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(SD2020-249) Adaptive Bias Circuits For CMOS Millimeter-Wave Power Amplifiers: state-of-the-art back-off efficiency for silicon Ka-band Doherty PAs using single inputs and without digital predistortion

Power amplifier performance for emerging 5G mm-wave systems poses significant challenges for output power, efficiency and linearity. Efficiency in backoff is a key concern, given the peak-to-average power ratio of order 6-9dB for 5G signals. As a result, considerable attention has been given to composite amplifiers featuring backoff efficiency enhancement, particularly Doherty amplifiers. Adaptive bias circuits have been previously developed for use with power amplifiers at low microwave frequencies (for example, 1-2GHz as applied in 2G, 3G and 4G cellular networks).  Direct application of these techniques is not straightforward at higher frequencies, such as 28GHz as used for 5G wireless communications, because the transistors have less gain at the high frequencies. 

Scalable High Intensity Ultrashort Pulse Compressor And Cleaner

This invention is a high intensity ultrashort pulse compressor that filters out low intensity artifacts and is made with commercially available low-cost components. This integrated system also provides scalability and can therefore be used for a range of laser intensities.

A Battery-Less Wirelessly Powered Frequency-Swept Spectroscopy Sensor

UCLA researchers in the Department of Electrical and Computer Engineering have developed a wirelessly powered frequency-swept spectroscopy sensor.

Scalable Manufacturing of Copper Nanocomposites with Tunable Properties

UCLA researchers in the Department of Mechanical and Aerospace Engineering have developed a cost-effective method to produce copper-based nanocomposites with excellent mechanical, electrical and thermal properties.

A Family Of Hybrid Boosting Voltage Converters

Many industries, such as solar cells and energy storage, will be greatly benefited by high-gain step-up/step-down converters.UCI researchers have developed a family of hybrid boosting converters (HBC) that combine a base bipolar voltage multiplier (BVM) and one of several possible inductive switching cores to address various converter functionalities.

A Family Of Two-Switch Boosting Switched-Capacitor Converters (TBSC)

Switched capacitor converters, which provide high-gain voltage conversion, have drawbacks that have limited their use to specific applications. UCI researchers have developed a family of two-switch boosting switched-capacitor converters (TBSC) that enables the use of switched-capacitor converters in low cost and small-size applications as well as on-chip integration.

Combination Of Air Lubrication And Super Hydrophobic Frictional Drag Reduction

This technology combines air layer frictional drag reduction (ALDR) with super hydrophobic surfaces (SHS) to achieve frictional drag reduction of ALDR with significantly reduced gas flux. Thus, enabling increased net energy savings. The stable air layer is achieved with lesser gas flux when utilizing a SHS.Periodic air layers may replenish SHS, enabling drag reduction with reduced energy cost. Combinations of SHS and regular or other non-SHS surface may be used to control spreading of gas, thus facilitating formation of ALDR using discrete gas injection points better than previously achievable. Such surface variations could also be used to preferentially guide gas towards or away from propulsion, depending on desired outcome. By controlling ALDR regionally or globally on a surface, with or without SHS, this technology modifies flow around a hull. This mediates forces on partially or fully submerged objects, enabling control of flow patterns, resistance, steering, and/or dynamics.

Half-Virtual-Half-Physical Microactuator

Researchers at the University of California, Davis have developed a half-virtual-half-physical microactuator that utilizes a combination of computational models and microelectromechanical systems for use in medical devices and mechanical systems.

Method Of Localizing Breakdown In High Power Rf Network

Researchers in the Department of Physics have developed a method for detecting localized electrical breakdowns in high power RF networks.

Clock Power Reduction Utilizing Adiabatic Charging Method Via a Switched-Capacitor Circuit

Normally, charging a capacitive load from a voltage source invokes a ½ CV2 energy penalty. The concept of adiabatic charging, where the capacitor is charged more slowly than nominally afforded by the natural RC time constant of the charging circuit in the pursuit of reducing energy dissipation to below ½ CV2, has been around for decades. However, there has not been any solution to enabling this slow charging phenomenon in a practical, low-overhead embodiment. For example, prior work used separate DC-DC converters to provide multiple voltage levels, or used resonant inductors, both of which invoke significant area overhead.

A CMOS Compatible Fully-Integrated Switched-Domain Power Inverter Circuit

Modern mobile applications strive for the complete integration of all communication systems in CMOS. Unfortunately, it is conventionally difficult to efficiently generate high levels of RF power in scaled CMOS largely due to the inherently low voltage ratings of core transistors. To realize high output power with ~1V transistors, power combining techniques have been proposed whereby the output of several low-voltage power amplifier (PA) cells are combined via inductive transformers. However, power combining relies on ultra-thick metal that still carries large ohmic and substrate losses. These AC-AC losses, combined with the DC-AC losses of the PAs themselves, and the DC-DC losses of the battery-connected power converters, result in limited total transmitter efficiencies. Even modern digital PA techniques such as RF-DACs, digital Doherty, and digital out-phasing, which have been proposed to leverage the excellent switch performance of scaled transistors and offer reconfigurable operation, still require battery-connected DC-DC converters and RF transformers/power combiners, both of which result in cascaded losses.

