Apparatuses and methods for tuning center frequencies
First Claim
1. A method for tuning an acoustic wave resonator that includes a plurality of radio-frequency (rf) transducer electrodes, comprising:
- in a feedback loop, receiving a feedback signal from one or more of the rf transducer electrodes;
phase shifting the received feedback signal to provide a phase shifted feedback signal having a phase shift;
amplifying the phase-shifted feedback signal to provide a tuning signal; and
returning the tuning signal to one or more of the rf transducer electrodes;
wherein;
the method further comprises applying a control signal to a variable gain amplifier for actively tuning the acoustic wave resonator;
the amplification of the phase-shifted feedback signal is performed, at least in part, in the variable gain amplifier in response to the control signal;
the tuning signal is returned to the one or more said rf transducer electrodes with the said phase shift;
the plurality of rf transducer elements comprises a feedback group, a tuning group, an input group, and an output group, each said group consisting of one or more rf transducer electrodes unshared with any other said group;
the feedback signal is received in the feedback loop from the feedback group;
the tuning signal is returned to the tuning group;
the method further comprises applying an input signal to an input port connected to the input group; and
the method further comprises obtaining an output signal from an output port connected to the output group.
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Abstract
Apparatuses and methods for tuning center frequencies are described herein. Examples of tuning described herein including tuning using feedback from the resonator. Variable gain feedback for tuning of acoustic wave resonators is provided in some examples. An example apparatus may include a resonator and a feedback loop. The resonator may be configured to receive a tuning signal and to provide a feedback signal. The feedback signal may be based on the tuning signal. The feedback loop may be configured to receive the feedback signal from the resonator. The feedback loop further may be configured to provide the tuning signal to actively tune a center frequency of the resonator. The tuning signal may be based on the feedback signal.
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Citations
13 Claims
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1. A method for tuning an acoustic wave resonator that includes a plurality of radio-frequency (rf) transducer electrodes, comprising:
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in a feedback loop, receiving a feedback signal from one or more of the rf transducer electrodes; phase shifting the received feedback signal to provide a phase shifted feedback signal having a phase shift; amplifying the phase-shifted feedback signal to provide a tuning signal; and returning the tuning signal to one or more of the rf transducer electrodes;
wherein;the method further comprises applying a control signal to a variable gain amplifier for actively tuning the acoustic wave resonator; the amplification of the phase-shifted feedback signal is performed, at least in part, in the variable gain amplifier in response to the control signal; the tuning signal is returned to the one or more said rf transducer electrodes with the said phase shift; the plurality of rf transducer elements comprises a feedback group, a tuning group, an input group, and an output group, each said group consisting of one or more rf transducer electrodes unshared with any other said group; the feedback signal is received in the feedback loop from the feedback group; the tuning signal is returned to the tuning group; the method further comprises applying an input signal to an input port connected to the input group; and the method further comprises obtaining an output signal from an output port connected to the output group. - View Dependent Claims (2, 3, 4)
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5. An apparatus having a resonant frequency that is tunable in response to a control signal, comprising:
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an acoustic wave resonator that includes a plurality of radio-frequency (rf) transducer electrodes; and a feedback loop configured to receive a feedback signal from one or more of the rf transducer electrodes, process the received feedback signal so as to create a tuning signal, and return the tuning signal to one or more of the rf transducer electrodes;
wherein;the feedback loop comprises an element for imparting a phase shift to the feedback signal so as to provide a phase-shifted feedback signal; the feedback loop further comprises a variable gain amplifier configured to amplify the phase-shifted feedback signal according to a gain controlled by the control signal, thereby to actively tune the resonant frequency; the tuning signal is returned to the one or more said rf transducer electrodes with the said phase shift imparted by the phase-shifting element; the plurality of rf transducer elements comprises an input group, an output group, a feedback group, and a tuning group, each said group consisting of one or more rf transducer electrodes unshared with any other said group; a signal input port is connected to the input group; a signal output port is connected to the output group; the feedback loop receives the feedback signal from the feedback group; and the tuning signal is returned to the tuning group. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An apparatus having a resonant frequency that is tunable in response to a control signal, comprising:
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an acoustic wave resonator that includes a plurality of radio-frequency (rf) transducer electrodes; and a feedback loop configured to receive a feedback signal from one or more of the rf transducer electrodes, process the received feedback signal so as to create a tuning signal, and return the tuning signal to one or more of the rf transducer electrodes;
wherein;the feedback loop comprises an element for imparting a phase shift to the feedback signal so as to provide a phase-shifted feedback signal; the feedback loop further comprises a variable gain amplifier configured to amplify the phase-shifted feedback signal according to a gain controlled by the control signal, thereby to actively tune the resonant frequency; the tuning signal is returned to the one or more said rf transducer electrodes with the said phase shift imparted by the phase-shifting element; the plurality of rf transducer elements comprises an output group, an internal feedback group, an external feedback group, and a tuning group, each said group consisting of one or more rf transducer electrodes unshared with any other said group; the output group is connected to an input of a transimpedance amplifier; an output of the transimpedance amplifier is connected to an output port; the output of the transimpedance amplifier is connected to the internal feedback group; the feedback loop receives the feedback signal from the external feedback group; and the tuning signal is returned to the tuning group. - View Dependent Claims (13)
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Specification