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:
Sep. 22, 2015
Filed:
Aug. 27, 2013
Applicant:
Analog Devices, Inc., Norwood, MA (US);
Inventor:
Daniel F. Kelly, Andover, MA (US);
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 1/22 (2006.01); H03F 3/45 (2006.01); H03F 3/68 (2006.01); H03G 3/00 (2006.01);
U.S. Cl.
CPC ...
H03F 1/22 (2013.01); H03F 1/223 (2013.01); H03F 3/45179 (2013.01); H03F 3/45188 (2013.01); H03F 3/68 (2013.01); H03G 3/004 (2013.01);
Abstract
An example embodiment of an active cascode circuit has a control circuit for control of the gate to source voltage (VGS) of at least one transistor in the active cascode circuit. The embodiment may be configured so that control of the VGS also controls the voltage Vin on the input. Vin may be adjusted without altering the device geometry or changing the drain current. This allows for better control and optimization of available headroom for the input voltage in low voltage designs and also results in higher active cascode circuit bandwidth and/or higher output impedance (Rout) for a given power level.