Youngoo Yang
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View article: Analysis of Grain Growth Behavior of Intermetallic Compounds on Plated Pure Sn for Micropump Solder Caps
Analysis of Grain Growth Behavior of Intermetallic Compounds on Plated Pure Sn for Micropump Solder Caps Open
We evaluated for the morphology and growth behavior of IMC grain according to number of reflows of solder cap pure Sn microbumps. In the structure of Ni barrier/Cu layer between Cu pillar and pure Sn, solder cap pure Sn on the top layer wa…
View article: Positive school climate boosts children’s reading achievement, mental health and cortical thinning
Positive school climate boosts children’s reading achievement, mental health and cortical thinning Open
Growing evidence underscores school climate as an important protective factor for children's academic achievement and mental health. However, whether and how school climate impacts child development from behavioral to brain has remained la…
View article: 8-W 2-Stage GaN Doherty Power Amplifier Module on 7 × 7 QFN for the 5G N78 Band
8-W 2-Stage GaN Doherty Power Amplifier Module on 7 × 7 QFN for the 5G N78 Band Open
This paper presents a 2-stage GaN Doherty power amplifier module (DPAM) on a compact 7×7 quad flat no-lead (QFN) package, designed for the needs of 5G massive MIMO base transceiver systems. The interstage and input matching networks employ…
View article: Highly Linear 2.6 GHz Band InGaP/GaAs HBT Power Amplifier IC Using a Dynamic Predistorter
Highly Linear 2.6 GHz Band InGaP/GaAs HBT Power Amplifier IC Using a Dynamic Predistorter Open
This paper presents a highly linear two-stage InGaP/GaAs power amplifier integrated circuit (PAIC) using a dynamic predistorter for 5G small-cell applications. The proposed predistorter, based on a diode-connected transistor, utilizes a su…
View article: Design of a High-Gain Multi-Input LNA with 16.4 Degree Phase Shift Within the 32 dB Gain Range
Design of a High-Gain Multi-Input LNA with 16.4 Degree Phase Shift Within the 32 dB Gain Range Open
This paper presents a high-gain multi-input low-noise amplifier (LNA) design aimed at achieving stable phase and minimal noise within a flexible gain range for modern wireless communication systems. The proposed LNA, designed using a CASCO…
View article: A Design of High-Efficiency RF/Solar/ Triboelectric/Electromagnetic Energy Harvesting System
A Design of High-Efficiency RF/Solar/ Triboelectric/Electromagnetic Energy Harvesting System Open
This paper presents a comprehensive exploration of a Hybrid Energy Harvesting System designed to harvest energy from diverse sources, including 2.4 GHz and 5.8 GHz RF energy, electromagnetic (EM) energy, solar energy, and triboelectric ene…
View article: 100-nW Wake Up Receiver With -42.3 dBm Sensitivity for Real-Time Location Systems
100-nW Wake Up Receiver With -42.3 dBm Sensitivity for Real-Time Location Systems Open
This paper presents a Wake-up Receiver (WuR) with Ultra-Low Power (ULP) consumption for a Real-Time Location System (RTLS). A novel method for its always-on mode is proposed that operates without using any active amplifiers that results in…
View article: 23.5–27.5 GHz Band Doherty Power Amplifier Integrated Circuit Using 28 nm Bulk CMOS Process Based on Dynamic Power Dividing Network
23.5–27.5 GHz Band Doherty Power Amplifier Integrated Circuit Using 28 nm Bulk CMOS Process Based on Dynamic Power Dividing Network Open
This paper presents a Doherty power amplifier (DPA) integrated circuit (IC) designed to have enhanced gain, efficiency, and AM-AM characteristics through a dynamic power dividing technique, which can control the power dividing ratio accord…
View article: Bandwidth Extension of the Doherty Power Amplifier Using the Impedance Distribution and Control Circuit for the Post-Matching Network
Bandwidth Extension of the Doherty Power Amplifier Using the Impedance Distribution and Control Circuit for the Post-Matching Network Open
Owing to the high impedance transformation ratio, the Doherty power amplifier (DPA) with a large output power back-off generally has bandwidth limitations. This study proposes an asymmetric DPA with an impedance distribution and control ci…
View article: Design of Series-Fed Circularly Polarized Beam-Tilted Antenna for Microwave Power Transmission in UAV Application
