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Duong, Vinh-Hao,Hieu, Nguyen Xuan,Lee, Hyun-Sik,Lee, Jong-Wook Institute of Electrical and Electronics Engineers 2016 IEEE transactions on industrial electronics Vol. No.
<P>Herein, we present a fully integrated electronic product code (EPC) Gen-2 compatible battery-assisted passive (BAP) radio-frequency identification sensor tag integrated circuit (IC) with efficient power management. The key components of the tag IC include an adaptive radio-frequency (RF) energy harvester, a battery access controller (BAC), a storage capacitor charger, and a power-gated sensor block. External RF energy is efficiently harvested using dynamically controlled rectifying stages and a threshold-compensation technique. The BAC tightly controls the power path, cutting off leakage current from the battery. The power-gated sensor block supports multiplexed sensing operations in a power efficient manner. The sensor interface includes a chopper amplifier, a programmable gain amplifier, multiplexers, and an 8-bit ADC. For sensing data logging, custom designed nonvolatile memory is employed via one-time programmable memory. The digital control block is based on an EPCglobal Gen-2 standard that is modified to support the sensing operation. The tag chip was fabricated in a 1-poly 6-metal standard 0.18-mu m standard CMOS process. The tag IC consumes 1 mu A for leakage and active operation (0.1% duty), and the estimated lifespan of the BAP tag IC is about 0.2 year/mA.h.</P>
Development of a GPS/INS integrated navigation system for model aircraft
Bach-Phi Duong,Vinh-Hao Nguyen 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper addresses the development of an integrated navigation system based on MEMS inertial sensors and GPS for model aircraft. The objective of this paper is to propose a loosely coupled GPS/INS integration approach using Extended Kalman filter to estimate aircraft’s position, velocity, and attitude. Special attention is paid to the computational performance of the algorithm and the handling of GPS outages. The simulation results based on a typical high dynamic flight trajectory validate that the proposed filter is applicable to flight navigation.
A Fully Integrated EPC Gen-2 UHF-Band Passive Tag IC Using an Efficient Power Management Technique
Jong-Wook Lee,Ngoc Dang Phan,Duong Huynh-Thai Vo,Vinh-Hao Duong IEEE 2014 IEEE transactions on industrial electronics Vol.61 No.6
<P>We present a system-on-chip passive tag integrated circuit (IC) for secure near-field RF identification applications. The design of the RF transceiver and the digital control of the tag IC are based on the EPCglobal ultrahigh-frequency Gen-2 protocol. A new design technique for the power management of the tag IC is presented, which includes a low-voltage bandgap, a low-dropout regulator with a bias-boosted gain stage, and an adaptive dc limiter. With the proposed design technique, we achieve a high power conversion efficiency of 47% at a low input power of -12 dBm. To support data security, we use one-time programmable (OTP) memory for nonvolatile data storage. The 4-kb (256 × 16 b) OTP memory array is based on a two-transistor (2-T) gate-oxide antifuse that can be programmed with a voltage of less than 6 V. The tag chip was fabricated in a 1-poly 6-metal standard 0.13- μm CMOS process. The power consumption levels of the tag IC are 29.2 and 71.2 μW for the read and programming modes, respectively. The size of the tag chip is 1.1×1 mm<SUP>2</SUP>.</P>