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Setting a Constant Duty Cycle
Setting a Constant Duty Cycle
Pulse-based Control Technique
这种技术将与任何GreenPak一起使用。
设置不可变占空比需要一个CNT / DLLY块,振荡器和DFF。宏小区应配置如图27所示。
图26 CNT / DLY配置
图27简单的占空比配置
振荡器确定时段,DFF是一个上升沿检测器,并且CNT / DLY块确定占空比。当来自振荡器的上升沿被DFF注册时,它将将LO脉冲发送到CNT / DLLY块。这将设置CNT / DLY输出LO,输出只会在延迟之后上升计数数据has been met.
从DFF的初始配置更改Q输出极性to倒(nQ)并连接DFF的输出。这将允许其作为上升沿检测器操作;它将保持良好,直到在时钟检测到上升沿,从而将其简要缩小到LO。这FILTER/EDGE DETblock can also be configured for this purpose.
这oscillatorOUT0或者OUT1连接到DFF的时钟输入以生成周期。期间应始终大于占空比。在此示例中,句点设置‘OUT1’ second divider by,被设定为OSC/64.
这CNT/DLY block’s计数数据选项设置占空比。延迟时间设置低信号的持续时间。占空比计算为:
图28占空比模拟= 50%