基于ADS的平衡式低噪声放大器设计

平衡放大技术有着驻波特性好,增益高、易级联的优点。本文将平衡放大技术应用到低噪声放大器的设计中,在保证低噪声和功率增益的同时,用以提高低噪声放大器的驻波比和增益平坦度。ADS仿真结果表明,在5.3-6.3 GHz的频带范围内,低噪声放大器绝对稳定,噪声系数≤1.182 dB,功率增益达到10 dB,并且通过采用平衡放大技术,输入输出驻波比≤1.3∶1,带内波动≤1dB,提高了低噪声放大器的有效工作带宽。

Design of a Balanced Low Noise Amplifier Based on ADS

Being possessed the advantages such as good voltage standing wave ratio （VSWR）, high gain and easily to be cascaded, the balanced amplifying technique is applied in low noise amplifier （LNA） design in this paper to improve VSWR and gain flatness of LNA while ensuring the low noise and power gain. The simulation results by using ADS show that the LNA is absolutely stable within the band range of 2.3 - 6. 3GHz, and the noise figure 1. 182dB, and power gain reaches 10dB. By utilizing balanced amplifying technique, the input and output VSWR ≤ 1.3：1, and in-band ripple ≤ 1 dB, the effective operation bandwidth of the LNA is improved.