Jong-Eun Jang

A 900-MHz Direct-Conversion Transceiver for Mobile RFID Systems

A fully integrated 900-MHz direct-conversion transceiver for mobile RFID system is presented. The transceiver consists of a low noise amplifier, a down-conversion mixer, a band pass filter, and programmable gain amplifier (PGA) for RX path; and a power amplifier, an up-conversion mixer, a low-pass filter, and a PGA for TX path. In addition, the fractional N PLL is integrated to cover different frequency standards for different nations. The transceiver meets the dense reader environment specifications.

Direct-conversion RF transceiver and modem IC for UHF RFID reader system

In this paper, a UHF RFID reader system with a direct-conversion RF transceiver and modem IC for EPC global RFID dense-reader standard is presented.

A Low Power and High Linearity Up Down Converter for Wireless Repeater

Abstract – We have designed and fabricated a low power and high linearity up down convertor for wireless repeaters using 0.35 ㎛ SiGe Bipolar CMOS technology. Repeater is composed of a wideband up/down converting mixer, programmable gain amplifiers (PGA), input buffer, LO buffer, filter driver amplifier and integer-N phase locked loop (PLL). As of the measurement results, OIP3 of the down conversion mixer and up conversion mixer are 32 dBm and 17.8 dBm, respectively. The total dynamic gain range is 31 dB with 1 dB gain step resolution. The adjacent channel leakage ratio (ACLR) is 59.9 dBc. The total power consumption is 240 mA at 3.3 VKey Words : Repeater, PLL, High linearity, ACLR†Corresponding Author : School of Electrical and Electronics Engineering, Chung-Ang University, Korea.E-mail: ychoi@cau.ac.kr* School of Electrical and Electronics Engineering, Chung-AngUniversity, Korea.** EPIC Solution Co., LTd., Korea. Received : December 09, 2014; Accepted : February 26, 2015

A Design of High Efficiency Microwave Wireless Power Acceptor IC

Wireless power transmission technology has been studied variety. Recently, wireless power transmission technology used by resonance and magnetic induction field is applied to various fields. However, magnetic resonance and inductive coupling are have drawbacks - power transmission distance is short. Microwave transmission and accept techniques have been developed to overcome short distance. However, improvement in efficiency is required. This paper, propose a high-efficiency microwave energy acceptor IC(EAIC). Suggested EAIC is consists of RF-DC converter and DC-DC converter. Wide Input power range is -15 dBm ~ 20 dBm. And output voltage is boosted up to 5.5 V by voltage boost-up circuit. EAIC can keep the output voltage constant. Available efficiency of RF-DC converter is 95.5 % at 4 dBm input. And DC-DC efficiency is 94.79 % at 1.1 mA load current. Fully EAIC efficiency is 90.5 %.