Gain control circuit, and a radio communication apparatus...

Details Gain control circuit, and a radio communication apparatus... Gain control circuit, and a radio communication apparatus...

2005-04-05

2005-04-05

Nguyen, Simon (Department: 2685)

Amplifiers

With semiconductor amplifying device

Including gain control means

C455S232100, C455S239100, C455S127200, C330S129000, C330S279000

Reexamination Certificate

active

06876257

ABSTRACT:
A gain control circuit comprises a variable gain circuit having a predetermined gain control range and a control voltage supply circuit for supplying an internal control voltage to the variable gain circuit as a gain control signal. In this gain control circuit, the control voltage supply circuit generates the internal control voltage in response to an external control voltage so as to compensate the linearity of the variable gain circuit to the extent of the external control voltage where the variable gain circuit loses linearity. This gain control circuit is applied to an AGC circuit of the transmitting stage in a CDMA-type mobile phone.

REFERENCES:
patent: 5146130 (1992-09-01), Kawakatsu
patent: 5606284 (1997-02-01), Tamesue et al.
patent: 5862460 (1999-01-01), Rich
patent: 5933771 (1999-08-01), Tiller et al.
patent: 6127890 (2000-10-01), Shimomura et al.
patent: 6215989 (2001-04-01), Otaka
patent: 6259682 (2001-07-01), Brown et al.
patent: 6553084 (2003-04-01), Maru

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