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公开(公告)号:US06822588B1
公开(公告)日:2004-11-23
申请号:US10825577
申请日:2004-04-15
IPC分类号: H03M700
CPC分类号: H03M7/165
摘要: Pulse width modulation systems and methods are described. In one aspect, a pulse width modulation system includes a register and a code word generator. The code word generator has an input for receiving a specified output frequency and a specified duty cycle and is operable to generate code words of different lengths. The code word generator is operable to generate a base code word having a length set to achieve the specified output frequency and having a thermometer code value set in accordance with the specified duty cycle. The code word generator is further operable to load the register with a code word pattern including a sequence of one or more copies of the base code word.
摘要翻译: 描述了脉宽调制系统和方法。 一方面,脉宽调制系统包括寄存器和码字发生器。 码字生成器具有用于接收指定的输出频率和指定的占空比的输入,并且可操作以产生不同长度的码字。 码字生成器可操作以产生具有设定长度的基本码字,以实现指定的输出频率并具有根据指定的占空比设置的温度计代码值。 代码字产生器还可操作以用包括基本代码字的一个或多个副本的序列的代码字模式加载寄存器。