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Accoustic resonator having integrated lateral feature and temperature compensation feature

  • US 9,444,426 B2
  • Filed: 02/14/2013
  • Issued: 09/13/2016
  • Est. Priority Date: 10/25/2012
  • Status: Active Grant
First Claim
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1. A bulk acoustic wave (BAW) resonator device, comprising:

  • a lower electrode disposed over a substrate over one of a cavity and an acoustic mirror;

    a piezoelectric layer on the lower electrode; and

    an upper electrode disposed over the piezoelectric layer, at least one of the lower electrode and the upper electrode being a hybrid electrode comprising a temperature compensating layer having a positive temperature coefficient for offsetting at least a portion of a negative temperature coefficient of the piezoelectric layer, and an integrated frame configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the hybrid electrode comprises an outside electrode layer, an inside electrode layer and an interposer layer, the temperature compensating layer being formed between the inside electrode layer and the interposer layer and the interposer layer being formed between the temperature compensating layer and the piezoelectric layer.

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