Uigyu

Uigyu
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Home Yeungnam University Department of Electronic Engineering Ui-Gyu Choi
Yeungnam University · Department of Electronic Engineering
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
A wideband LC voltage-controlled oscillator (VCO) using a 3-bit switched-capacitor bank is proposed for improving the frequency bandwidth in K-band applications. The capacitor bank is composed of metal-oxide-metal (MOM) capacitors to obtain a high-quality factor of the LC tank. The size of the unit capacitor in the capacitor bank is optimized to ac...
An active isolator achieving both high isolation and low insertion loss at 2.45 GHz is proposed. The isolator is based on an asymmetric coupler and is designed to leverage the gain and reverse isolation of an amplifier and coupling coefficients between the input and output of the coupler. The insertion loss and isolation of the isolator are enhance...
A V-band CMOS frequency tripler with efficient input, output, and interstage matching networks is proposed to improve the output power and conversion efficiency. The interstage matching network, located between a tripler-core and a buffer amplifier, simultaneously performs the impedance matching of a desired third harmonic signal and the filtering...
A multi-level waveform generator with delay control is proposed for improving total-harmonic distortion of class D amplifiers. The voltage-mode class D amplifier is a circuit that amplifies the output voltage at the load to be twice almost the power supply voltage by using an input driving signal. The conventional 3-level class D amplifier generate...
An inverse class E frequency doubler is proposed to improve power conversion efficiency by using a transmission‐line‐based notch filter. The notch filter implemented using a transmission line is used at the output network in the doubler to suppress both fundamental and high‐order harmonic signals by a switching‐mode operation. A fourth harmonic sig...
A method of measuring the amplitude ratios and phase differences among the same RF output signals from multiple ports at the same frequency is proposed. A power combining module is used to couple multiple signals vectorially from the ports. In the proposed method, the amplitude ratios among RF signals from multiple ports are calculated by using the...
The class-E power amplifier module using an adaptive power combiner is proposed for 6.78-MHz wireless power transfer system for medium power transmission. Two class-E power amplifiers are designed to obtain more than 50-W output power at the load impedance which maximize the power-added efficiency of the amplifiers. The input impedances of the prop...
In this article, a highly efficient power module is presented with two class-E power amplifiers and an adaptive power combiner for transmitting output powers >100 W at 6.78 MHz in a wireless power transfer system. The losses caused by the combiners and interstage matching circuits or mismatching between the amplifier, and the combiners can signific...
CMOS based Transceiver Design Methodology
1) 15 dBm output power
2) 4 mm imaging resolution
3) 36 dB imaging SNR
Department of Electronic Engineering Gyeongsan-si, South Korea
Department of Electronic Engineering
Department of Electronic Engineering
Department of Electrical Engineering
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