GaN Microwave DC–DC Converters

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Semipolar InGaN/GaN Converters for Bright Green Emission and Stripe LEDs 59 Semipolar InGaN/GaN Converters for Bright Green Emission and Stripe Light Emitting Diodes

Optically pumped green converter structures based on three-dimensional (3D) inverse pyramids were studied. The green emission intensity is determined by the conversion rate ηc and the absorption fraction ηa, indicating the InGaN/GaN quantum well (QW) crystal quality and its absorption capability, respectively. 15 was found to be the optimal QW number based the epitaxial condition for that serie...

Reducing Distortion in Microwave Analogue to Digital Converters

It is now possible to digitise microwave signals using 8 bit ADCs and sampling frequencies in excess of 1 GHz. This opens up new opportunities for the measurement and analysis of these broadband signals, however an 8 bit ADC has a very limited dynamic range. This paper discusses Additive Dither and Frequency Shift Dither techniques which can be used to extend the dynamic range of the ADC and it...

Wideband Monolithic Microwave In Converters with GaAs mHE

We present monolithic microwave integrated circuit (MMIC) frequency converter, which can be used for up and down conversion, due to the large RF and IF port bandwidth. The MMIC converters are based on commercially available GaAs mHEMT technology and are comprised of a Gilbert mixer cell core, baluns and combiners. Single ended and balanced configurations DC and AC coupled have been investigated...

Crack opening profile in DCDC specimen

The opening profile of the cracks produced in the Double Cleavage Drilled Compression (DCDC) specimens for brittle materials is investigated. The study is achieved by combining Finite Element simulations of a DCDC linear elastic medium with experimental measurements by crack opening interferometry on pure silica glass samples. We show that the shape of the crack can be described by a simple exp...