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. 13, 2011
Filed:
Dec. 30, 2009
Applicants:
Mats Carlsson, Sundbyberg, SE;
Daniel Bjork, Sollentuna, SE;
Inventors:
Mats Carlsson, Sundbyberg, SE;
Daniel Bjork, Sollentuna, SE;
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
An output-impedance in a power amplifier is provided. A first transistor Qof a buffer stage is connected to a first side of a resistor Rand a second transistor Qto a second opposite side of the resistor R. The first transistor feeds a current Ito the second resistor Q. The current Iat the second transistor is copied and multiplied by a factor (n) to form an output current I, as (1+n)*I. The current Iis fed back to the first transistor and the output current Iis fed to a load resistor R.