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:
Apr. 25, 2017
Filed:
Jan. 31, 2014
Applicant:
Nujira Limited, Cambourne, Cambridge Cambridgeshire, GB;
Inventor:
Gerard Wimpenny, Cambridgeshire, GB;
Assignee:
SnapTrack, Inc., San Diego, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G 3/20 (2006.01); H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03F 3/21 (2006.01); H03F 3/217 (2006.01); H04W 52/02 (2009.01);
U.S. Cl.
CPC ...
H03F 1/0211 (2013.01); H03F 1/0227 (2013.01); H03F 3/19 (2013.01); H03F 3/211 (2013.01); H03F 3/217 (2013.01); H04W 52/0251 (2013.01); H03F 2200/102 (2013.01); H03F 2200/135 (2013.01); H03F 2200/451 (2013.01); H03F 2203/21106 (2013.01); Y02B 60/50 (2013.01);
Abstract
There is disclosed an envelope tracking power supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a first path for tracking low frequency variations in the reference signal and a second path for tracking high frequency variations in the reference signal, the second path including a linear amplifier, wherein the output of the linear amplifier comprises a current source and a current sink connected to the high frequency output, there further being provided a DC offset current at the high frequency output.