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简要介绍一种将方波信号分频，再经低通滤波器ＭＡＸ２９１滤波，构成输出频率稳定准确的正弦波发生器的硬件组成和工作原理。
A brief introduction to a square wave signal frequency, and then filtered by the low-pass filter MAX291 constitute a stable and accurate output frequency of the sine wave generator hardware components and working principle.