二是正弦波网络：主要包括正弦量化的电流源整列和开关网络，电流电压转换器，二阶低通滤波器；
The second part is to design the sine wave networks circuits which is composed of sinusoidal current source array and switches, current to voltage converter (I-V converter), two staged LPF, etc.
输出电流为正弦波，不包括多余的高次谐波。
Output current is sine wave and does not include unnecessary high harmonic wave.
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