Circuit and method for pulse width modulation

Details Circuit and method for pulse width modulation Circuit and method for pulse width modulation

2008-06-24

2008-06-24

Pascal, Robert J. (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Pulse width modulator

C375S238000

Reexamination Certificate

active

07391280

ABSTRACT:
A circuit and a method for performing pulse width modulation are provided. A pulse density modulator (PDM) is applied to receive the least N bits of the input data and to generate a pulse density modulation signal. The number of pulse of the pulse density modulation signal in 2^N frames correspond to a value of the least N bits of the input data. An adder is applied to generate a PWM data by adding a value of the most M bits of the input data to a value of the pulse density modulation signal generated by the PDM. A pulse width modulator is applied to generate a PWM signal dithering in 2^N frames according to the PWM data generated by the adder, so as to improve the audio quality of pulse width modulation and the Electro-Magnetic Interference (EMI) phenomenon.

REFERENCES:
patent: 4772833 (1988-09-01), Tanaka
patent: 5177373 (1993-01-01), Nakamura
patent: 6281822 (2001-08-01), Park

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