Elimination of pop-up noise in class D amplifier

Details Elimination of pop-up noise in class D amplifier Elimination of pop-up noise in class D amplifier

2006-07-31

2008-10-07

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P

Reexamination Certificate

active

07432759

ABSTRACT:
A class D amplifier includes a driver circuit and a reset circuit. The driver circuit is configured to amplify a PWM (pulse width modulation) signal to generate an amplified PWM signal. The reset circuit applies a predetermined voltage at an input of the driver circuit for a time period after a power supply voltage is applied or before the power supply voltage is deactivated, for eliminating pop-up noise.

REFERENCES:
patent: 6781458 (2004-08-01), Mazda
patent: 7078963 (2006-07-01), Andersen et al.
Korean Patent Application No. 1020030013726 to Yasuomi, having Publication date of Sep. 19, 2003 (w/ English Abstract page).
Japanese Patent Application No. 2000-029375 to Shigeaki, having Publication date of Aug. 17, 2001 (w/ English Abstract page).
Japanese Patent Application No. 2001-312301 to Shigeru, having Publication date of Apr. 25, 2003 (w/ English Abstract page).
Japanese Patent Application No. 2002-001276 to Kunihiko, having Publication date of Jul. 18, 2003 (w/ English Abstract page).
Korean Patent Application No. 1020020054939 to Jang et al., having Publication date of Mar. 18, 2004 (w/ English Abstract page).
Soo-hyoung Lee et al., “A 2W, 92% Efficiency and 0.01% THD+N Class-D Audio Power Amplifier for Mobile Applications, based on the Novel SCOM Architecture”, IEEE 2004 Custom Integrated Circuits Conference, pp. 291-294.

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