Search results for Physical+sciences+%3e+Semiconductor

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Analog-to-digital converter (ADC) technologies
Background Dr. Nan Sun and his research group have developed a portfolio of analog to digital converter (ADC) technologies that are available for licensing. Overall, Dr. Sun’s lab develops high-performance analog/mixed-signal circuits and architectures, with research efforts focusing primarily on designing low-power, high-speed, and high-resolution...
Low-power SAR ADC design
Background A successive approximation analog-to-digital converter (ADC) is used to digitize the physical analog signals to logic digital signals. It often requires low noise to achieve high accuracy. Traditionally the low noise is realized by utilizing a large comparator or averaging. Those methods are not desirable, since a large comparator is power-hungry...
Optical terahertz frequency comb generation using nonlinear frequency mixing in quantum cascade lasers
Background Optical frequency combs (FCs) find numerous applications in time metrology, absolute distance measurements at long range, and spectroscopy. FC spectroscopy is particularly appealing in the terahertz (THz) spectral range where THz detectors based on direct power detection have low sensitivity, slow response time, and may require cryogenic...
Fabrication of metal-insulator-semiconductor photoelectrodes
Background Photoelectrochemical (PEC) water splitting is a promising technology for converting solar energy into clean and storable chemical energy. In PEC cells, semiconductors play a key role in absorbing photons from the light source to create mobile charge carriers. Various semiconductor materials have been studied for the high-performance PEC cells,...
Variable gain amplifier utilizing positive feedback and time-domain calibration
BackgroundIn discrete-time systems, including ADCs, a voltage amplifier is necessary to increase the signal swing for further processing. Traditional precision amplification techniques, including closed-loop amplifiers, become less viable in nanometer-scale processes due to reduced transistor intrinsic gain. Additionally, these devices generally consume...
Vertical III-V nanowire FETs using nanosphere lithography
BackgroundComplementary metal-oxide-semiconductor (CMOS) devices are being scaled down aggressively in each technology generation to achieve higher integration density. However, the scaling of CMOS devices is approaching its physical limitations. For example, one significant factor limiting CMOS scaling is off-state power consumption. Within digital...
Simple printing process for quantum dot LEDs
Technology descriptionSilicon-based light sources are a promising new path towards integrated, compact, and industrially scalable microsystems for advanced computing, networking, and sensing. However, current methods for producing these next-generation lights are lacking. These techniques are often expensive, since they require high temperature, and/or...
Through silicon vias (TSV)
Through silicon vias (TSV) is a key enabling element the provides short vertical interconnects in die stacks to improve electrical performance, power consumption, and form factor for 3D integrated devices. The mismatch of thermal expansion coefficients between the copper via and the silicon wafer can induce significant thermal stresses to degrade the...
Multiple-input power converters
BackgroundPrevious technologies are using either multiple power converters or multiple-input power converters as interfaces among sources and load. The utilization of multiple power converters generally required higher cost than multiple-input power converter. Two techniques to handle multiple-input power conversion are: soft-switching power converters,...
Floating inverter pre-amplifier based dynamic comparator
Background Two technologies are touched upon. First is an energy-efficient comparator, followed by a time domain two-step capacitance-to-digital converter. Comparators bridge the analog and digital world. A low-power, low-noise comparator is critical for analog-to-digital converters. A comparator consists of a pre-amp followed by a latch. Dynamic comparators,...

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