Design of Series-Fed Circularly Polarized Beam-Tilted Antenna for Microwave Power Transmission in UAV Application Open
In response to the increasing deployment of unmanned aerial vehicles (UAVs) across various sectors, the demand for efficient microwave power transmission (MPT) systems for UAVs has become paramount. This study introduces series-fed circula…
View article: LTCC Differential-Fed Broadband High-Gain and Narrow-Beam Planar Aperture Antenna for AiP Millimeter-Wave-Applications
LTCC Differential-Fed Broadband High-Gain and Narrow-Beam Planar Aperture Antenna for AiP Millimeter-Wave-Applications Open
The article presents a differentially excited low temperature co-fired ceramics (LTCC) based miniaturized planar aperture antenna, distinguished for its high gain and narrow-beam wideband characteristics, tailored specifically for mm-Wave …
View article: 60 W Class-E/F<sub>3</sub> Switching Power Amplifier With an Improved Second Harmonic Distortion of −49 dBc
60 W Class-E/F<sub>3</sub> Switching Power Amplifier With an Improved Second Harmonic Distortion of −49 dBc Open
This paper presents a Class-E/F3 switching power amplifier (SPA) with reduced second harmonic leakage using parallel resonant circuit in series for the second harmonics. The proposed Class-E/F3 SPA has a structure utilizing a series resona…
View article: Ku-Band GaN Power Amplifier MMIC for SATCOM
Ku-Band GaN Power Amplifier MMIC for SATCOM Open
In this study, a 3-stage power amplifier monolithic microwave integrated circuits (MMIC) in the Ku-band frequency range is designed using a 150-nanometer GaN-HEMT process. High efficiency is achieved by employing a high-pass structure at t…
View article: 3.7~4.0 GHz GaN-HEMT Doherty Power Amplifier Using Out-Phased Current Combining and Complex Combining Load Methods
3.7~4.0 GHz GaN-HEMT Doherty Power Amplifier Using Out-Phased Current Combining and Complex Combining Load Methods Open
This paper proposes a Doherty power amplifier (DPA) with an extended output power back-off (OBO) using out-phased current combining (OCC) and complex combining load (CCL) methods. When OCC or CCL is applied independently, the output impeda…
View article: A Design of Boost Converter With Time-Domain MPPT and Digital Self-Tracking ZCD for Thermoelectric Energy Harvesting Applications
A Design of Boost Converter With Time-Domain MPPT and Digital Self-Tracking ZCD for Thermoelectric Energy Harvesting Applications Open
This paper presents a DC-DC boost converter for energy harvesting. The time-domain maximum power point tracking (MPPT) technique implements to maximize the source's energy harvesting performance with no additional switch and time slot. Fur…
View article: Wireless Power Transfer System Using Class E/F3 Power Amplifier with Second Harmonic Reduction
Wireless Power Transfer System Using Class E/F3 Power Amplifier with Second Harmonic Reduction Open
In this paper, we present a high-efficiency wireless power transfer system with design and measurements, for three different types of receivers. The transmitter for the system uses a Class E/F3 power amplifier with second harmonic reductio…
View article: Design of a Load Modulated Balanced Amplifier with a Two-Stage Control Power Amplifier
Design of a Load Modulated Balanced Amplifier with a Two-Stage Control Power Amplifier Open
While an ideal Doherty power amplifier has a linear response, the load modulated balanced amplifier (LMBA) has a compressive response under ideal conditions. This inherent nonlinear characteristic is due to the lower power contribution of …
View article: Design of a 5.8 GHz GaN HEMT Class-F Rectifier Using Voltage Doubler
Design of a 5.8 GHz GaN HEMT Class-F Rectifier Using Voltage Doubler Open
In this study, the design and measurement results of a 5.8 GHz GaN HEMT Class-F rectifier using a voltage doubler were proposed. The proposed rectifier employed a voltage doubler for high-output dc voltage characteristics and applied the t…
View article: A Wideband Reflectarray Antenna for Satellite Application with Low Cross-Polarization
A Wideband Reflectarray Antenna for Satellite Application with Low Cross-Polarization Open
A double-layer element consisting of a spider-shaped structure on the top layer and a pair of concave arms with a circular ring on the middle layer is proposed for the wideband reflectarray with low cross-polarization characteristics. The …