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. 10, 2015
Filed:
Dec. 04, 2012
Samsung Electro-mechanics Co., Ltd., Gyeonggi-do, KR;
Yoo Hwan Kim, Gyeonggi-do, KR;
Yoo Sam Na, Seoul, KR;
Hyeon Seok Hwang, Seoul, KR;
Byeong Hak Jo, Gyeonggi-do, KR;
Hyun Hwan Yoo, Gyeonggi-do, KR;
Samsung Electro-Mechanics Co., Ltd., Gyeonggi-do, KR;
Abstract
Disclosed herein is a circuit for preventing an element from being damaged although output impedance of a final transistor is changed in a power amplifier. The power amplifier includes: a power stage amplifying a signal; a transformer connected to an output terminal of the power stage and coupling a signal output from the power stage; and a controller controlling a bias voltage from the power stage according to the coupled signal. Although output impedance is changed, damage to the power amplifier can be prevented. Also, the power amplifier can be automatically controlled to maintain performance thereof by sensing an operational state in which output impedance is normal.