BAW/SAW-assisted LC filters and multiplexers
摘要:
Embodiments of radio frequency (RF) filtering circuitry are disclosed. In one embodiment, the RF filtering circuitry includes a common port, a second port, a third port, a first RF filter path, and a second RF filter path. The first RF filter path is connected between the common port and the second port and comprises a first pair of resonators and a first acoustic wave resonator. One of the first pair of resonators also includes a second acoustic wave resonator. The second RF filter path is connected between the common port and the third port. The second RF filter path includes a second pair of resonators. The first and second acoustic wave resonators of the first RF filter path increase roll-off greatly with respect to just an LC filter, and thereby allow for an increase out-of-band rejection at high frequency ranges.
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