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:
May. 23, 2017
Filed:
Jun. 17, 2015
Applicant:
Qualcomm Incorporated, San Diego, CA (US);
Inventors:
Assignee:
QUALCOMM Incorporated, San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/02 (2006.01); H03F 3/21 (2006.01); H03F 3/19 (2006.01); H03F 3/45 (2006.01); H03F 3/24 (2006.01); H03F 3/30 (2006.01);
U.S. Cl.
CPC ...
H03F 1/0205 (2013.01); H03F 3/19 (2013.01); H03F 3/211 (2013.01); H03F 3/245 (2013.01); H03F 3/3022 (2013.01); H03F 3/45192 (2013.01); H03F 3/45219 (2013.01); H03F 3/45654 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H03F 2203/21106 (2013.01); H03F 2203/30015 (2013.01); H03F 2203/45008 (2013.01); H03F 2203/45134 (2013.01);
Abstract
A class AB amplifier may include an input stage, a first folded cascode stage, a second folded cascode stage, and a class AB output stage. In some embodiments, the class AB output stage may provide differential output signals. The common-mode voltage of the differential output signals may be controlled via a correction signal coupled to a selected folded cascode stage. The correction signal may control the common-mode voltage of the differential output signals by altering bias currents within the selected folded cascode stage. The other cascode stage may include bias currents controlled by relatively fixed bias voltages.