Title: Circuit and method for filtering a radio frequency signal
Application Number: 200610121451 Application Date: 2006.08.22
Publication Number: 1921305 Publication Date: 2007.02.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03H11/04;H04B1/40
Applicant(s) Name: Infineon Technologies AG Address:
Inventor(s) Name: Hjelm Mikael
Attorney & Agent: liu gong zhang zhicheng
Abstract:
    A circuit (1) for filtering a radio frequency signal at a given frequency comprises an input terminal (3), a filter device (5), and an active AC shunt circuit (7) having first (7a) and second (7b) input terminals and an output terminal (7c), where the first input terminal (7a) of the active AC shunt circuit (7) is connected to the input terminal (3). The filter device (5) is connected between the input terminal (3) and the second input terminal (7b) of the active AC shunt circuit (7), and is provided for attenuating the radio frequency signal at the given frequency to the second input terminal (7b) of the active AC shunt circuit (7). The active AC shunt circuit (7) is provided for shunting a signal at a frequency other than the given frequency as contained in the radio frequency signal to ground (G), and for outputting the radio frequency signal as filtered at its output terminal (7c).
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