Qorvo Us, Inc.

Mudar AlJoumayly

Yazid Yusuf

Alfred Gimenez

Gernot G Fattinger

Jean Briot

Vincenzo DiTommaso

Peter Richard Molnar

Acoustic resonators, such as bulk acoustic wave (BAW) resonators, are disclosed that include mode suppression structures. Acoustic resonators, including stacked crystal filters (SCFs), are disclosed that include spurious mode suppression by modifying a piezoelectric coupling profile within one or more layers of an SCF. Mode suppression configurations may include structures with one or more inverted polarity piezoelectric layers, one or more non-piezoelectric layers, one or more thicker electrodes of the SCF, and combinations thereof. Symmetric input and output electrical response for SCFs with mode suppression configurations may be exhibited by including piezoelectric materials with different electromechanical coupling values and/or by dividing stress profiles differently by configuring different thicknesses for input and output sides of SCFs.

Mode suppression in acoustic resonators

Acoustic resonators, such as bulk acoustic wave (BAW) resonators, are disclosed that include phase shift structures. Acoustic resonators, including stacked crystal filters (SCFs) and coupled resonator filters (CRFs), may include inverted piezoelectric layers that are configured to provide built-in phase shift capabilities. Circuit topologies that include such SCFs may be provided with simplified structures and reduced loss. Circuit topologies with such CRFs may be provided with more symmetrical electrical connections and improved phase balance over operating frequencies. SCFs with phase shift structures may additionally include spurious mode suppression by modifying piezoelectric coupling profiles within one or more layers. Mode suppression configurations may include structures with one or more inverted polarity piezoelectric layers, one or more non-piezoelectric layers, one or more thicker electrodes of the SCF, and combinations thereof.

Phase shift structures for acoustic resonators

A radio frequency (RF) circuit is provided. The RF circuit may include a variety of RF filters organized into a number of filter banks and configured to support carrier aggregation (CA) in a variety of band combinations. In examples discussed herein, the RF circuit is configured to utilize separate receive and transmit filters for filtering an RF receive signal and an RF transmit signal in a time-division duplex (TDD) band, respectively. By employing separate receive and transmit filters for the TDD band, as opposed to using an integrated receive-transmit filter, it may be possible to implement the receive and transmit filters in the RF circuit with improved impedance matching, interference rejection, and insertion loss without increasing a footprint of the RF circuit.

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Casselberry, FL, United States of America

Mudar AlJoumayly