Abstract:
In accordance with an embodiment of the invention, there is provided an apparatus for characterizing and identifying a human. The apparatus comprises a light imaging device that images topography of a surface of a portion of human anatomy, and an infrared imaging device that images infrared radiation of the same portion of human anatomy. The light imaging device and the infrared imaging device are rotatable about at least one axis, each of the at least one axis extending through the portion of the anatomy.
Abstract:
A field effect transistor (FET) having at least two independently biased gates can provide uniform electric field in the channel region of the FET. The same AC voltage may be applied to each gate for modulating the FET. One of the gates is positioned closer to the channel region than the other gate. Such a FET allows tailoring the electric field in the channel region of the FET so that it is substantially uniform. The FET exhibits desirable performance characteristics, including having a constant transconductance.
Abstract:
A field effect transistor (FET) having at least two independently biased gates can provide uniform electric field in the channel region of the FET. The same AC voltage may be applied to each gate for modulating the FET. One of the gates is positioned closer to the channel region than the other gate. Such a FET allows tailoring the electric field in the channel region of the FET so that it is substantially uniform. The FET exhibits desirable performance characteristics, including having a constant transconductance.
Abstract:
Methods and systems for generating near-infrared (NIR) images of biological targets are discussed. In one aspect, one or more radiation sources illuminate a target, with one or more detectors receiving the transmitted radiation. Such equipment can be used to generate a plurality of NIR images of a target. The images can be converted into frequency space, combined using chosen weighting factors, and deconvoluted into the spatial domain to provide a composite image. The composite image can have enhanced quality relative to the individual images, allowing for a richer set of information to be displayed. Other aspects such as scanning, background illumination correction, the use of filters, and additional techniques are also discussed.
Abstract:
A field effect transistor has a shifted gate such that the gate-source distance depends on the ratio of the threshold voltage to the drain voltage. In one embodiment, a switch may include two FETs: one FET in a series configuration and one FET in a shunt configuration. Providing a switch having at least one FET with a shifted gate allows increasing switching speed and decreasing insertion loss.