摘要:

In0.52Al0.48As/InxGa1‐xAs(x=0.53 lattice‐matched, andx=0.6 pseudomorphic) high electron mobility transistor (HEMT) structures are grown by a Riber‐32P MBE system on (100) InP:Fe substrates. Devices with the gate‐length of 0.8μm show excellent channel pinch‐off characteristics fromthe Ids‐Vdscurves. The saturation current density biased atVgs=0.5V is 480 mA/mm for HEMTs(x=0.53) and 550 mA/ mm for pseudomorphic‐(PHEMTs,x=0.6). A peak extrinsic DC transconductance (gm) increases from 342 mS/mm to 395 mS/mm as the In composition increases from 53% to 60% for In0.52Al0–48As/ InxGa1‐xAs HEMTs. Microwave characteristics demonstrate that a current gain cutoff frequency (fT) also increases from 22 GHz to 25 GHz and a maximum oscillation frequency (fmax) increases from 60 GHz to 83 GHz, at 300K. This demonstrates that with the increase of In content in InxGa1‐xAs channels, device performance is dramatically enhanced, which can be used for microwave circuit applications.

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677735

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This paper proposes using a mixed biasing distribution in Importance Sampling for estimating the bit error rate (BER) via Monte Carlo simulation. The proposed mixed biasing distribution is more robust than the commonly used Gaussian tail distribution when the signal or the threshold setting is disturbed by a uniformly distributed random noise. In this paper the robustness is quantified by the mean squared error.

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677736

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The FDTD method is used to calculate the specific extinction cross section of the powder of brass 70Cu/30Zn with 1.35×104to 2.56×105particles in the infrared frequency range. A digitized model of body‐center‐like structures is used for the calculations of specific extinction cross‐section. From theoretical calculations, the value of a specific extinction cross section of the powder of brass 70Cu/30Zn is between 0.14 to 4.0 m2/g. While the experimental measurement shows the value of specific extinction cross section to be between 0.58 to 3.78 m2/g. The theoretical results concur with those obtained from the experimental measurement for the cell sizes of particles in the range of 0.05 to 0.4 p.m. There are some differences between the theoretical value and measurement data of specific extinction cross section for other particle sizes outside the range of 0.05 to 0.4μm.

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677737

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

In the paper “Robust Stability Analysis for Linear Uncertain Time‐Delay Systems with Delay‐Dependence"[1], a delay‐dependent stability condition is developed for testing the stability of linear uncertain systems with time‐delay. There are several typing errors and some expressions should be modified.

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677738

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The Laplace equation, which is used to describe the problem of two‐dimensional heat conduction with appropriate boundary conditions at steady state, is solved in this work by applying the method of separation of variables. The primary objective of this work involves discussing the effects of the constant value of the separation of variables (p) and the sequential order of substituting boundary conditions on the solution. Without appropriately arranging the sequential order of substituting the boundary conditions, the solution for non‐zero constant values of separation of variables (p) can not be obtained. For a zero value for the constant of the separation of variables, the solution obtained is trivial or does not exist. Solutions in different forms are obtained by using different values for the constant of the separation of variables (p) and for the sequential orders of substituting the boundary conditions.

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677739

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0253-3839    

DOI:10.1080/02533839.1995.9677724

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor