PWM modulator and class-D amplifier having the same

Details PWM modulator and class-D amplifier having the same PWM modulator and class-D amplifier having the same

2006-12-15

2008-08-26

Choe, Henry K (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07417497

ABSTRACT:
A pulse width modulation (PWM) modulator includes an integrator generating an integrated signal based on an input signal and an output signal, a low pass filter (LPF) receiving the integrated signal and performing low pass filtering, a comparator receiving an output signal of the LPF and a predetermined reference signal, comparing the received signals, and outputting a PWM signal, a dead time setup block outputting a first signal and a second signal having a predetermined phase difference therebetween based on the PWM signal, and a power stage buffering the first and second signals and generating the output signal based on a result of buffering. In the PWM modulator and a class-D amplifier having the PWM modulator, EMI can be reduced.

REFERENCES:
patent: 6362683 (2002-03-01), Miao et al.
patent: 6882225 (2005-04-01), Deletraz
patent: 7248193 (2007-07-01), Fujimoto
patent: 7262658 (2007-08-01), Ramaswamy et al.
patent: 7271650 (2007-09-01), Lee
patent: 2004/0232978 (2004-11-01), Easson et al.
patent: 2005229306 (2005-08-01), None
patent: 1020050000423 (2005-01-01), None

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