In this paper, an ultra-low-noise amplifier with frequency band switching capability is designed, simulated and fabricated. The two frequency ranges of this amplifier consist of the 2.4 to 2.5 GHz and 3.1 GHz to 3.15 GHz frequency bands. The designed amplifier has a noise figure of less than 1dB, a minimum gain of 23 dB and a VSWR of less than 2 in the whole frequency band. The design process s...

A Josephson parametric amplifier (JPA) is executed in a three-dimensional (3D) microwave cavity by coupling it to superconducting quantum interference device (SQUID) that embedded two-dimensional resonator. The JPA activated three-wave mixing configuration injecting ac magnetic flux, at twice the 3D frequency, into SQUID. An 8.3 GHz measured non-degenerate phase-insensitive which yields gains e...

t is reported that millions of people are suffering from some kind of hearing impairment [1]. The number is climbing due to the increasing portion of elderly people in the world's population. While hearing loss is usually caused by permanent mechanical damage to the ear, there is no medicine to reverse it, and surgery offers little help. Thus, electronic hearing aids or pros-thetics are, so far...

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[51 Bondwire inductors 0.3 3 5 * 1.2 0 . 7 2 ~ 0.32 5.1 7 4.7 c -6 4 9 3 54 Abstrncf A CMOS distributed amplifier (DA) covering 0.6 to 22 GHz is presented in this paper. Cascode gain cells and m-derived matching sections are used to enhance the gain and bandwidth performance. The DA chip achieves measured gain of 7.3 f 0.8 dB with chip area of 0.9 x 1.5 mm’ including testing pads. The amplifier...

A novel active feedback frequency compensation scheme is presented in this work. Based on the proposed technique, an amplifier with two main poles in its frequency bandwidth can be easily compensated by introducing a pole-zero pair in a local feedback. The proposed method is mathematically analyzed and then based on the derived formulations, a design procedure is established. The capability of ...

In this paper, an analytic solution is presented using differential transform method (DTM) for a class of wave equation. The emphasis is on the nonlinear two-dimensional wave equation. The procedures introduced in this paper are in recursive forms which can be used to obtain the closed form of the solutions, if they are required. The method is tested on various examples, and the results reveal ...

The permeability and tortuosity of pore-scale two and three-dimensional random porous media were calculated using the Lattice Boltzmann method (LBM). Effects of geometrical parameters of medium on permeability and tortuosity were investigated as well. Two major models of random porous media were reconstructed by computerized tomography method: Randomly distributed rectangular obstacles in a uni...