SAW DEVICE TYPE READER APPARTUS

摘要

PURPOSE: An SAW device type reader apparatus is provided to lead the sensor information and ID to the low power consumption. CONSTITUTION: The RF module(100) embodies as the TDS(time domain sampling) mode. The SAW sensor and radio frequency signal are and receive transmitted and the SAW sensor is recognized. The main module(200) processes the answer signal of the SAW sensor delivered from the RF module. The RF module comprises the transmission unit, receiver, I / Q demodulator, the A/D converter, the first pulse generator and the secondary pulse generating unit. The transmission unit(110) has the RF switch which is serially connected of 2. The receiver(120) has one RF switch in which inverter is connected. The signal answering is demodulated from I / Q demodulator(130) SAW sensor. The A/D converter(140) changes the analog value demodulated in I / Q demodulator into the digital value. The first pulse generator generates the synchronizing frequency for using in the transmission unit. The secondary pulse generating unit(160) generates the synchronizing frequency having the frequency of two times of the clock .