The Veriner-Based TDC and its Application to Distance Measurement in the Indoor RFID System

• Main Authors: Yu-jou Wen, 温鈺柔
• Other Authors: Chia-yu Yao
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/94278736613695444082

碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === A time-to-digital converter (TDC) plays an important role in time interval measurement. Among various TDC structures, the vernier-based TDC is promising because it can possess highly accurate time resolution. However, the oscillators used in the conventional vernier-based TDC require complicated calibration procedure. This makes the TDC difficult in use. In this thesis, we purpose a new soft-injection-locked ring oscillator as the clock source for the vernier-based TDC. The proposed oscillator can oscillate immediately and accurately right after the trigger signal arrives. The proposed TDC will be applied in an RFID indoor localization system to measure the time of arrival in the future. The TDC structure that we proposed was verified by TSMC 0.18 μm CMOS process. Experimental results show that the equivalent resolution is less than ±1 LSB.