The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2020
Filed:
Dec. 04, 2018
Cree, Inc., Durham, NC (US);
CREE, INC., Durham, NC (US);
Abstract
A Doherty amplifier includes a metal baseplate having a die attach region and a peripheral region; a main amplifier and one or more peaking amplifiers, each amplifier comprising a transistor die that includes at least one RF terminal; and a multilayer circuit board having a first side attached to the peripheral region and a second side facing away from the baseplate. The circuit board includes two embedded electrically conductive layers separated from the two sides by respective composite fiber layers, and an embedded dielectric layer disposed between the embedded electrically conductive layers and having a higher dielectric constant than either of the composite fiber layers. The Doherty amplifier also includes an RF impedance matching network that is electrically connected to an RF terminal of at least one amplifier transistor die, and that comprises one or more reactive components formed from at least one of the embedded electrically conductive layers.