Operation Frequency Band Customizable and Frequency Tunable Filters with EBG substrate

The technology relates to cavity resonators and filters for improved processing of electromagnetic signals. Specifically, the invention is a cavity resonator or filter that is constructed on electromagnetic bandgap substrate that includes an external controlling assemble can change the work frequency of the cavity resonator or filter. This enables device access to frequencies with a very broad range.

Improved Energy Harvesting for Current-Carrying Conductors

There are an estimated 130 million wooden poles that support overhead power lines in the US.  Extreme weather, aging, storms or sabotage can all lead to potential damage of these poles and power lines, which can leave large areas without basic necessities.  Due to this risk, it’s anticipated that power utility companies will deploy sensors and corresponding energy harvesters to better respond to potential damage of this critical electricity grid infrastructure. To address this anticipated mass deployment of sensors and harvesters, researchers at UC Berkeley have developed technology improvements to harvesting of electrical energy from energized conductors carrying alternating currents, such as those on overhead and underground power lines (as well as power-supplying conductors in offices and dwellings).  These enhanced harvesters would improve the economics of deploying sensors across a national power grid.  The Berkeley harvesters can readily provide enough power to supply wireless communication devices, energy storage batteries and capacitors, as well as sensors such as accelerometers, particulate matter measuring devices, and atmospheric sensors.

A Highly-Efficient Near-Field Wireless Power Transfer System That Is Immune To Distance And/Or Coupling-Coefficient Variations

UCLA researchers in the Department of Electrical Engineering have developed a novel design for a wireless power transfer system. This new design is optimized to function stably over a greater and variable distance than current systems and to function with a higher efficiency.

Signal Statistics Compression-Based Quantization Method in an ADC

The technology is a new architecture for analog-to-digital converters (ADCs).Its properties include the use of unique signal statistics compression quantization technique, lower power than other ADC techniques, no degradation of effective number of bits and conversion rate, and automatic adaption to power-optimized state of input signal.With this technology, users will be able to produce more power efficient ADCs

Methods for Fabrication of Electric Propulsion Tips

The technology is a method for fabrication of silicon microfabricated emitter tips.This process has two-step etching process which utilizes field emission electric propulsion (FEEP) and indium propellant.

Thermal Devices for Controlling Heat Transfer

The technology is a heat transfer device. The key properties are a unidirectional heat flow, thin, sandwich structure, and a T-dependent thermal resistance. The technology functions via the heat pipe effect. The purpose of the technology is to provide a one-way heat flow in a compact form (in a thin layer) with T-dependent thermal resistance.

Silicon On Sapphire Based Plasmonic And Metasuraface Design For Optical Light Manipulation

The technology is a high contrast optical grating.It features patterned silicon on sapphire and is designed for a broad range of optical frequencies: from visible to far infrared with ultra-high reflectivity.The technology can be tailored to mimic mirrors and other optical components.

GaN-based Vertical Metal Oxide Semiconductor and Junction Field Effect Transistors

The first true vertical GaN-based transistors, where gating is also performed on electrons traveling perpendicular to the surface in a vertical channel.

A Robust Hybrid Control Algorithm for a Single-Phase DC/AC Inverter

Future energy distribution systems must be capable of interconnecting highly variable sources of electricity into the existing grid. The development of “Smart Grid” is needed due to increasing electricity demands and the need regulate input power sources. A particular challenge already impacting deployment of diverse renewable electric sources is the need to regulate the highly variable power these sources generate. While single-phase DC/AC inverters using Pulse WIdth Modulation (PWM) are one of the most common topologies used in power conversion, PWM is not robust with respect to changes in the DC input voltage. PWM also suffers from harmonic distortions that are less and less acceptable to downstream consumers of the power. One of the main shortcomings of converters controlled by PWM-based algorithms is that they are not robust to changes in the input DC voltage, which limits their use in renewable energy applications.

Microstructured Cathode for Self-Regulated Oxygen Generation and Consumption

UCLA researchers have developed a cathode that generates oxygen, consumes the oxygen as needed, and stops the oxygen generation when it is not consumed, all in a self-regulated fashion.

Method For Dynamic Intelligent Load Balancing

Brief description not available

Vertical Heterostructures for Transistors, Photodetectors, and Photovoltaic Devices

The Duan group at UCLA has developed a high current density vertical field-effect transistor (VFET) that benefits from the strengths of the incorporated layered materials yet addresses the band gap problem found in current graphene technologies.

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