Title: Received signal strength indicator module and method of extending RF input power range
Application Number: 200610169302 Application Date: 2006.12.13
Publication Number: 1984422 Publication Date: 2007.06.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04Q7/34;H04B7/005
Applicant(s) Name: Luoda Science And Technology C. Address:
Inventor(s) Name: Chiu Tzu-huan;Lin Yi-jen;Liu Yu-hua
Attorney & Agent: luxiao zhang lixiao shu
Abstract:
    An extended range received signal strength indicator module includes input lines connected to a variable gain amplifier, which passes the amplified RF signal to a polyphase, which in turn passes the filtered signal to a series of RSSI stages. Each RSSI stage includes a log amplifier and outputs an amplified current to a current summer as well as to the next RSSI stage in the series. The current summer outputs the sum of the received currents to RSSI_OUT. An additional frequency filter and RSSI stage with inputs connected to the input lines before the variable gain amplifier that outputs the modified current to the current summer is also included. A control circuit switches the additional RSSI stage on or off as determined by a detection circuit that monitors the value of RSSI_OUT.
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