Modulator for digital amplifier

Pulse or digital communications – Receivers

Reexamination Certificate

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Details

C320S145000, C327S026000, C327S031000, C327S036000, C332S109000, C370S205000, C370S212000, C375S238000

Reexamination Certificate

active

10205569

ABSTRACT:
A digital modulator for driving a digital amplifier. The digital modulator has a subtractor which receives a digital input signal. A filter amplifier receives the output of the filter amplifier and is tuned to an idle frequency of the digital modulator. The digital modulator includes a delay element and a digital comparator. The digital comparator receives the output from the filter and applies it to the delay element. A feedback loop couples the output of the delay element to the subtractor.

REFERENCES:
patent: 4179625 (1979-12-01), Carter
patent: 4390849 (1983-06-01), Miskin
patent: 4403197 (1983-09-01), Swanson
patent: 4884486 (1989-12-01), McClish
patent: RE33333 (1990-09-01), Taylor, Jr. et al.
patent: 5352986 (1994-10-01), Modgil et al.
patent: 5631592 (1997-05-01), Schwarz et al.
patent: 5729175 (1998-03-01), Ferrer
patent: 5777512 (1998-07-01), Tripathi et al.
patent: 5901176 (1999-05-01), Lewison
patent: 5959501 (1999-09-01), Chester et al.
patent: 5974089 (1999-10-01), Tripathi et al.
patent: 6107875 (2000-08-01), Pullen et al.
patent: 6107876 (2000-08-01), O'Brien
patent: 6111532 (2000-08-01), Hirano et al.
patent: 6124757 (2000-09-01), Newey
patent: 6229390 (2001-05-01), Delano et al.
patent: 6262632 (2001-07-01), Corsi et al.
patent: 6297692 (2001-10-01), Nielson
patent: 6344811 (2002-02-01), Melanson
patent: 6348836 (2002-02-01), Delano
patent: 6366970 (2002-04-01), Wolff et al.
patent: 6373898 (2002-04-01), Langer et al.
patent: 6396933 (2002-05-01), Jung et al.
patent: 6404367 (2002-06-01), Van der Zwan et al.
patent: 6414560 (2002-07-01), Delano
patent: 6414613 (2002-07-01), Midya et al.
patent: 6429737 (2002-08-01), O'Brien
patent: 2001/0030577 (2001-10-01), Stephens et al.
patent: 2002/0033734 (2002-03-01), Broadley
patent: 2002/0036579 (2002-03-01), Grosso et al.
patent: 2002/0053945 (2002-05-01), Putzeys
patent: 2002/0057082 (2002-05-01), Hwang
patent: 2002/0070799 (2002-06-01), Dahan et al.
patent: 2002/0075068 (2002-06-01), Hsu
patent: 2002/0075069 (2002-06-01), Karki et al.
patent: 2002/0084843 (2002-07-01), Ruha
Omid Oliaei; Clock Jitter Noise Spectra in Continuous-Time Delta-Sigma Modulators; IEEE International Symposium on Circuits and Systems 1999; May 30-Jun. 2, 1999; pp. 192-195.
Klugbauer-Heilmeier, “A Sigma Delta Modulated Switching Power Amp” Audio Engineering Society, 92ndConvention, pp. 1-10, fig. 1-8, (Mar. 24-27, 1992), Preprint 3227, Vienna.
Klugbauer-Heilmeier, “A Sigma-Delta Power Amplifier for Digital Input Signals,” Audio Engineering Society 102ndConvention, pp. 1-8, fig. 1-8, (Mar. 22-25, 1997), Preprint 4448, Munich, Germany.
Nielson, “Linearity and Efficiency Performance of Switching Audio Power Amplifier Outage Stages—A Fundamental Analysis,” Audio Engineering Society 105thConvention, pp. 1-25, fig. 1-19, (Sep. 26-29, 1998) Preprint 4838, San Francisco, California.
van der Zee, et al. “A High Efficiency Class D+Class AB Audio Power Bridge Amplifier,” Audio Engineering Society 105thConvention, pp. 1-8, fig. 1-12, (Sep. 26-29, 1998), Preprint 4777, San Francisco, California.
Floros et al., “A Distortion-Free PWM Coder For All-Digital Audio Amplifiers,” Audio Engineering Society 110thConvention, pp. 1-4, (May 12-15, 2001), Convention Paper 5361, Amsterdam, The Netherlands.
O'Brien, “Digital Class-D Subwoofer Amp, Pt. 1,” audioXpress, pp. 4, 26-33, vol. 32, No. 3 (Mar. 2001), Audio Amateur Corporation.
O'Brien, “Digital Class-D Subwoofer Amp, Pt. 2,” audioXpress, pp. 4, 44-47, vol. 32, No. 4 (Apr. 2001), Audio Amateur Corporation.
Esslinger et al., “Digital Audio Power Amplifiers Using Sigma Delta Modulation Linearity Problems In The Class-D Power Stage,” Audio Engineering Society 110thConvention, pp. 1-12 (May 12-15, 2001), Convention Paper 5400, Amsterdam, The Netherlands.
Berkhout, “Integrated Class D Amplifier,” Audio Engineering Society 112thConvention, pp. 1-6, (May 10-13, 2002), Convention Paper 5502, Munich, Germany.
van der Hulst et al., “An Asynchronous Switching High-End Power Amplifier,” Audio Engineering Society 112thConvention, pp. 1-7, (May 10-13, 2002), Convention Paper 5503, Munich, Germany.
R. Esslinger et al, “Distortions By Switching Errors In Digital Power Amplifiers Using Sigma Delta Coded Signals,” Audio Engineering Society 112thConvention, pp. 1-14, (May 10-13, 2002), Convention Paper 5633, Munich, Germany.
R. Esslinger et al, “Sigma-Delta Modulation In Digital Class-D Power Amplifiers: Methods For Reducing The Effective Pulse Transition Rate,” Audio Engineering Society 112thConvention, pp. 1-16, (May 10-13, 2002), Convention Paper 5634, Munich, Germany.

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