Source: http://www.google.com/patents/US6285251?dq=7,362,867
Timestamp: 2013-12-12 12:02:15
Document Index: 341155185

Matched Legal Cases: ['application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09']

Patent US6285251 - Amplification systems and methods using fixed and modulated power supply ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA signal of varying amplitude in a first saturated power amplifier that operates from a fixed voltage power supply to produce a first output signal of constant amplitude. The signal of varying amplitude also is amplified in a second saturated power amplifier that operates from a modulated voltage power...http://www.google.com/patents/US6285251?utm_source=gb-gplus-sharePatent US6285251 - Amplification systems and methods using fixed and modulated power supply voltages and buck-boost controlPublication numberUS6285251 B1Publication typeGrantApplication numberUS 09/640,408Publication dateSep 4, 2001Filing dateAug 17, 2000Priority dateApr 2, 1998Fee statusPaidAlso published asCN1264274C, CN1493106A, CN1893258A, CN100557948C, DE60140381D1, EP1364456A2, EP1364456B1, US6369651, US20010030581, WO2002015387A2, WO2002015387A3Publication number09640408, 640408, US 6285251 B1, US 6285251B1, US-B1-6285251, US6285251 B1, US6285251B1InventorsPaul Wilkinson Dent, William O. Camp, Jr.Original AssigneeEricsson Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (54), Non-Patent Citations (13), Referenced by (71), Classifications (39), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetAmplification systems and methods using fixed and modulated power supply voltages and buck-boost controlUS 6285251 B1Abstract A signal of varying amplitude in a first saturated power amplifier that operates from a fixed voltage power supply to produce a first output signal of constant amplitude. The signal of varying amplitude also is amplified in a second saturated power amplifier that operates from a modulated voltage power supply, to produce a second output signal of amplitude that depends on the signal of varying amplitude, a modulated power supply voltage, and on an invert/noninvert control signal. The first and second output signals are combined into a load. The modulated voltage power supply is modulated while generating the invert/noninvert control signal, such that the combined first and second output signals into the load amplify the signal of varying amplitude. The signal of varying amplitude also may be of varying amplitude and varying phase.
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KgDoherty amplifier with optimised efficiency* Cited by examinerClassifications U.S. Classification330/127, 330/124.00RInternational ClassificationH03F3/04, H02M3/158, H03F1/02, H03G3/00, H03F3/68, H03F, H03F1/32, H04L27/20, H03F3/217, H03F3/189Cooperative ClassificationH03F2200/543, H03F1/0288, H03G3/004, H03F2200/504, H03F1/0227, H03F2200/331, H03G3/3042, H03F2200/336, H03F2200/432, H03F2200/324, H03F2200/198, H03F2203/21142, H03F1/0294, H03F3/211, H03F2200/516, H03F3/602, H02M3/1582, H03F2200/537, H03F2200/541European ClassificationH02M3/158B, H03F1/02T5, H03F1/02T1C1K, H03F1/02T6, H03G3/30D2, H03F3/21C, H03F3/60C, H03G3/00PLegal EventsDateCodeEventDescriptionMar 4, 2013FPAYFee paymentYear of fee payment: 12Mar 4, 2009FPAYFee paymentYear of fee payment: 8Mar 4, 2005FPAYFee paymentYear of fee payment: 4Aug 17, 2000ASAssignmentOwner name: ERICSSON INC., NORTH CAROLINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DENT, PAUL WILKINSON;CAMP, WILLIAM O., JR.;REEL/FRAME:011026/0049;SIGNING DATES FROM 20000808 TO 20000811Owner name: ERICSSON INC. 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