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TMS320F2800137: 锁相环软件设计仿真--频移

Part Number: TMS320F2800137

在锁相环软件设计的仿真中,频移的仿真结果相位没有完全重合,请问这是正常的吗?以下是我截取文档https://www.ti.com.cn/cn/lit/pdf/sprabt3?keyMatch=SOFTWARE%20PHASE%20LOCKED%20LOOP%20DESIGN的图片,黄色框内是我不明白的。

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