Radio frequency front end with tunable filters

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 including a first inductor, a second inductor mutually coupled to the first inductor, and a tunable capacitance circuit coupled to the first inductor.

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, the first tunable filter including a first inductor, a second inductor mutually coupled to the first inductor, and a tunable capacitance circuit coupled to the first inductor;
• 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.

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;
• a tunable shunt capacitance circuit coupled to a node between the first tunable filter and the multi-throw switch, the tunable shunt capacitance circuit being configured to tune a load line;
• 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.