This article presents a switched-transformer-based polar Doherty digital power amplifier (DPA) for deep back-off efficiency enhancement. A single-transformer-footprint parallel-combining transformer (PCT) combiner is introduced 1.3-3.5-GHz wide frequency coverage, dynamic load modulation at 0-/6-/12-/18-dB (PBO) levels, and an ultracompact die size. Implemented in 40-nm CMOS, the DPA powered by 1.1-V supply only occupies 0.7 × 1.15 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper proposes an enhanced sensorless vector control strategy using the predictive deadbeat algorithm for a direct-driven permanent magnet synchronous generator (PMSG). To derive favorable performances, is proposed. First, estimated back electromotive force (EMF), corrected by cascade compensator, was put into controller in order to improve system stability, while realize null-error tracking of stator current at same time. Subsequently, advance prediction based on Luenberger used...

Abstract Perfectly matched layer (PML) has been successfully used in various wave propagation simulations the Cartesian coordinate. But cylindrical or spherical coordinates, equations contain trigonometric terms, which make PML derived by complex stretching of coordinate axes hard to transform back time domain for numerical solving. To use 3D sections regional-scale seismic-wave simulation, we propose a trivial implementation implementing local The variables and spatial derivatives are...

Inhibitory immune checkpoint proteins promote tumor escape and are associated with inferior patient outcome. However, the biological functions regulatory roles of one its members, HHLA2, in microenvironment have not been explored.RandomForest analyses (371 cases), qRT-PCR (15 immunohistochemical staining (189 cases) were used to validate prognostic value HHLA2 hepatocellular carcinoma (HCC) patients. Bioinformatic further performed explore potential signaling pathways affected by HHLA2....

Sophisticated OFDM modulation schemes with high spectrum efficiency and data throughput in modern wireless communication systems often result a large peak-to-average power ratio (PAPR). Besides, standards like LTE, WLAN, NB-IoT, etc., require wide transmission range to accommodate various environments, devices function at low average output power. For better battery lifetime, it is critical improve the amplifier (PA) deep back-off (PBO) levels (e.g., 12/18dB or higher). Recently, several...

Distortion -less wideband modulated test signals are generated at high power using a new frequency domain method, called spectral digital pre-distortion (Spectral DPD). This technique extends the range of signal generators, reducing need for booster amplifiers to achieve good linearity, high-power The proposed first creates short slice waveform fast and accurate linearization reference plane. Then, pre-distorted created by DPD, generic memory-polynomial DPD model is identified. then applied...

This paper presents a transformer-combined dual-mode reconfigurable digital Class-D power amplifier (PA) that supports polar and quadrature transmitters (TXs). Transformer-based load modulation is employed to enhance the efficiency in both modes. The PA implemented 28-nm logic LP CMOS occupies only 0.56 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> active area. mode achieves 28.8-dBm peak with PAE of 30.8% at 22.4% 6-dB backoff....

This letter presents a wideband digital power amplifier (DPA) with Class-G technique to enhance back-off efficiency for Internet-of-Things (IoT) applications. The switched-capacitor topology is adopted high linearity performance. A matching network proposed achieve 0.54-0.95-GHz frequency coverage 802.11ah and narrowband IoT standards. measurement results demonstrate flat response only 0.5-dB deviation over 0.54-0.95 GHz. DPA achieves the peak output of 23.5 dBm 42.7% PAE 32.8% at 6-dB back...

This paper proposes a new bridge modular switched-capacitor-based ac-ac converter, which is intended to replace conventional transformers in commercial and residential applications, especially for microgrids. The main advantages of the proposed converter lie high efficiency power factor, bidirectional operation, capacitor voltage self-balancing ability. Another distinct merit its symmetric construction, with ripple charge/pump capacitors can be cancelled out, output will smooth significant...

This work presents a wideband digital polar transmitter (DPTX) with an integrated capacitor-digital-to-analog converter (C-DAC)-based digital-to-phase (DPC). A normalized CORDIC algorithm is introduced to convert the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$I/Q$ </tex-math></inline-formula> baseband signals constant envelope overcome PM bandwidth expansion issue and avoid amplitude modulation...

This paper presents a nonlinear analytical model for an inverter-based switched-capacitor Class-D RF power amplifier (SCDPA). The root causes of the SCDPA AMAM and AMPM nonlinearities are studied. major factors affecting identified as unequal on-resistances selected cell unselected cell. Specifically, time-varying resistance switch, different transistor responses during transition parasitic on supply path (IR drop) analyzed. Then, system-level result, like EVM spectral density, can be...

