Coupled resonator filter tuning circuit
AssigneeQorvo US, Inc.
InventorNadim Khlat
Life of this patent
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Abstract
A coupled resonator filter (CRF) tuning circuit is provided. Herein, a CRF structure includes a ferroelectric input resonator, a ferroelectric output resonator, and a ferroelectric tuning resonator coupled to the ferroelectric input resonator and the ferroelectric output resonator via a coupling layer. In embodiments disclosed herein, a tuning controller is configured to cause the coupling layer to be polarized relative to the ferroelectric input resonator or the ferroelectric output resonator. As a result, it is possible to adapt the sustainable filter bandwidth of the CRF structure based on various radio frequency (RF) filtering requirements.
Claims20
A coupled resonator filter (CRF) tuning circuit comprising:
- a CRF structure comprising:
- a ferroelectric input resonator and a ferroelectric output resonator coupled by a piezoelectric layer;
- and
- a ferroelectric tuning resonator coupled to the ferroelectric input resonator and the ferroelectric output resonator via a coupling layer;
- and
- a tuning controller configured to cause the coupling layer to be polarized relative to one of the ferroelectric input resonator and the ferroelectric output resonator to thereby modify a filter bandwidth of the CRF structure.
A wireless device comprising a coupled resonator filter (CRF) tuning circuit, comprising:
- a CRF structure comprising:
- a ferroelectric input resonator and a ferroelectric output resonator coupled by a piezoelectric layer;
- and
- a ferroelectric tuning resonator coupled to the ferroelectric input resonator and the ferroelectric output resonator via a coupling layer;
- and
- a tuning controller configured to cause the coupling layer to be polarized relative to one of the ferroelectric input resonator and the ferroelectric output resonator to thereby modify a filter bandwidth of the CRF structure.
A method for tuning a coupled resonator filter (CRF) structure comprising:
- coupling a ferroelectric input resonator and a ferroelectric output resonator by a piezoelectric layer in the CRF structure;
- coupling a ferroelectric tuning resonator to the ferroelectric input resonator and the ferroelectric output resonator via a coupling layer;
- and
- polarizing the coupling layer relative to one of the ferroelectric input resonator and the ferroelectric output resonator to thereby modify a filter bandwidth of the CRF structure.
Dependencies are inferred from the claim text.