Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2005-01-11
2005-01-11
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C330S20700P
Reexamination Certificate
active
06842070
ABSTRACT:
Introduce a pulse length control mechanism to generate virtual multi-level output pulses for a Class-D Amplifier, which has only 2 physical output levels. Typically a Sigma-Delta-Modulator converts the input signal into high frequency low bit rate. The disclosed invention adds functions to transform the SDM signal into pulses with equivalent multi-level time-voltage areas and adds a pulse-length-control mechanism to produce various output pulse patterns, where the summations of the positive and negative pulses, within one sampling period, result in time-voltage area values, corresponding to 3 or more digital levels. Thus the invention produces higher signal quality at lower sampling rates.
REFERENCES:
patent: 4929947 (1990-05-01), Toyama
patent: 5406284 (1995-04-01), Lin et al.
patent: 5617058 (1997-04-01), Adrian et al.
patent: 5815102 (1998-09-01), Melanson
patent: 6009007 (1999-12-01), Pan
patent: 6127885 (2000-10-01), Colangelo
patent: 6232833 (2001-05-01), Pullen
patent: 6311046 (2001-10-01), Dent
patent: 6404280 (2002-06-01), Jeng
patent: 6466087 (2002-10-01), Ruha
patent: 910168 (1999-04-01), None
patent: 1227579 (2002-07-01), None
DS-02-012, U.S. Appl. No. 10/336,967, filed Jan. 6, 2003, “Linearization of a PDM Class-D Amplifier”.
DS-02-013, U.S. Appl. No. 10/350,836, filed Jan. 24, 2003, “Multi Level Class-D Amplifier by Means of 2 Physical Layers”.
DS-02-014, U.S. Appl. No. 10/304,784, filed Nov. 26, 2002, “Multi Level Class-D Amplifier by Means of 2 Physical Layers”.
U.S. Appl. No. Publication US 2002/0105377 A1 to Masuda et al., “Digital Power Amplifier,” Pub. date Aug. 8, 2002, filed Nov. 14, 2001.
Ackerman Stephen B.
Dialog Semiconductor GmbH
Nguyen Patricia
Saile George O.
LandOfFree
Multi-level Class-D amplifier by means of 2 physical layers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-level Class-D amplifier by means of 2 physical layers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-level Class-D amplifier by means of 2 physical layers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3392319