Dual-loop PI control strategy for LCL type grid-connected converter is usually used in wind power generation. Serious inrush current will be caused when runs on the rectified status at start time if no effective taken, so it necessary to improve startup performance and grid voltage feedforward method used. However, generation, of transformer's high side can't directly sampled. To deal with it, a proposed based filter capacitor branch's voltage. Firstly, mathematical model converter, under...

Abstract Charge-transfer polymerization is a new type of which has been developed within the last 20 years. Its essential character interaction between an electron donor (D) and acceptor (A) involved in initiating or/and propagating processes. Such attracted great deal attention, mainly due to three factors. First, it proceeds through novel or mechanism increasing interest for theoretical research. Second, since charge-transfer widely exists organic compounds, wide variety compounds may be...

This paper proposes an exponential class of dynamic binary choice panel data models for the analysis short T (time dimension) large N (cross section sets that allow unobserved heterogeneity (fixed effects) to be arbitrarily correlated with covariates. The derives moment conditions are invariant fixed effects which then used identify and estimate parameters model. Accordingly, generalized method moments (GMM) estimators proposed consistent asymptotically normally distributed at root-N rate....

This paper presents a layout extraction and verification methodology which targets reliability-driven I/O design for CMOS VLSI chip, specifically to guard against electrostatic discharge (ESD) stress latchup. We propose new device approach identify devices commonly used in circuits including MOS transistors, field diffusion well resistors, diodes silicon controlled rectifiers (SCRs), etc. Unlike other extractors, our extractor identifies circuit-level netlist based on the specified ESD...

This paper presents a dual-mode transformer-combined digital Class-D PA that supports polar and quadrature transmitters. Load modulation is employed to enhance backoff efficiency in both modes. The implemented 28nm Logic LP CMOS. mode achieves 28.8dBm peak power with the PAE of 30.8% at 22.4% 6dB back-off. obtains 26.3dBm 22.9% PAE. For 20MHz 64QAM WLAN signals, 23.35dBm Pavg, 23.2% PAE, -25.4dB EVM mode, 18.50dBm 12.3% -25.2dB mode.

This paper presents a wideband digital polar transmitter (DPTX) with integrated capacitor-DAC-based constant-envelope digital-to-phase converter (DPC). The switched-capacitor DAC topology is adopted to improve the linearity. harmonic rejection and cell-reused techniques are employed reject 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rd</sup> /5 xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> -order harmonics reduce power consumption,...

Article Free Access Share on Efficient transient electrothermal simulation of CMOS VLSI circuits under electrical overstress Authors: Tong Li Analysis Product Division, Avant! Corporation CorporationView Profile , Ching-Han Tsai Dept. Electrical and Computer Engineering, Univ. Illinois at Urbana-Champaign Urbana-ChampaignView Sung-Mo Steve Kang Authors Info & Claims ICCAD '98: Proceedings the 1998 IEEE/ACM international conference Computer-aided designNovember Pages...

With the development of renewable energy generation technologies, line-commutated-converter based high voltage direct current (LCC-HVDC) presents characteristics a weak AC system at sending end, which has certain negative impact on small-signal stability LCC-HVDC system. In order to analysis under end and factors affecting stability, small signal model is built by state space model. Based this, effects strength, phase-locked loop (PLL) DC controller parameters performance are analyzed. The...

Abstract The photo‐induced “charge‐transfer” copolymerization of various donor monomer‐acceptor monomer pairs was studied by irradiation their CT complexes with 365 nm light. influence the and acceptor strength on rate polymerization shows that stronger donor/weaker or weaker donor/stronger favor copolymerization. proposed initiation mechanism involves formation an excited complex, which then collapses to tetramethylene diradical for free radical copolymerizations.

A CAD tool set for VLSI CMOS I/O circuit design is developed. It includes a simulator, layout extractor and substrate resistance solver. This paper presents new circuits method modeling the resistance. With these tools, first time, full can be simulated accurately at circuit-level with substrate-coupling effects taken into consideration. The tools are demonstratively applied to an industrial circuit.

This paper proposes an exponential class of dynamic binary choice panel data models for the analysis short T (time dimension) large N (cross section sets that allows unobserved heterogeneity (fixed effects) to be arbitrarily correlated with covariates. The derives moment conditions are invariant fixed effects which then used identify and estimate parameters model. Accordingly, GMM estimators proposed consistent asymptotically normally distributed at root-N rate. We also study conditional...