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A compact dual-frequency antenna with two-port excitation and large frequency ratio is presented. It consists of a circularly-polarized (CP) microstrip patch antenna at 2.4 GHz and a linearly-polarized (LP) substrate-integrated cylindrical dielectric resonator antenna (DRA) at 60 GHz, resulting in a large frequency ratio of as high as 25. The two antenna parts are designed on a single substrate, giving...
A millimeter-wave fully differential power amplifier with broadband performance was implemented in 90-nm CMOS technology. The proposed circuit employed a three-dimensional layout for a cascode power cell to reduce the sensitive parasitic effect. The proposed power amplifier provides a 3-dB bandwidth region ranging from 44.7 to 58.8 GHz, with a maximum small-signal gain of 21.6 dB at 49 GHz. In addition,...
Fully integrated optoelectronic interfaces in CMOS technology are a very interesting option for optical smart sensors because they are a cost-effective and compact solution. However, CMOS standard n-well/p-bulk differential photodiodes (DPDs) are the bottleneck in this field due to their inherent limited bandwidth which falls below 10MHz in 65nm CMOS. This work presents a new equalization approach...
Several wideband millimeter-wave dielectric reflectarray antennas are discussed in this paper. Different phase distributions are realized by changing the shape or material of the array element. Three dielectric reflectarray of 20×20 elements operating at 100GHz are compared. The 1dB gain bandwidths of the dielectric reflectarray are larger than 10% and up to 40%. As compared to the microstrip reflectarray,...
In this paper, flexible frequency division duplex (FDD) and time division duplex (TDD) schemes are considered in FDD spectrum. With FDD spectrum, there is a paired uplink (UL) carrier with each downlink (DL) carrier, each carrier with the same bandwidth. Because equal resources are provisioned for the DL and UL, FDD spectrum is not well suited for asymmetric DL/UL traffic. While the FDD UL-paired...
A Study on the Performance characteristics of UWB antenna using two different substrate is focused on this paper. Rectangular patch antenna is used in this design. The two different substrates used for designing the antenna for UWB application are FR4 and Jeans fabric. Certain optimization techniques is introduced to obtain the entire range of UWB frequency band. It consist of 3 steps such as introducing...
In this paper, bow-tie antenna with defected ground structure (DGS) has presented. The radiating element is bow-tie antenna, two concentric ring slots are presented on it for producing the circular polarization (CP). Rectangular patch is loaded to bow-tie antenna for enhance the gain. On the ground plane four equal bow-tie slots are considered for enhancing the impedance bandwidth upto 10.3%. It is...
In this work, we present a miniature multi-layered patch antenna for K-band applications. The size of the antenna has been optimized by using two substrates layers, introducing a rectangular probe between the layers, and insertion of an air-filled cavity into the lower substrate. Analysis and modeling were performed using the HFSS (High Frequency Structure Simulator) simulator based on the finite...
This paper presents a 150GHz fully differential amplifier with gain boosting and optimized Marchand balun matching networks in a 65nm CMOS technology. The optimized Marchand balun overcomes the self- resonance problem that the conventional balun suffers, and reduces the size as well. The over- neutralization technique is proposed and utilized in order to boost the gain of a differential pair without...
In this paper a low power amplifier for bio-signal acquisition is described. The design takes benefit of UTBB-FDSOI 28nm technology and exploits bulk under the buried oxide as a second gate of FET device. This amplifier exhibits low supply current of 25nA, while keeping input noise at 24 µV in bio-signal frequency band. The gain of the amplifier is 71dB.
A conventional symmetric Zig-zag antenna is improved by adding a shunt shaped dipole at the feeding terminals or a shaped dipole as parasitic reflector, this dipole results in an increment of radiated gain in forward direction while remaining the wider frequency bandwidth of Zig-zag antenna. By means of the method of moments with piecewise-sine bases and Galerkin's procedure, the Zig-zag structure...
With the development of high-speed mixed-signal circuits, signal timing for the overall system have a crucial impact. Analog delay circuits are widely used in high-speed circuits. In this paper, a compact gm-c active delay is used, while a delay reference loop is used to adjust the delay time. The design and simulation are implemented by 0.13 um SiGe BiCMOS. The chip occupies 0.40 mm2 die area, consuming...
This article is presented the bandwidth expansion of double-horn antenna with a squared probe for wireless communication applications by using the basic structure of a monopole antenna with a double-horn waveguide to increase the gain and spread the applied frequency in the desired spectrum. The entire structure of the antenna was fabricated on a metal sheet with a thickness of t = 0.2 mm. It was...
This paper presents a novel technique to design a programmable bandwidth single-ended output CMOS operational amplifier using a serial digital interface. The circuit topology enables the programming of the value of a negative Miller capacitance around first amplification stage and programming of the value of a Miller capacitance around the second amplification stage. Therefore, a controllable frequency...
In the proposed work subthreshold analog performance of an amplifier, designed using Fully Depleted Silicon On Insulator (FDSOI) MOSFETs is done. Effect of back oxide (BOX) voltage variation on analog performance of subthreshold amplifier is observed. Gain, Bandwidth, linearity of an optimized amplifier against different design parameter is presented. The proposed work provides a bandwidth of 10.5...
The need in today's wireless applications is to design antennas that are compact, robust and effortless to integrate with RF circuit components. Microstrip patch antenna is one such type which satisfies these requirements. But the two main performance parameters of an antenna namely the gain and the bandwidth are near to the ground for patch antennas. Usually the gain range of a patch antenna is 1–2dB...
In this paper, two techniques are proposed using bulk-driven approach, which improves the performance of OTA. The proposed OTAs are designed and simulated on Tanner EDA Tool using 0.18 μm standard CMOS process technology. The effectiveness of using the current-shunt auxiliary amplifier, folded-cascode amplifier and replica chain self-biased technique in bulk-driven OTA results in improved DC gain...
There is a great development in wireless communication were wireless plays a important role in all day to day things starting from home appliances to military application. Antenna is a device that plays a major role in these applications. Wearable antenna have been welcome nowadays due to the UWB that promises high data rate with wider bandwidth along with low power consumption. Textile antenna is...
Most artificial bandwidth extension (ABE) algorithms are based on the classical source-filter model of speech production. This approach generally requires the dual extension of each component through independent processing. Alternative approaches reported recently operate on the spectrum. With human perception thought to be largely insensitive to phase, most such approaches focus on the extension...
This paper presents design considerations for the development of wide-scanning antennas for on-craft satellite communications. A scanning coverage of 80° is required for this application over a 15% fractional bandwidth in Ka-band. A solution based on a phased array illuminating a passive superstrate is identified as the most promising. A fully-electronic beam-scanning is considered in order to reduce...
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