Patent ID: 6570462
Filing Date: 2003-05-27
Classification: H03H

Abstract:
A method for adaptive tuning in a wireless communication device, the method comprising the steps of:determining magnitude and phase differences between impedance of a matching circuit and an impedance to be matched; and adjusting the impedance of the matching circuit to compensate the differences; wherein the determining step comprises the steps of: providing a first interdigital transducer (IDT) track comprising a first input IDT configured to produce a surface acoustic wave (SAW) output when excited by an electrical input signal, a first output IDT configured to produce an electrical output signal when excited by a SAW input, and a first terminated IDT positioned adjacent to the first input IDT and the first output IDT and configured to produce a SAW output when excited by an electrical input signal and an electrical output signal when excited by a SAW input; providing a first termination circuit connected to the first terminated IDT and causing the first terminated IDT to reflect a SAW toward the first output IDT responsive to a SAW produced by the first input IDT; applying an electrical input signal to the first input IDT to produce a first SAW; and receiving a first electrical output signal produced by the first output IDT in response to a first reflected SAW produced by the first terminated IDT responsive to the first SAW.