率增益达24.5 d B,全频段内噪声系数为2.6~4 d B,输入反射系数小于-10 d B,输出差分信号幅度和相位差分别低于0.6 d B和1.8°。
A low-noise amplifier (LNA) designed with an on-chip transformer for the 0.05-2.5 GHz band is designed. Circuit design uses a parallel cascode amplifier structure, the single-ended input signal received from the antenna is converted to a pair of differential signal output to the next stage of the link. Aiming at the problem of low enough LNA noise coefficient and unbalanced output of the transformer structure, scaling technology, noise cancellation technology and two stages of fully differential amplifier are used as output buffers to effectively reduce the noise figure of the circuit and improve the gain and output balance . The circuit uses TSMC 0.18μm 1P6M RF CMOS process design simulation and flow sheet test results show that the maximum power gain of the LNA up to 24.5 d B in the frequency range of 0.05 ~ 2.5 GHz, the noise figure of 2.6 ~ 4 d B , The input reflection coefficient is less than -10 d B, the output differential signal amplitude and phase difference are less than 0.6 d B and 1.8 ° respectively.