Mobile communication terminal apparatus, a variable gain...

Details Mobile communication terminal apparatus, a variable gain... Mobile communication terminal apparatus, a variable gain...

2004-11-29

2008-12-23

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S234100, C455S239100, C455S136000, C455S138000, C455S245100, C375S345000, C330S254000, C330S279000

Reexamination Certificate

active

07469134

ABSTRACT:
In order to avoid disappearance of output symbols in accompaniment with DC voltage fluctuations occurring at the timing of switching gain in receiving systems for mobile telephones or the like compatible with W-CDMA systems, the present invention provides a variable gain amplifier circuit, a gain control circuit and a mobile communication terminal apparatus, in which a PGA section is comprised of PGAs having different amplification widths continuously arranged in plural stages as in, two coarse adjustment PGAs, a fine adjustment PGA and a coarse adjustment PGA from the input side to the output side; and a gain control circuit has a memory storing a history of gain control with regard to the PGA section and a logic circuit individually controlling gain of each PGA.

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