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请问一个DSP自身支持的穿越频率最高计算方法。使用TMS320F28027FPTT做PWM型开关电源控制芯片,时钟周期60MHz,开关电源工作频率200kHz,占空比调制方式调整输出增益。普通电压闭环,28027采样输出电压做PID控制,请问不考虑电源本身能支持的穿越频率,仅计算28027本身能支持多高的穿越频率计算?计算方式是什么?设计的最简洁的PID闭环算法程序运行一循环需要多少时间?感谢