Invention Grant
US07679464B2 Method and apparatus for frequency modulating a periodic signal of varying duty cycle
有权
用于频率调制变化占空比的周期信号的方法和装置
- Patent Title: Method and apparatus for frequency modulating a periodic signal of varying duty cycle
- Patent Title (中): 用于频率调制变化占空比的周期信号的方法和装置
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Application No.: US12074459Application Date: 2008-03-03
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Publication No.: US07679464B2Publication Date: 2010-03-16
- Inventor: Dan Ion Hariton , Narendar Venugopal
- Applicant: Dan Ion Hariton , Narendar Venugopal
- Agent Harris Zimmerman; Howard Cohen
- Main IPC: H03K3/02
- IPC: H03K3/02 ; H03K7/08
Abstract:
A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal to generate a spread spectrum carrier signal; and, 3) retiming a PWM signal with this high frequency SS carrier signal so that the binary transitions of the PWM signal are aligned with the frequency varying carrier signal. In another embodiment, a PWM oscillator is driven by a second, FM oscillator having spread spectrum characteristics. In another embodiment a PWM oscillator is driven and modulated by a counter/frequency divider comprised of modules.
Public/Granted literature
- US20080157894A1 Method and apparatus for frequency modulating a periodic signal of varying duty cycle Public/Granted day:2008-07-03
Information query
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