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:
Nov. 25, 2008
Filed:
Apr. 30, 2007
Akira Seino, Kawasaki, JP;
Hiroaki Maeda, Kawasaki, JP;
Takashi Ono, Kawasaki, JP;
Yousuke Okazaki, Kawasaki, JP;
Akira Seino, Kawasaki, JP;
Hiroaki Maeda, Kawasaki, JP;
Takashi Ono, Kawasaki, JP;
Yousuke Okazaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention provides an amplifier unit including a carrier amplifier biased for Class A or Class AB operation; a peak amplifier biased for Class B or Class C operation, wherein an input signal is input to the carrier amplifier and the peak amplifier, and wherein output signals from the carrier amplifier and the peak amplifier are synthesized to output therefrom; a comparator configured to compare a gate bias voltage of a transistor device in the peak amplifier with a predetermined threshold voltage and output a first output signal; and a failure detection circuit configured to output a second output signal indicating presence or absence of failure, based on the first output signal received from the comparator.