Wolfspeed, Inc.
RADIO FREQUENCY AMPLIFIERS HAVING IMPROVED SHUNT MATCHING CIRCUITS

Abstract:

RF amplifiers are provided that include a submount such as a thermally conductive flange. A dielectric substrate is mounted on an upper surface of the submount, the dielectric substrate having a first outer sidewall, a second outer sidewall that is opposite and substantially parallel to the first outer sidewall, and an interior opening. An RF amplifier die is mounted on the submount within the interior opening of the dielectric substrate, where a longitudinal axis of the RF amplifier die defines a first axis. The RF amplifier die is positioned so that a first angle defined by the intersection of the first axis with the first outer sidewall is between 5.degree. and 45.degree.. The dielectric substrate may be a ceramic substrate or a dielectric layer of a printed circuit board.