为何音频电路仅需要单级放大电路，而影像电路必须两级反向。
Why audio buffer needs only one stage while video buffer needs two stages for amplification?
没有反馈电阻的仪表放大器提供精确增益，无论增益多大，放大器的同向和反向输入端提供高输入阻抗。
An instrumentation amplifier offers precise gain without feedback resistors, and, at any value of gain, it provides high input impedances at its noninverting and inverting inputs.
研究了反向泵浦光纤喇曼放大器中泵浦和信号相互作用的数值求解方法。
The numerical method to calculate the signal and pump interaction in back pumped fiber Raman amplifier is present.
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