A5074157763- Radio Frequency Integrated Circuit Design
- Advanced Power Amplifier Design
- PAPR reduction in OFDM
- Full-Duplex Wireless Communications
- Advancements in PLL and VCO Technologies
- Wireless Power Transfer Systems
- Bone Tissue Engineering Materials
- Superconducting and THz Device Technology
- Knee injuries and reconstruction techniques
- Microwave Engineering and Waveguides
- Electrospun Nanofibers in Biomedical Applications
- CCD and CMOS Imaging Sensors
- Interconnection Networks and Systems
- Cancer Mechanisms and Therapy
- Cancer-related Molecular Pathways
- Low-power high-performance VLSI design
- Silicon Carbide Semiconductor Technologies
- Electromagnetic Compatibility and Noise Suppression
- Semiconductor Quantum Structures and Devices
- Hepatocellular Carcinoma Treatment and Prognosis
- Analog and Mixed-Signal Circuit Design
- Multilevel Inverters and Converters
National Taiwan University
2011-2022
MediaTek (Taiwan)
2018
MediaTek (China)
2012
HRL Laboratories (United States)
1987
In recent years, the increasing popularity of mobile devices, such as smart- phones and tablets, is driving demand for integrating multiple radios on a single SoC to reduce cost, form factor external BOM. These devices require ubiquitous wireless connectivity, which means concurrent operation with different radios. While brings excellent user experiences, there exist great challenges in dealing radio co-existence an SoC. For example, between WiFi BT, both oper- ating 2.4GHz ISM band, sets...
This letter presents a method for improving the efficiency of power amplifier (PA) under load mismatch by recycling reflected power. By configuring PA as balanced PA, will be directed to isolation port 90 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{\circ}$</tex> </formula> hybrid coupler. The can then rectified and converted back dc assist in supplying PA. A prototype system was built validate...
Interpolation involves the process of estimating values at positions in between adjacent samples, which has very fundamental and applied implications signal processing communication systems. In this work, a new method cubic spline interpolation (CSI) is proposed derived mathematically from input samples respecting time-domain boundary conditions, corresponding piecewise polynomials are optimized frequency domain to achieve good spectral properties. A comparative analysis several prior arts,...
Electrospun materials are widely used for functional tissue engineering its robust production and biomimetic properties. Several issues persist, however, including heterogeneous cell distribution, insufficient matrix elaboration/accumulation, limited construct size. We took three synergistic approaches to address these by modifying the chemical microenvironment seeded cells. Instead of commonly fibronectin, we demonstrated that type I collagen (COL) coating, facilitated polydopamine...
The pulse-modulated polar transmitter (PMPT) uses envelope information to pulse modulate phase implement highly linear and efficient transmitters. Previous implementations of the PMPT successfully achieved bandwidths up 5 MHz. However, as bandwidth signal increases, nonidealities limit performance this architecture. are predominantly aliasing from pulsewidth modulation (PWM) distortions switching, which degrade spectral performance. By using aliasing-free digital PWM pre-distortion...
The pulse-modulated polar transmitter (PMPT) uses the envelope information to pulse modulate phase implement a highly linear and efficient transmitter. bandwidth of PMPT is primarily determined by pulsewidth modulation sampling frequency information. For wide applications such as long-term evolution (LTE), finite rise fall times RF pulses distort In this paper, nonideal are analyzed an correction method proposed reduce distortion in using architecture. validation, cellular-band prototype...
This paper presents a wideband power recycling technique for pulse-modulated polar transmitters (PMPTs). The allows unwanted out-of-band modulation spurs in PMPTs to be rectified and recovered back the supply efficiency improvement. By configuring amplifiers as balanced amplifier with dual-phase digital pulse-width modulation, odd can extracted directly from isolation port of output-combining quadrature coupler. Using proposed architecture, prototype transmitter achieved 59.1% drain at an...
This letter presents a broadband power amplifier (PA) for improving the linearity of an aliasing-free pulse-modulated polar transmitter. For this letter, input matching deep class-C PA is designed. The bandwidth over 650 MHz around center frequency. To validate proposed system, prototype transmitter system constructed using commercially available components. overall achieved output level 35.5 dBm with power-added efficiency 32.8%. Spectral requirements 10-MHz 64-QAM long-term evolution...
MediaTek INFO Link (M-Link) is worldwide first successful homogeneous DIE-to-DIE data link for high-speed networking application. Considering benefits from large on-die capacitance of core-power domain, merged power domain and adopted. However, in order to sustain over 250W external interference internal SSO noises, optimization whole band target impedances against these noises becomes one major challenges. In this paper, a systematic approach design M-Link the extreme condition proposed....
