Title: High frenquency signal receiver and semiconductor integrated circuit
Application Number: 200410092642 Application Date: 2004.11.15
Publication Number: 1617456 Publication Date: 2005.05.18
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04B1/10;H04B1/16
Applicant(s) Name: Risa Tech Co., Ltd. Address:
Inventor(s) Name: Yamamoto Akio;igarashi Yutaka;ikuta Ko
Attorney & Agent: hu jianxin
Abstract:
    A high frequency signal receiver comprising a variable gain amplifier, a first filter for restricting a bandwidth of an analog baseband signal, an AD converter connected to the first filter, a second filter for restricting the bandwidth of an output of the AD converter, an interference wave detection circuit for detecting the level of an interference wave in the received signal, and a controller for controlling the first filter to have a wide bandwidth when the level of the interference wave is lower than a threshold level, and switching the first filter to have a narrow bandwidth while changing the characteristics of the second filter so as to compensate deterioration of the pass-band of the first filter when the level of the interference wave is equal to or greater than the threshold level.
Time: 9
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