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US 12,658,889 B2Granted
Acoustic tuning network in an acoustic filter circuit
AssigneeQorvo US, Inc.
InventorNadim Khlat
Life of this patent
Estimating the term…
Abstract
An acoustic tuning network is provided. In embodiments disclosed herein, the acoustic tuning network can be coupled in parallel to an acoustic resonator and tuned to either cancel an input current or an output current of the acoustic resonator. As such, it is possible to provide multiple acoustic tuning networks in an acoustic filter circuit having multiple acoustic resonators to enable a variety of application scenarios.
Claims20
An acoustic tuning network comprising:
- a ferroelectric acoustic circuit comprising:
- an inductor circuit coupled between a signal input and a signal output of an acoustic resonator;
- and
- an impedance tuning circuit coupled perpendicular to the inductor circuit and configured to present a shunt impedance to the inductor circuit;
- and
- a control circuit configured to control the impedance tuning circuit to adapt the shunt impedance to thereby cause the ferroelectric acoustic circuit to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the acoustic resonator;
- and
- selectively cancel one of an output current at the signal output and an input current at the signal input to thereby make an input impedance seen at the signal input independent from a load impedance seen at the signal output.
6 more elements
An acoustic filter circuit comprising:
- a plurality of acoustic branches each comprising a respective output acoustic resonator coupled between a respective signal input and a respective signal output;
- a plurality of ferroelectric acoustic circuits each comprising:
- an inductor circuit coupled in parallel to the respective output acoustic resonator between the respective signal input and the respective signal output in a respective one of the plurality of acoustic branches;
- and
- an impedance tuning circuit coupled perpendicular to the inductor circuit and configured to present a shunt impedance to the inductor circuit;
- and
- a control circuit configured to control the impedance tuning circuit in each of the plurality of ferroelectric acoustic circuits to adapt the shunt impedance to thereby cause each of the plurality of ferroelectric acoustic circuits to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the respective one of the plurality of acoustic resonators;
- and
- selectively cancel one of a respective output current at the respective signal output and a respective input current at the respective signal input to thereby make a respective input impedance seen at the signal input independent from a respective load impedance seen at the signal output.
7 more elements
A wireless device comprising an acoustic tuning network, comprising:
- a ferroelectric acoustic circuit comprising:
- an inductor circuit coupled between a signal input and a signal output of an acoustic resonator;
- and
- an impedance tuning circuit coupled perpendicular to the inductor circuit and configured to present a shunt impedance to the inductor circuit;
- and
- a control circuit configured to control the impedance tuning circuit to adapt the shunt impedance to thereby cause the ferroelectric acoustic circuit to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the acoustic resonator;
- and
- selectively cancel one of an output current at the signal output and an input current at the signal input to thereby make an input impedance seen at the signal input independent from a load impedance seen at the signal output.
6 more elements
A wireless device comprising an acoustic filter circuit, comprising:
- a plurality of acoustic branches each comprising a respective output acoustic resonator coupled between a respective signal input and a respective signal output;
- a plurality of ferroelectric acoustic circuits each comprising:
- an inductor circuit coupled in parallel to the respective output acoustic resonator between the respective signal input and the respective signal output in a respective one of the plurality of acoustic branches;
- and
- an impedance tuning circuit coupled perpendicular to the inductor circuit and configured to present a shunt impedance to the inductor circuit;
- and
- a control circuit configured to control the impedance tuning circuit in each of the plurality of ferroelectric acoustic circuits to adapt the shunt impedance to thereby cause each of the plurality of ferroelectric acoustic circuits to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the respective one of the plurality of acoustic resonators;
- and
- selectively cancel one of a respective output current at the respective signal output and a respective input current at the respective signal input to thereby make a respective input impedance seen at the signal input independent from a respective load impedance seen at the signal output.
7 more elements
A method for operating an acoustic tuning network comprising:
- coupling an inductor circuit in a ferroelectric acoustic circuit between a signal input and a signal output of an acoustic resonator;
- coupling an impedance tuning circuit perpendicular to the inductor circuit to present a shunt impedance to the inductor circuit;
- controlling the impedance tuning circuit to adapt the shunt impedance to thereby cause the ferroelectric acoustic circuit to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the acoustic resonator;
- and
- selectively cancel one of an output current at the signal output and an input current at the signal input to thereby make an input impedance seen at the signal input independent from a load impedance seen at the signal output.
3 more elements
A method for operating an acoustic filter circuit comprising:
- providing a plurality of acoustic branches to each include a respective output acoustic resonator coupled between a respective signal input and a respective signal output;
- coupling an inductor circuit in each of a plurality of ferroelectric acoustic circuits in parallel to the respective output acoustic resonator between the respective signal input and the respective signal output in a respective one of the plurality of acoustic branches;
- coupling an impedance tuning circuit perpendicular to the inductor circuit to present a shunt impedance to the inductor circuit;
- and
- controlling the impedance tuning circuit in each of the plurality of ferroelectric acoustic circuits to adapt the shunt impedance to thereby cause each of the plurality of ferroelectric acoustic circuits to:
- present a negative capacitance between the signal input and the signal output to cancel an electrical capacitance associated with the respective one of the plurality of acoustic resonators;
- and
- selectively cancel one of a respective output current at the respective signal output and a respective input current at the respective signal input to thereby make a respective input impedance seen at the signal input independent from a respective load impedance seen at the signal output.
5 more elements
Dependencies are inferred from the claim text.