APPARATUS AND METHOD FOR DETECTING A SIGNAL OF A PASSIVE SENSOR USING A SURFACE ACOUSTIC WAVE

摘要

PURPOSE: An apparatus and a method for detecting a signal of a passive sensor using a surface acoustic wave are provided to detect a characteristic value of a response signal from a passive sensor by canceling a noise of a plurality of response signals through frequency analysis. CONSTITUTION: A phase synchronizing circuit(102) outputs a divided signal to synchronize an output time point of a query signal. A first oscillator(106) generates a first radio frequency for signal transmission. A signal controller(104) controls the first radio frequency to be outputted as the query signal having synchronized phase according to the divided signal. A second oscillator(116) generates a second radio frequency for signal reception. A synthesizing unit(118) synthesizes a response signal of a passive sensor of the query signal and the second radio frequency.