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:
Nov. 02, 2004
Filed:
Sep. 19, 2001
Daniel Eric Losser, Grayslake, IL (US);
Arul Balasubramaniyan, Round Lake, IL (US);
Dan Nobbe, Crystal Lake, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
The present invention describes a voltage controlled attenuator (VCA) to control an output power level of a radio frequency (RF) signal and to direct the RF signal to an appropriate path for a multi-mode and multi-band radiotelephone without using an external switch and without using multiple common VCAs. The present invention comprises a single differential amplifier and a plurality of steering blocks with each of steering blocks having a path dedicated to a specific RF band and a specific RF mode, having a pair of steering lines to control the RF signal level by having a differential voltage applied, and being capable of being disabled by having its steering lines grounded.