This letter presents an aliasing free multilevel pulse modulation (MLPM) architecture to implement a linear Doherty power amplifier (PA). is believed be the first reported results of this type achieve amplification rather than usual situation continuous amplitude modulated carrier and load modulation. Our show that both high efficiency good linearization can achieved with simple memoryless digital predistortion. operation MLPM have benefits in due discrete drive as less dissipated by PA,...
The pulse-modulated polar transmitter (PMPT) uses radio-frequency (RF) phase modulated signal with pulse-width envelope to drive a power amplifier (PA) as switch achieve high linearity and efficiency. However, the bandwidth increases, various non-idealities limit performance of PMPT architecture. In this paper, Gibbs-phenomenon reduction filter is proposed partial Fourier series digital modulation (PWM) such that pulsed more immune distortion in nonlinear high-efficiency RF PAs. For...
This letter presents a study of thermal memory effect reduction for pulse-modulated polar transmitters (PMPTs). PMPTs using pulse modulation have shown very low effects even when operated at high-power levels in the previous literature. In this letter, simulations were performed to modulation. The simulation results show that not only reduces increase temperature but also variation. Temperature variation is main source thermal-related since change affects parameters such as internal...
This paper presents a new method of reactive-combiner structure to be used as part multiphase digital pulsewidth modulated polar transmitter (DPWMPT). It overcomes the limitations previous implementations pulse-modulated related terminating modulation (PWM) harmonics located outside passband, thereby improving both PWM harmonic suppression by using aliasing-free technique and increasing overall efficiency reactive combining. For validation, prototype was implemented tested with 64-QAM 20-MHz...
This paper presents a pulse-modulated power-recycling polar transmitter with dual-phase digital pulsewidth modulation for the 4G long term evolution (LTE) system. implementation is capable of achieving high linearity and efficiency by recycling power residual spurs from pulse modulation. A prototype balanced system constructed commercially available components. Measurements using 16-QAM 10-MHz bandwidth LTE signal at 836.5 MHz, it achieves 17.3% improvement 21-dBm output level while passing...
This paper presents a 2-5 GHz mMIMO RF front-end module that includes an switch followed by two stages of low-noise amplifiers (LNA). The and LNAs are designed in 0.25um GaAs technology as ICs, placed multi-chip (MCM) housed LGA package. FEM achieves 47 dBm peak power handling failsafe (FS)/TX mode, 1.35 dB noise figure, 31.5 OIP3 17 P1dB at 3.5 GHz. It also switching speed 230 ns when tested with very low frequency (1 KHz) toggle signal, typical requirement on these FEMs. excellent is...
In this letter, a wide bandwidth power amplifier (PA) using pulse modulation is presented. Pulse significantly reduces the amount of thermal memory. However, with large signal bandwidth, significant matching-related memory effect exists. A compensation equalization filter proposed to compensate in-band gain/phase variation, such that simple memoryless digital predistortion (DPD) can still be utilized. prototype transmitter system constructed commercially available base station PA for...
Multioctave, multithrow active switches have been developed to operate from 2 18 GHz. A SPDT switch and a SP4T constructed. The demonstrate 4 dB forward gain 60 of isolation between the input common port. employ monolithic distributed amplifiers obtain gain.
A multilevel Gibbs-phenomenon-reduced digital pulsewidth modulation for polar transmitters is presented. This technique can be applied to base station Doherty power amplifiers achieve high efficiency while requiring only low complexity predistortion algorithms. prototype transmitter system constructed using a commercially available DPA validation. Measurements are performed 256-QAM 5GNR downlink multi-carrier modulated signal with an instantaneous bandwidth of 60-MHz. Using two memory taps...
Abstract Background & Aims: Nintedanib, a triple angiokinase inhibitor, is currently being evaluated against advanced HCC in phase I/II clinical trials. Here, we report the underlying molecular mechanism by which nintedanib (BIBF-1120) induces an anti-HCC effect. Methods: cell lines were treated with or its derivative (ΔN) and apoptosis, signal transduction, phosphatase activity analyzed. Purified SHP-1 proteins cells expressing deletion N-SH2 domain D61A point mutants used to...
This paper presents a novel digital combining method to implement multilevel pulse modulation polar transmitter (PMPT) for 5G NR base station applications. Using pulse-width on switch mode power amplifiers (PAs) is promising PA efficiency improvement. Whereas using the interleaved architecture can eliminate unwanted harmonics. Previous PMPT implementations used passive combiners combine multiple outputs, this proposes be performed digitally prior PAs. It was shown proposed no longer...