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:
Mar. 01, 2016
Filed:
Aug. 13, 2013
Applicant:
Analog Devices, Inc., Norwood, MA (US);
Inventors:
William T. Boles, Greensboro, NC (US);
Michael R. Elliott, Summerfield, NC (US);
Assignee:
ANALOG DEVICES, INC., Norwood, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/68 (2006.01); H02M 3/156 (2006.01); H03B 5/12 (2006.01); G05F 3/26 (2006.01); H03F 3/16 (2006.01);
U.S. Cl.
CPC ...
H02M 3/156 (2013.01); G05F 3/262 (2013.01); H03B 5/12 (2013.01); H03F 3/16 (2013.01); H03F 3/68 (2013.01);
Abstract
In one aspect, a current source is provided to limit noise and offset. In one embodiment, a source transistor is provided, with current sourced at the drain. A feedback network runs from the source node to the gate. The feedback network produces voltage gain by a transconductance, such as a transistor. Appropriate capacitors are also provided, and two pairs of switches are disposed to provide offset cancellation by toggling between gain and clamp modes in the switched capacitor architecture.