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:
Jun. 06, 2006
Filed:
Jun. 19, 2002
Robert-grant Irvine, Greensboro, NC (US);
Harald Pretl, Schwertberg, AT;
Claus Stoeger, Linz, AT;
Wolfgang Thomann, Linz, AT;
Robert-Grant Irvine, Greensboro, NC (US);
Harald Pretl, Schwertberg, AT;
Claus Stoeger, Linz, AT;
Wolfgang Thomann, Linz, AT;
Infineon Technologies AG, Munich, DE;
Abstract
A low-noise amplifier circuit is specified which has a switchable gain ratio. For this purpose, a parallel circuit comprising a first and a second current path () is provided between a radio-frequency signal input and output (), with the first current path () having a transistor which is connected in a common-base circuit for signal amplification, and the second current path () having a transistor which is connected in a common-emitter circuit () for signal amplification, and has input impedance matching (). Owing to the good noise characteristics and the good linearity characteristics, the described low-noise amplifier circuit is suitable for use in radio-frequency receivers in which adaptive pre-amplification is required even before a frequency converter, that is to say at the radio-frequency level, because the input signal has a wide dynamic range, such as that in the case of UMTS.