Patent ID: 9270281
Filing Date: 2016-02-23
CPC Classification: H03H,H03J,H03L

Claim Text:
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.