Semiconductor integrated circuit device and wireless...

Details Semiconductor integrated circuit device and wireless... Semiconductor integrated circuit device and wireless...

2007-06-19

2007-06-19

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S254000

Reexamination Certificate

active

10422953

ABSTRACT:
As the gain control amplifiers for amplifying the reception signal, the step amplifiers are used. Two sets of these step amplifiers are provided and are then controlled to be used alternately. When switching of the gain occurs, after the gain is switched with the step amplifier not operated and offset is cancelled, the amplifier to which the reception signal is inputted is switched. Accordingly, the step amplifier can be used as the gain control amplifier for amplifying the reception signal to provide almost constant power consumption even when the gain is changed depending on the intensity of reception signal in the semiconductor integrated circuit device for communication to form a wireless communication system of dual-mode or more modes including the W-CDMA system. As a result, the operation life of battery, namely, the reception waiting period and communication period by single charging process can be expanded.

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patent: 9-64666 (1997-03-01), None

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