http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Analysis and Optimization for High-Performance CMOS QVCO with Current-Reuse and Back-Gate Coupling
Changwoo Lim,Tae-Yeoul Yun 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
A quadrature voltage-controlled oscillator (QVCO) is presented with low phase noise, low power consumption, and a wide tuning range based on analysis and optimization. The proposed QVCO uses the current-reuse and back-gate coupling techniques to obtain low power and low phase noise. A phase noise analysis for the back-gate coupled QVCO is presented and compared with that of the parallel coupled QVCO. The phase noise is optimized by varying the bias current, and the phase noise figure-of-merit. The measured results show a phase noise of -119.32 dBc/Hz at an offset frequency of 1 MHz, a tuning range from 4.5 to 5.68 GHz, and an FOMT of -195.92 dBc/Hz while the proposed QVCO consumes 2.41 mW. It is implemented using a 0.18-μm RF CMOS process.
Seon, Ji-Yun,Yoon, Young Joon,Choi, Jaekyoung,Kim, Hyo Tae,Kim, Chang-Yeoul,Kim, Jong-Hee,Baik, Hong Koo American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>A dielectophoretic (DEP) device fabricated by a conventional low temperature co-fired ceramic (LTCC) process, for manipulating micro and nanostructure materials, such as spherical polystyrene microspheres, titanium dioxide (TiO2) nanotubes, and silver (Ag) nanowires, is described. To generate a non-uniform electric field, a castellated electrode configuration was applied to the LTCC-based DEP device using a screen printing method. The actual motions of the micro and nanostructure materials under both a positive and a negative DEP force were observed in detail and the findings compared with numerical simulation data for the electric field distribution. The performance of the LTCC-based DEP device for separating and trapping was evaluated and potential applications are discussed.</P>
An Ultra Wideband Low Noise Amplifier in 0.18μm RF CMOS Technology
Ji-Hak Jung,Tae-Yeoul Yun,Jae-Hoon Choi 한국전자파학회JEES 2005 Journal of Electromagnetic Engineering and Science Vol.5 No.3
This paper presents a broadband two-stage low noise amplifier(LNA) operating from 3 to 10 GHz, designed with 0.18 μm RF CMOS technology. The cascode feedback topology and broadband matching technique are used to achieve broadband performance and input/output matching characteristics. The proposed UWB LNA results in the low noise figure(NF) of 3.4 dB, input/output return loss(S₁₁/S₂₂) of lower than ―10 dB, and power gain of 14.5 dB with gain flatness of ±1 dB within the required bandwidth. The input-referred third-order intercept point(IIP₃) and the input-referred 1-dB compression point(P_(1dB)) are ―7 dBm and ―17 dBm, respectively.
Compact Wideband Open-End Slot Antenna With Inherent Matching
Zhe-Jun Jin,Tae-Yeoul Yun IEEE 2014 IEEE antennas and wireless propagation letters Vol.13 No.-
<P>A compact wideband open-end slot antenna is proposed for DCS, PCS, UMTS, WLAN, and WiMAX band applications. The antenna is composed of an open-ended slot and a central line within the slot. The open-end slot decreases the antenna size in half, compared to a conventional slot-ring antenna. Furthermore, the narrowed slot and central line miniaturize the antenna and obtain wideband performance using the inherent impedance-matching network of the central line. The proposed antenna obtained an omnidirectional radiation pattern with an antenna gain of larger than 1 dBi and an antenna efficiency of greater than 50% over 1710-3660 MHz.</P>