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Multicarrier WCDMA Feasibility (Part 2)

Posted: 21 Aug 2007     Print Version  Bookmark and Share

Keywords:WCDMA  variable gain amplifier  spurious free dynamic range  3GPP 

This article is part of a series discussing the feasibility of implementing a multi-carrier transceiver for WCDMA or Wideband Code Division Multiple Access, a type of 3G cellular network, and discusses variable gain amplifier (VGA) implementation and spurious free dynamic range (SFDR).

There are two ways of implementing the VGA. It can be set to adjust signals either at the bottom end of the range or at the top end of the range. Each has advantages and disadvantages with a desirable goal being to implement the receiver without any gain control.

There are several guidelines in the 3GPP standard that provide SFDR requirements. These are primarily found in the single and two-tone blocking specifications. In this study, a narrow-band signal (CW) is allowed to intermodulate with either a WCDMA signal or a GMSK signal depending on the band of operation.

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