Time filter

Source Type

Daejeon, South Korea

Lee I.-Y.,Korea Advanced Institute of Science and Technology | Kim S.,Samsung | Lee S.-S.,Korea Advanced Institute of Science and Technology | Choi J.,Korea Advanced Institute of Science and Technology | And 2 more authors.
IEEE Transactions on Microwave Theory and Techniques | Year: 2015

This paper presents a robust spur reduction technique using a switched-capacitor feedback differential phase-locked loop (PLL) and a delay-locked-loop (DLL)-based spread-spectrum clock generation in a UHF-band RF identification transmitter (TX). The proposed differential PLL is characterized by adopting a switched-capacitor common-mode feedback and distributed varactor biasing scheme to the differential charge pump and voltage-controlled oscillator designs, respectively, which results in down to -94 dBc in reference spur rejection with all digital parts off. Additionally, by adopting an 8-bit DLL and Hershey-Kiss modulated profile together, the proposed spread-spectrum clock generator shows more than 20-dB electromagnetic-interference reduction while providing up-, down-, and center-spread modes. Implemented in a 0.18-μ m CMOS process, the proposed TX achieves < -80 -dBc spur suppression with 25-dBm transmit power at 920 MHz, which complies with the most stringent regulatory spectral mask without a surface acoustic wave filter. © 1963-2012 IEEE. Source

Yang H.,Gwangju Institute of Science and Technology | Kim J.,PHYCHIPS Inc. | Bien F.,Ulsan National Institute of Science and Technology | Lee A.J.,Gwangju Institute of Science and Technology
IEICE Electronics Express | Year: 2011

A fully integrated system-in-package (SiP) for UHF (860-960 MHz) RFID mobile reader is presented. The SiP is made up of an UHF transceiver, a power amplifier (PA), and two baluns. The UHF transceiver was designed in TSMC 0.18 μm Si CMOS and the PA was developed with InGaP/GaAs hetero-junction-bipolar transistor (HBT) technology. The transceiver IC is fully integrated for mobile UHF RFID applications and the PA has high efficiency and linearity with 24dBm output power for wireless RFID communications over a distance of 1m. The total size of the SiP module is 11mm ×11 mm. The measured data show a transmitter gain of 19.2 dB, total current of 253mA and adjacent channel power ratio (ACPR) of -41.8 dBc with the second harmonic performance of -57.6 dBc. Also, TX-RX leakage was reduced by careful power amplifier and board designs in small SIP module implementation. © IEICE 2011. Source

PHYCHIPS Inc. | Date: 2015-04-21

A vector modulator of a transceiver may be provided that includes: a variable resistor having one end to which an input signal is transmitted; a variable capacitor which is connected in parallel to the variable resistor and has one end to which the input signal is transmitted; and a summing circuit which sums a signal of the other end of the variable resistor and a signal of the other of the variable capacitor.

PHYCHIPS Inc. | Date: 2013-06-17

Radio-frequency identification (RFID) readers.

PHYCHIPS Inc. | Date: 2013-07-30

Semi-conductors; semi-conductor wafers; electronic integrated circuits; electronic circuit boards; integrated circuit modules; radio frequency identification (RFID) chips; radio frequency identification (RFID) reader/writer modules; radio frequency identification (RFID) antennas.

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