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本文提出了对体效应振荡器进行方波调制的一种方法,在体效应振荡腔内按装上一只变容二积管,当变容管之偏压变化时,振荡器的输出功率和工作频率均随着变化,因此,当在变容管两端加上一定幅度的方波时,振荡器输出就有了一定的幅度调制。这时,输出方波有两个信号;位于顶部的信号和位于底部的信号,两者的幅差一般为1—2db,频率差一般为20—40MH_z,利用反应式谐振系统使底部(即较低电平)信号被吸收,而顶部(较高电平)信号无阻地通过,从而使调制度加大,一般约为9db,增加谐振系统的级数可以增加调制度,实验在三公分波段进行,工作带宽决定于体效应振荡器本身带宽以及谐振系统的可调范围,对调制后的工作稳定性问题进行了实验研究和讨论。
In this paper, a method of square-wave modulation of body-effect oscillator is proposed. A varactor is mounted in the body-effect oscillator. When the bias of the varactor changes, the output power of the oscillator and Operating frequency varies with, therefore, when the varactor at both ends plus a certain degree of square wave, the oscillator output has a certain amplitude modulation. At this time, the output square wave has two signals; at the top of the signal and the signal at the bottom of the amplitude is generally 1-2db, the frequency difference is generally 20-40MH_z, the use of reactive resonance system to the bottom (ie, Low level) signal is absorbed, while the top (higher level) signal unimpeded through, resulting in increased modulation, usually about 9db, increasing the number of stages of the resonant system can increase the modulation, the experiment carried out in the third centimeter band The working bandwidth depends on the bandwidth of the body effect oscillator itself and the adjustable range of the resonant system. The stability of the modulated system is experimentally studied and discussed.