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. 19, 2013
Filed:
Feb. 03, 2009
Akihiro Kanbe, Kiryu, JP;
Masato Kaneta, Kiryu, JP;
Haruo Kobayashi, Kiryu, JP;
Hitoshi Hirata, Osaka, JP;
Tatsuhiro Shimura, Osaka, JP;
Akihiro Kanbe, Kiryu, JP;
Masato Kaneta, Kiryu, JP;
Haruo Kobayashi, Kiryu, JP;
Hitoshi Hirata, Osaka, JP;
Tatsuhiro Shimura, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An envelope tracking power supply circuit is a power supply circuit for generating an output voltage according to the envelope of a high frequency signal and includes a voltage follower circuit for receiving an envelope signal and outputting a voltage according to the envelope signal; two parallel resistors connected in parallel between the output of the voltage follower circuit and an output terminal; hysteresis comparators for detecting respective voltage drops in the parallel resistors and generating voltages according to the voltage drops; and switching converters for performing switching according to the respective voltages outputted from the hysteresis comparators and outputting a voltage to the output terminal.