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:
Jul. 23, 2013
Filed:
May. 19, 2011
Hannu T. Laurila, Oulu, FI;
Hannu T. Laurila, Oulu, FI;
Nokia Corporation, Espoo, FI;
Abstract
A radio signal is input to a first terminal and output after amplification at a second terminal. There is a third terminal which is common to both the first and the second terminal. There is an inductance interfacing the second terminal to a direct current power supply; and a radio frequency filter connected in shunt with the inductance. In an exemplary embodiment the first, second and third terminals are respective base, collector and emitter terminals of a bipolar transistor. Such a bipolar transistor is characterized in that voltage from the power supply passes to the second terminal through the inductance but not through the radio frequency filter; and the signal output passes from the second terminal through the radio frequency filter but not through the inductance. The illustrated embodiments show the radio frequency filter as a surface acoustic wave filter in direct connection with the second terminal.