我们将讨论诸如匹配，重整化，算符乘积展开，幂次计数，和重整化群跑动等概念。
Concepts such as matching, renormalization, the operator product expansion, power counting, and running with the renormalization group will be discussed.
假设高信号使能，计数器每个时钟周期进行计数，PWM输出的频率为时钟频率的2次幂分频。
Suppose that Enable is high, the counter counts up every clock cycle, and the frequency of the PWM output is the clock frequency divided by 2 count bits.
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