Most systems which require phase information use mixers somewhere in the measurement or comparison of the phase information. Theoretically, any mixer with a dc coupled port could be used as a phase detector. Practically, however, mixers often display some very non-ideal characteristics (e.g., dc offset) when used as phase detectors. The actual mixer chosen for a particular application will ofte...

In this paper, we develop a 94-GHz single balanced mixer with low conversion loss using planar Schottky diodes on a GaAs substrate. The GaAs Schottky diode has a nanoscale anode with a T-shaped disk that can yield high cutoff frequency characteristics. The fabricated Schottky diode with an anode diameter of 500 nm has a series resistance of 21 Ω, an ideality factor of 1.32, a junction capacitan...

We describe a new quasi-optical SIS mixer designed for efficient radiation coupling. The mixer uses a twinslot antenna which has the advantages of a good beam pattern and a low impedance. The radiation and impedance characteristics of the antenna were obtained from a moment-method calculation. Tapered superconducting microstrip transmission lines are used to carry the radiation from the slot an...

To achieve high mixing efficiency in microfluidic devices, complex designs are often required. Microfluidic devices have been evaluated with light and confocal microscopy, but fluid-flow characteristics at different depths are difficult to separate from the en face images produced. By using optical coherence tomography (OCT), an imaging modality capable of imaging 3D microstructures at micromet...

In this thesis the linearity characteristics of passive mixers for wide band homodyne receivers are studied. The circuits are simulated using Cadence Spectre with models from a 65 nm RF/Analogue CMOS process. Linearity dependence of common mode voltage, load impedance, switch network arrangement and local oscillator drive circuitry is studied and analysed. The thesis also covers methods for the...

As an extension of our previous study, the flow and mixing characteristics of a serpentine mixer in non-creeping flow conditions are investigated numerically. A periodic velocity field is obtained for each spatially periodic channel with the Reynolds number (Re) ranging from 0.1 to 70 and the channel aspect ratio from 0.25 to one. The flow kinematics is visualized by plotting the manifold of th...

Laminar flow and mixing of a Newtonian fluid are characterized in a four-element Koch-Glitsch SMX static mixer. The computational analysis on a fine, unstructured mesh containing more than 3.5 million tetrahedral elements led to high-resolution numerical data for ®elocity and pressure. Computed pressure drops agreed excellently with those in the literature. The flow in this static mixer is esse...