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本文结合一个典型线路对带有机械振子的自动稳零直流放大器的低频特性,进行了分析,并且着重分析了调制解调辅助放大器对缓变信号的频率响应.所用方法是差分方程求解法,因为用差分方程来描述具有机械振子的调制解调线路的固有工作过程,要比用相同的初始条件的微分方程来描述更为准确.文中推导出调制及解调线路的调制系数 k、解调系数 k 以及它们的传递函数.此外,对放大调制波的阻容耦合放大器也进行了分析.分析结果说明,如果放大器耦合回路的参数选择得合理时,则此放大器对缓变信号的调制波可作为理想放大器来处理.文中所得结果可作为设计该类型放大器时选择参数的参考.此外,本文对于采用自动稳零直流放大器作运算放大器时可能产生的持续低频自激振荡问题,也进行了讨论.
In this paper, the low frequency characteristics of an automatic balun DC amplifier with a mechanical oscillator are analyzed in combination with a typical circuit, and the frequency response of the modulation and amplifier auxiliary amplifier to the slowly changing signal is analyzed emphatically. The method used is the difference equation solving method because It is more accurate to describe the inherent work process of a modem line with a mechanical oscillator than a differential equation than a differential equation with the same initial condition.The modulation coefficient k of the modulation and demodulation line is derived and the demodulation coefficient k and their transfer functions are also discussed.In addition, the analysis of the RC amplifier with amplifying modulation wave also shows that, if the parameters of the amplifier coupling loop are chosen reasonably, the amplifier can modulate the modulated signal of the slowly changing signal as Ideal amplifier to deal with the results obtained in this paper can be used as a reference for the selection of parameters when designing this type of amplifier.In addition, this paper discusses the continuous low-frequency self-oscillation problem that may occur when using an auto-zeroing DC amplifier as an operational amplifier.