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:
Jan. 03, 2017
Filed:
Dec. 02, 2014
Applicant:
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Inventor:
Shingo Inoue, Yokohama, JP;
Assignee:
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/04 (2006.01); H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03F 3/217 (2006.01);
U.S. Cl.
CPC ...
H03F 1/0233 (2013.01); H03F 1/0222 (2013.01); H03F 3/19 (2013.01); H03F 3/217 (2013.01); H03F 2200/102 (2013.01); H03F 2200/432 (2013.01); H03F 2200/451 (2013.01); H03F 2200/504 (2013.01);
Abstract
An RF amplifier with enhance power efficiency is disclosed. The RF amplifier traces the envelope of the input RF signal and varies the supply voltage to the final FET depending on the detected envelope through a linear power supply and a switching power supply superposed on the linear power supply. The linear power supply promptly responds the change of the envelope and gradually decreases the supply current as maintaining the supply voltage. The switching power supply takes over the supplement of the supply current to the final FET.