Modulators inventions 07/08

20080164958 - Method and apparatus for pulse width modulation: There is described a method and an apparatus for pulse width modulation with a predefined switching period having an adjustable ratio of the switch-on duration to the switch-off duration, in which a quantized signal is converted into a pulse-width-modulated signal and is generated in the form of a discrete pulse... Agent: Siemens Corporation Intellectual Property Department

20080157894 - Method and apparatus for frequency modulating a periodic signal of varying duty cycle: 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... Agent: Zimmerman & Cronen, LLP

20080157895 - Multi-mode amplitude modulator control method: A power management device providing a power amplifier with power supply voltage is provided. The power management unit includes a parallel-hybrid amplitude modulator apparatus having a linear part configured to track frequency components of an input signal above a determined threshold frequency and a switching part arranged in parallel with... Agent: Squire, Sanders & Dempsey L.l.p.