Title:
DIGITAL SWITCHING POWER AMPLIFIER
Document Type and Number:
WIPO Patent Application WO2004102790
Kind Code:
A3
Abstract:
Apparatus for transmitting a collimated and directed beam of wave energy which includes a beam-forming network having a plurality of amplification sections coupled to an array of transmitting elements. Each one of the sections includes: a source of digital samples of the wave energy; a digital filter fed by digital samples for providing a time delay to the replica; and an amplification system. The amplification system includes: a bridge amplifier producing a feedback signal representative of current passing through a bridge circuit; an analog to digital converter section to produce a corresponding digital feedback signal; a digital summer fed by digital samples of a signal to be amplified and by the digital feedback signal for producing a composite digital signal; and a modulator section fed by the composite digital signal and the carrier signal source produced signal for producing the plurality of switching signals for the amplifying elements.
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Inventors:
HABBOOSH NAMIR W (US)
COHEN MARTIN L (US)
COHEN MARTIN L (US)
Application Number:
PCT/US2004/015072
Publication Date:
December 23, 2004
Filing Date:
May 13, 2004
Export Citation:
Assignee:
RAYTHEON CO (US)
HABBOOSH NAMIR W (US)
COHEN MARTIN L (US)
HABBOOSH NAMIR W (US)
COHEN MARTIN L (US)
International Classes:
H03F3/217; (IPC1-7): H03F3/217
Foreign References:
| US6107876A | 2000-08-22 | |||
| US6466087B2 | 2002-10-15 | |||
| US4773096A | 1988-09-20 |
Other References:
TAKANO H ET AL: "Multiple-bridge PWM current-regulated power amplifier for magnetic resonance imaging system and its feasible digital control implementation", INDUSTRIAL ELECTRONICS SOCIETY, 1999. IECON '99 PROCEEDINGS. THE 25TH ANNUAL CONFERENCE OF THE IEEE SAN JOSE, CA, USA 29 NOV.-3 DEC. 1999, PISCATAWAY, NJ, USA,IEEE, US, 29 November 1999 (1999-11-29), pages 785 - 790, XP010366646, ISBN: 0-7803-5735-3
SMITH K M ET AL: "Realization of a digital PWM power amplifier using noise and ripple shaping", POWER ELECTRONICS SPECIALISTS CONFERENCE, 1995. PESC '95 RECORD., 26TH ANNUAL IEEE ATLANTA, GA, USA 18-22 JUNE 1995, NEW YORK, NY, USA,IEEE, US, 18 June 1995 (1995-06-18), pages 96 - 102, XP010150544, ISBN: 0-7803-2730-6
WATANABE S ET AL: "Digitally-controlled optimum current tracking scheme of two-paralleled high-power PWM amplifier for magnetic resonance imaging", POWER ELECTRONICS SPECIALISTS CONFERENCE, 1997. PESC '97 RECORD., 28TH ANNUAL IEEE ST. LOUIS, MO, USA 22-27 JUNE 1997, NEW YORK, NY, USA,IEEE, US, 22 June 1997 (1997-06-22), pages 686 - 691, XP010241617, ISBN: 0-7803-3840-5
SMITH K M ET AL: "Realization of a digital PWM power amplifier using noise and ripple shaping", POWER ELECTRONICS SPECIALISTS CONFERENCE, 1995. PESC '95 RECORD., 26TH ANNUAL IEEE ATLANTA, GA, USA 18-22 JUNE 1995, NEW YORK, NY, USA,IEEE, US, 18 June 1995 (1995-06-18), pages 96 - 102, XP010150544, ISBN: 0-7803-2730-6
WATANABE S ET AL: "Digitally-controlled optimum current tracking scheme of two-paralleled high-power PWM amplifier for magnetic resonance imaging", POWER ELECTRONICS SPECIALISTS CONFERENCE, 1997. PESC '97 RECORD., 28TH ANNUAL IEEE ST. LOUIS, MO, USA 22-27 JUNE 1997, NEW YORK, NY, USA,IEEE, US, 22 June 1997 (1997-06-22), pages 686 - 691, XP010241617, ISBN: 0-7803-3840-5
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