Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2007-03-28
2009-06-02
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S010000, C330S099000
Reexamination Certificate
active
07541869
ABSTRACT:
A feedback architecture for a PWM switching audio amplifier is, capable of compensating the effects of the demodulation filter through at least two feedback paths of the voltage applied to a load without degrading the overall loop gain of the device. Each of the feedback paths may include a respective network or filter for compensating a respective frequency pole of the cascade low-pass filter+load and establishing a certain band pass. These networks or filters may be passive networks.
REFERENCES:
patent: 4456872 (1984-06-01), Froeschle
patent: 6297692 (2001-10-01), Nielsen
patent: 6414560 (2002-07-01), Delano
patent: 6476673 (2002-11-01), Takagishi
patent: 7002406 (2006-02-01), Risbo et al.
patent: 7391257 (2008-06-01), Denison et al.
patent: 1630954 (2006-03-01), None
patent: WO2004047286 (2004-06-01), None
patent: WO2004/100356 (2004-11-01), None
“A Novel Audio Power Amplifier Topology with High Efficiency and State-of-the-Art Performance”, Frederiksen et al., 109thAES Convention, Sep. 22-25, 2000, Los Angeles, CA USA, 26 pages.
“High Fidelity Pulse Width Amplifiers based on Novel Double Loop Feedback Techniques”, Anderskouv et al., 100thAES Convention, May 11-14, 1996, Copenhagen, 18 pages.
“An Asynchronous Switching High-End Power Amplifier”, vane der Hulst et al., 112thAES Convention, May 10-13, 2002, Munich, Germany, 6 pages.
“Small-Signal Modeling of Pulse-Width Modulated Switched-Mode Power Converters”, Middlebrook, Proceedings of the IEEE, vol. 76, pp. 343-354, No. 4., Apr. 1988.
Adduci Pietro Mario
Botti Edoardo
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Jorgenson Lisa K.
Nguyen Patricia
STMicroelecronics S.r.l.
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