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在毫米波通信系统中,振荡器是最基本的微波频率源。本文介绍了一种串联反馈型介质振荡器的设计方法,基于负阻理论和谐波平衡法,利用HFSS和ADS设计了10.5Ghz的低相位噪声串联反馈型介质振荡器。HFSS用来精确仿真介质谐振器与微带线的耦合;ADS用来对振荡器非线性仿真,优化相位噪声和输出功率。在设计过程中,采用低噪声PHEMT晶体管ATF-34143作为振荡器的有源器件,高Q值、高介电常数的介质谐振器作为稳频元件,确定振荡器的谐振频率。
In millimeter wave communication system, the oscillator is the most basic microwave frequency source. In this paper, a design method of series feedback type medium oscillator is introduced. Based on the negative resistance theory and the harmonic balance method, a 10.5Ghz low phase noise series feedback type medium oscillator is designed by using HFSS and ADS. HFSS is used to accurately simulate the coupling of dielectric resonators to microstrip lines; ADS is used to simulate non-linear oscillators to optimize phase noise and output power. In the design process, the low noise PHEMT transistor ATF-34143 is used as the oscillator active device, high Q value, high dielectric constant dielectric resonator as the frequency stabilization components, to determine the oscillator resonant frequency.