The idea behind the constant current load is that with a constant current load, the valve is almost perfectly linear (near ZERO distortion).
恒流源负载的思路取自胆管在恒流源负载的条件下可以接近完美的线性（接近零失真）。
This crossover distortion looks like a notch, or flat spot, in the sine wave as it crosses the zero axis.
这交越失真看起来像一个档次，或扁平点，在正弦波作为穿越零轴。
The result has precisely zero phase distortion and magnitude modified by the square of the filter's magnitude response.
其结果是相位特性精确的为零，没有变形并且幅频特性被滤波器幅频特性的平方所改变。
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