Balanced, floating, spread-spectrum pulse width modulator...

Details Balanced, floating, spread-spectrum pulse width modulator... Balanced, floating, spread-spectrum pulse width modulator...

2007-01-30

2007-01-30

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C330S251000

Reexamination Certificate

active

10871735

ABSTRACT:
A fully differential class D amplifier includes a pulse width modulator and a power stage. The pulse width modulator is arranged to employ a differential output signal provided from the power stage as a feedback signal. The pulse width modulator includes a transimpedance amplifier that is arranged to generate a triangle wave from the input signal and the feedback signal. The transimpedance amplifier is arranged to generate the triangle wave such that the triangle wave that has approximately a 50% duty cycle when no input signal is applied. Additionally, the input signal adjusts the frequency of the triangle wave such that the triangle wave is a spread spectrum signal. The triangle wave is compared to a threshold signal to provide a pulse width modulated signal.

REFERENCES:
patent: 4531096 (1985-07-01), Yokoyama
patent: 5229929 (1993-07-01), Shimizu et al.
patent: 6215290 (2001-04-01), Yang et al.
patent: 6317340 (2001-11-01), Niederreiter
patent: 6465993 (2002-10-01), Clarkin et al.
patent: 6489841 (2002-12-01), Takagishi
patent: 7038534 (2006-05-01), Hanzlik

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