摘要
为解决ISM频段小信号放大器降低失配与减小噪声之间的矛盾,提出了一种改善放大器性能的分析方法,满足信源、晶体管与负载三者之间的失配程度在受限条件下增益和噪声的最优化。指出增益、驻波比和噪声多个性能参数不能同时达到最优,提出了提高射频放大器综合性能的方法。在2.4GHz的ISM频段进行的仿真结果表明,驻波比越小,增益越大,噪声系数受失配限制的影响,在满足增益的条件下失配受限会使噪声系数增大。
To resolve the conflict between decreasing mismatch and diminishing noise at ISM band, a method for improving amplifier performance of small signal is proposed to implement the optimal gain and noise, satisfying the mismatch limit between source and transistor as well as between transistor and load termination. It is pointed out that the parameter of gain, VSWR and noise are impossible to be optimal simutaneously. The method for improving the comprehensive performance of RF amplifier is proposed. The amplifier is simulated at ISM band of 2.4GHz, and the results show that the smaller the VSWR is, the larger the gain is the noise figure is affected by limitation of mismatch, and the limitation of mismatch will cause the increasing of noise figure under the target gain.
出处
《电讯技术》
北大核心
2010年第3期59-63,共5页
Telecommunication Engineering
