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This work presents a compact ADC architecture capable of digitizing the signals received by every individual element of a 2D ultrasound transducer array. An element-matched layout of 150 μm × 150 μm is realized by exploiting each piezo-electric transducer element not only as the signal source, but also as the electro-mechanical loop-filter of a continuoustime band-pass ΔΣ ADC, thus minimizing the...
In this work1 we present the design of a fully integrated wideband high efficiency power amplifier for 5G applications. The amplifier consists of two single ended common source stages, with a class-J power stage in the 28nm CMOS FD-SOI technology. Post-layout simulation results show a broadband behavior of the amplifier over 12 GHz of bandwidth with a saturated power of 16.2 dBm and a peak power added...
In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
We have proposed an open terminated folded inverted-L antenna (FILA) with slits. In order to miniaturize the FILA, several slits are employed on the substrate surface. Folded structure is used for broadbanding. Design of the FILA to achieve broadband characteristics is shown. Simulation and measurement are implemented, and comparison of the results are evaluated. Finally, we calculate the product...
In this paper, the size of a log-periodic dipole array antenna is reduced using partially applied folded planar helix dipole elements. The proposed antenna shows almost no gain deterioration in the entire operating bandwidth even though its size is reduced by 39 %. Due to its reduced size and lightweight characteristics, it is expected that the proposed antenna could be effectively utilized in the...
A quad-band energy harvester is proposed here. The harvester is formed of rectifiers and matching circuits at different frequency bands: GSM-900 (890-960 MHz), GSM-1800 (1800-1870 MHz), ISM 2.45 GHz (2.45-2.457 GHz) and LTE-band 7 (2.6-2.67 GHz). The harvester is formed of two dual-band matching circuits and two rectifiers instead of the conventional design with four single-band matching circuits...
With the improvement in the power electronic technologies, medium voltage dc (MVDC) electrical distribution systems are being considered for on-shore and off-shore applications. These future MVDC electrical distribution systems are expected to provide the possibility of easy interfacing of the renewable energy sources, improving the dynamics of the system and also help in reducing the carbon footprint...
One of the major feature of DC microgrids is its high penetration of power electronic converters, as a result, the system inertia becomes a problem. In this paper, an admittance-type droop control with additional capability of introducing virtual inertia to the system. With the proposed method, each energy source will also contribute virtual inertia to the system, thus improving transient response...
Current-controlled LCL-filtered inverters are usually paralleled together for interconnecting the renewable energy resources into the grid. When the inverter output impedance is not well designed, the harmonic circulating currents out of the control bandwidth may be easily aroused. To reveal this resonant phenomenon and to enhance the stability of the parallel system, this paper builds the parallel...
In this paper, a transmission line (TL) resonator based composite right/left-handed (CRLH) leaky-wave antenna (LWA) is investigated. In order to enhance input impedance bandwidth, bandpass filter synthesis technique is utilized to design matching sections. An example LWA with a fractional bandwidth of 0.4 is designed and fabricated, and the measured results agree well with numerical results.
We propose a plug-and-play realization of the virtual infinite capacitor (VIC), which is an electronic circuit recently proposed in the literature for DC voltage filtering. The VIC is meant to replace large, expensive and unreliable electrolytic capacitors, and is mainly intended for applications where random fluctuations of the DC bus voltage may occur (i.e., the VIC is not tuned to one particular...
This paper presents a fast-response full-wave inductor current sensor for a DC-DC converter operating in 10 MHz switching frequency. It can achieve high sensing accuracy better than 93% with inductor current varying from 100mA to 2.1 A. Also, the time response of proposed current sensor has been greatly improved and achieved < 8 ns for sensing full wave inductor current with a low transition spiking.
This paper presents a new topology for a triband Doherty power amplifier (DPA). It utilizes a triband impedance inverter, realized using a T-network, to synthesize a triband power combining network. This approach enables Doherty load modulation around three separate operating frequencies with suitable fractional bandwidths. For proof of concept, a demonstration DPA operating at 1200, 1800, and 2700...
This paper presents the design of a broadband coupled-line matching network for two dissimilar port reference impedances. The proposed structure is composed by a series transmission line and shunt coupled-line section. A direct design approach is discussed in detail and employed to devise of this matching network with wideband frequency response. To practically validate, one matching circuit with...
A compact square-shaped circularly polarized antenna is presented for pico-satellite application. Four dipole antennas are integrated with a phase delay line on a Rogers RO4003C to operate at 2.4 GHz with a dimension of 0.724λg (55mm) × 0.724λg (55mm) × 0.0112λg (0.85mm) based on the lowest guided wavelength. Reflection and radiation performance exhibited are acceptable, with an impedance bandwidth...
This paper presents the design of a novel microstrip divider/combiner using T-type networks. Multiple step dividers were analyzed and designed, starting from the S-parameters representing the N-ports, their electrical specifications, and ending with full-wave simulations. We present here, two different designs with this technology, for 4 and 8 output ports. To validate the design, two prototypes working...
One of the biggest challenges faced in the characterization of wide-band gap (WBG) semiconductors is the accurate measurement of the current through the device. Most measuring techniques available do not have the necessary bandwidth to capture the high-frequency current content in such systems. Many of the solutions that do have the necessary bandwidth introduce a “choke-point” into the system by...
The characterization of transducers ultimately play an important role in determining the quality of the image. Electrical impedance, pulse-length, bandwidth, and sensitivities are parameters commonly used to characterize the transducer. An achievement of this paper is that these parameters of two single transducers one element have been characterized by combining the measurement results in pulse-echo...
Fluctuation Enhanced Sensing is a well known technique, based on noise measurements, to improve sensitivity and selectivity for chemical/biological sensing. Trans-impedance amplifiers (TIAs) are the natural choice as front-end for the measurement of the low frequency noise (LFN) generated by the sensor. In this work we propose a low-noise TIA topology which allows maintaining a large bandwidth also...
For monolithically integrated vector network analyzers (VNA) a broadband multi-octave receiver is shown, which exhibit a very wide frequency range from 1–32 GHz. It consists out of a low noise amplifier (LNA) and an active mixer, followed by an output buffer. With the presented design, a maximum achievable conversion gain (CG) of 16.6 dBm can be reached. The main design-goal is a very flat deviation...
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