The performance of the chalcopyrite material Cu(In,Ga)Se2 (CIGS) used as an absorber layer in thin-film photovoltaic devices is significantly affected by the presence of native defects. The deep-level transient spectroscopy (DLTS) technique is used in this work to characterize the defect properties, yielding relevant information about the defect types, their capture cross-sections, and energy l...

A broadband metamaterial absorber working in the X-band is designed and fabricated by 3D printing this study. This structure capable of nearly absorbing power incoming waves (more than 90%) frequency band starting from 7.1 to 13.8 GHz. based on an infinite array conductive ribbons, thickness just 0.1? for minimum (without considering ground layer). circuit model transmission line theory are use...

Burn-in is accepted as a way to evaluate ageing effects in an accelerated manner. It has been suggested that burn-in stress may have a significant effect on the Negative Bias Temperature Instability (NBTI) of subthreshold CMOS circuits. This paper analyses the effect of burn-in on NBTI in the context of a Digital to Analogue Converter (DAC) circuit. Analogue circuits require matched device pair...

Despite excellent high frequency and high speed performance, current-feedback operational ampli ̄ers (CFOAs) generally exhibit poor common-mode rejection (CMRR) properties, which limit their utility [Analogue IC design: The current mode approach, IEE Circuits and Systems Series, Peter peregrinus, 1990]. A novel current feedback operational ampli ̄er (CFOA) with improved performance is presented. ...

The present paper introduces a novel analogue nonlinear circuit that exhibit rich dynamics. The proposed fourth order circuit is based on a piecewise linear algebraic nonlinear function, with discontinuity in the origin. The dynamic part of the system is developed by closing two feedback loops around a differential amplifier, which drives the nonlinear circuit. For a wide range of parameter val...

Custom design of integrated circuits is required for the development of digital standard-cell and bit-slice libraries, analog circuits, and other specialized circuits that are not commercially available. Teaching students the design and verification flow at this physical level is valuable in that it provides the understanding and skills they will need to perform these functions in their subsequ...

D. J. Bailey, *a M. C. Stennett, a B. Ravel, D. Grolimund and N. C. Hyatt A suite of uranium brannerites for the disposal of MOX residues, formulated (U0.9Ce0.1)1 xMxTi2O6 (M 1⁄4 Ca and/or Gd), were prepared using a mixed oxide route under oxidising, inert and reducing atmospheres (air, argon andH2/N2). Gd was added to act as a neutron absorber in the final Pu bearingwasteformandCe added to fun...

A new first order voltage mode all-pass filter circuit using two differential difference current conveyors (DDCCs) (with suppressed output stages) as active elements and two passive components is proposed. The given circuit enjoys the features of high input impedance and low output impedance, which is desirable feature for voltage-mode circuits. In spite of employing two active elements the cir...