Q5500 is a new variable gain integrated circuit chip with wide dynamic range produced by QUALCOMM. It can be used in various systems such as dual-mode CDMA/FDM, TDMA/FDM, analog and digital cordless telephone circuits. This paper introduces the characteristics and functions of Q5500 and its application in the analog front end of the third generation mobile communication system, and gives the actual application circuit of Q5500.
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