Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-03-21
2006-03-21
Nguyen, Simon (Department: 2685)
Amplifiers
With semiconductor amplifying device
Including gain control means
C455S127200, C455S232100, C455S239100, C330S254000, C330S279000
Reexamination Certificate
active
07015758
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.
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Morohashi Hideo
Tanabe Shinichi
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