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本文以负阻振荡理论为基础,首先将晶体管以y参数四端网络表示,再和LC回路并联。若在一定条件下,该四端网络输出端能呈现负电导,且其绝对值大于负载电导,同时该四端网络输出端的电纳和负载电纳共轭。则该电路就能形成振荡器。文中对负电导形成的规律进行了探讨,得出一套设计振荡器的方法。该法适用于一般高频振荡器及引信自差收发机的设计,特别对超高频波段,晶体管y参数可由测量S参数换算而来,故克服了不易直接测准的缺点。本设计方法物理概念清晰、操作简易、精度高。
In this paper, based on the theory of negative resistance oscillation, the transistor is first represented by a four-terminal network of y-parameters and then in parallel with the LC loop. Under certain conditions, the four-terminal network output can exhibit negative conductance, and its absolute value is greater than the load conductance, while the susceptance and load susceptance conjugation at the output of the four-terminal network are both satisfied. The circuit can form an oscillator. In this paper, the formation of negative conductance was discussed, and a set of methods for designing the oscillator was obtained. This method is suitable for the design of general high-frequency oscillators and fuses self-disproportionated transceivers. Especially for the ultra-high frequency band, the y-parameters of the transistors can be converted from the measured S-parameters, thus overcoming the disadvantage that it is not easy to directly measure. The physical design of this concept is clear, easy to operate, high precision.