公开(公告)号：US6150963A

公开(公告)日：2000-11-21

申请号：US304678

申请日：1999-05-04

申请人： Michele Boscolo ,  Ezio Galbiati ,  Marco Vitti

发明人： Michele Boscolo ,  Ezio Galbiati ,  Marco Vitti

IPC分类号： H03M5/08

CPC分类号： H03M5/08

摘要： A method and system produce a PWM signal using a comparator having first and second input terminals and an output terminal at which the PWM signal is produced. The method includes powering the comparator with a supply voltage and receiving a modulating signal at the first input terminal. The method creates a carrier signal with a constant frequency and a maximum amplitude equal to the supply voltage. The comparator receives the carrier signal at the second input terminal and compares the carrier signal to the modulating signal, thereby producing the PWM signal at the output terminal. By creating and using a carrier signal with a maximum amplitude equal to the supply voltage, the PWM signal produced by the method is immune from changes in the supply voltage.

摘要翻译： 方法和系统使用具有第一和第二输入端的比较器和产生PWM信号的输出端产生PWM信号。 该方法包括用比较器供电并在第一输入端接收调制信号。 该方法产生具有等于电源电压的恒定频率和最大振幅的载波信号。 比较器在第二输入端接收载波信号，并将载波信号与调制信号进行比较，从而在输出端产生PWM信号。 通过产生和使用具有等于电源电压的最大幅度的载波信号，由该方法产生的PWM信号免于电源电压的变化。