Integrated coupled resonator filtering

An integrated circuit coupled resonator filter comprising:

• a first parallel resonator including a first capacitance connected in parallel with a first inductance;
• a second parallel resonator including a second capacitance connected in parallel with a second inductance;
• and
• a third parallel resonator including a third capacitance connected in parallel with a third inductance wherein the first parallel resonator, the second parallel resonator and the third parallel resonator are implemented in an integrated circuit;
• wherein magnetic coupling between the first inductance and the second inductance magnetically couples the first parallel resonator and the second parallel resonator in accordance with a first coupling factor;
• wherein magnetic coupling between the second inductance and the third inductance magnetically couples the second parallel resonator and the third parallel resonator in accordance with a second coupling factor;
• wherein magnetic coupling between the first inductance and the third inductance magnetically couples the first parallel resonator and the third parallel resonator in accordance with a third coupling factor and feeds a first signal to an output of the coupled resonator filter;
• wherein a frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions causing signal cancellation to occur between the first signal and a second signal fed to the output via the second inductance.