CPC H04B 1/1036 (2013.01) [H03F 3/245 (2013.01); H03H 7/0115 (2013.01); H04M 1/0202 (2013.01); H03F 2200/171 (2013.01); H04B 2001/1063 (2013.01); H04B 2001/1072 (2013.01)] | 20 Claims |
1. A radio frequency system with tunable notch filtering,
the radio frequency system comprising:
a power amplifier having an output;
a multi-throw switch;
a first tunable filter coupled between the output of the power amplifier and the multi-throw switch, the first tunable filter having at least a first tunable notch;
an antenna switch coupled to the multi-throw switch by way of one or more radio frequency signal paths; and
a second tunable filter coupled between the antenna switch and an antenna node, the second tunable filter having at least a second tunable notch, the second tunable notch being at a lower frequency than the first tunable notch, the second tunable filter being an L network that includes a parallel inductor-capacitor circuit and a shunt series inductor-capacitor circuit, and the parallel inductor-capacitor circuit arranged in series between the antenna switch and the antenna node.
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