Abstract: A semiconductor device includes a layered structure forming multiple carrier channels including at least one n-type channel formed in a first layer made of a first material and at least one p-type channel formed in a second layer made of a second material and a set of electrodes for providing and controlling carrier charge in the carrier channels. The first material is different than the second material, and the first and the second materials are selected such that the n-type channel and the p-type channel have comparable switching frequency and current capability.

Abstract: A three-way sequential power amplifier includes an input network connected to a main amplifier, a first peak amplifier, a second peak amplifier, which in turn are connected to a three-way output network. An input signal for an input port of the input network is a wideband radio frequency (RF) signal with a time varying amplitude. An output port of the output network can be connected to an antenna, via a bandpass filter, to attenuate out of band frequencies.

Abstract: A sensor includes a source including an electromagnetic structure generating an electromagnetic near-filed upon receiving energy and a detecting unit including at least one coil arranged in proximity to the source such that the electromagnetic near-filed induces, via an inductive coupling, a current passing through the coil. The sensor also includes a measuring unit for measuring a voltage across the coil and a processor for detecting a presence of a target structure in proximity to the source upon detecting a change in a value of the voltage. The target structure is an electromagnetic structure moving at a distance from the source.

Abstract: A system exchanges energy wirelessly and includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves. The structure is non-radiative, and generates an electromagnetic (EM) near-field in response to receiving the energy. A negative index material (NIM) is arranged within the EM near-field such that the coupling is enhanced.

Abstract: A semiconductor device includes a layered structure forming multiple carrier channels extending in parallel at different depths of the semiconductor device and a gate electrode having multiple gate fingers of different lengths penetrating the layered structure to reach and control corresponding carrier channels at the different depths. The semiconductor device also includes a carrier electrode having multiple carrier fingers of different lengths penetrating the layered structure to access the corresponding carrier channels. The carrier fingers are interdigitated with the gate fingers.

Abstract: A three-way sequential power amplifier includes an input network connected to a main amplifier, a first peak amplifier, a second peak amplifier, which in turn are connected to a three-way output network. An input signal for an input port of the input network is a wideband radio frequency (RF) signal with a time varying amplitude. An output port of the output network can be connected to an antenna, via a bandpass filter, to attenuate out of band frequencies.

Abstract: A method controls power generated by a photovoltaic array. The method estimates a voltage corresponding to a global maximum power point (MPP) of the power generated by the photovoltaic array to produce an estimated voltage; and tracks an output of the power based on the estimated voltage to determine the global MPP.

Abstract: A power encoder includes a pulse width modulator for modulating a signal according to a set of thresholds to produce a pulse width modulated (PWM) signal and a switch mode power amplifier for amplifying the PWM signal by switching states of switching devices according to amplitudes of the PWM signal. At least one or combination of a distribution of values of the voltage thresholds in the set and a distribution of values of a current generated by different switching devices are non-uniform. The set of voltage thresholds includes at least two positive voltage thresholds.

Abstract: A transceiver has a first antenna and a second antenna for transmitting alternatively a frequency-hopped sounding reference signal (SRS) over a sub-band of a bandwidth at a time. The transceiver includes a determination unit for determining whether a number of sub-bands in the bandwidth is odd or even, a transmitter for transmitting the SRS continuously from the first antenna, if the number of sub-bands is even, and a receiver for receiving a response to the transmitting.

Abstract: A method generates space vector modulation signals for a multi-level power inverter using space vector pulse width modulation (SVPWM). A reference voltage and a triangle region for the reference voltage are determined. Vertices for a space vector that is closest to the reference voltage is outputted. Then, the vertices are adjusted so that the space vector is in a valid region of the triangle region. Lastly, the space vector modulation signals a, b, and c corresponding to the space vector in the valid region are outputed.

Abstract: A wideband self-envelope tracking power amplifier (PA) can use more than a 40-MHz channel bandwidth and improves the envelope bandwidth limit of a self-envelope tracking PAs by ten times. The PA uses an envelope load network, which is based on a general multi-stage low-pass filter. The envelope load network located between an RF choke inductor and main DC power supply provides a dynamically modulated PA supply voltage without using a dedicated envelope amplifier. An input terminal of the network connects a main PA via an RF choke inductor to an input of low-pass filter. An output terminal is connected to the low-pass filter via an envelope choke inductor and to a direct current (DC) power supply. A DC blocker is connected between the output of the low-pass filter and ground by a termination resistor.

Abstract: A method for generating a multi-band signal transforms multiple base-band envelope signals into a sequence of symbols representing a signal including a plurality of disjoint frequency bands. Each frequency band corresponds to a single base-band envelope signal. Each symbol corresponds to amplitude of the signal and is a number selected from a finite set of numbers. The method encodes the sequence of symbols as a plurality of pulse width modulation (PWM) signals. Each PWM signal includes a plurality of codes for encoding each symbol, such that a sum of values of the codes of the set of PWM signals encoding a symbol is proportional to a value of the symbol. The method amplifies the PWM signals to produce a plurality of amplified signals and combines the amplified signals to produce the multi-band signal.

Abstract: A method determines a type of an object in a proximity to a resonant structure having a resonant frequency as a metallic object if the object changes a phase of a power signal reflected by the resonant structure at frequencies below and above the resonant frequency. Otherwise, the method determines the type of the object as a non-metallic object.

Abstract: A power encoder includes a pulse width modulator for modulating a signal according to a set of thresholds to produce a pulse width modulated (PWM) signal and a switch mode power amplifier for amplifying the PWM signal by switching states of switching devices according to amplitudes of the PWM signal. At least one or combination of a distribution of values of the voltage thresholds in the set and a distribution of values of a current generated by different switching devices are non-uniform. The set of voltage thresholds includes at least two positive voltage thresholds.

Abstract: A power encoder includes a pulse width modulator for modulating a signal according to a set of thresholds to produce a pulse width modulated (PWM) signal and a switch mode power amplifier for amplifying the PWM signal by switching states of switching devices according to amplitudes of the PWM signal. At least one or combination of a distribution of values of the voltage thresholds in the set and a distribution of values of a current generated by different switching devices are non-uniform. The set of voltage thresholds includes at least two positive voltage thresholds.

Abstract: A system includes a first resonator coupled to an energy source and a second resonator located a distance from the first resonator and coupled to the first resonator to provide near-field wireless energy transfer between the first resonator and the second resonator. The first resonator and the second resonator are non-radiative structures having a resonant frequency. The system also includes an artificial magnetic conductor (AMC) having the resonant frequency and arranged within the system to shape the near-field of at least one of the first resonator and the second resonator. The AMC includes a layer of unit cells arranged in a periodic pattern enabling the AMC to reflect the near-field. Each unit cell of the AMC includes a plurality of electronic components.

Abstract: A wideband harmonic trap includes a first resonant tank in the form of a parallel LC circuit, and a second resonant tank in the form of a series LC circuit. The LC circuits are connected to a common input, an output of the parallel LC circuit is connected to a load and to ground via a shunt capacitor, and an output of the series LC circuit is connected to the ground.

Abstract: A wideband harmonic trap includes a first resonant tank in the form of a parallel LC circuit, and a second resonant tank in the form of a series LC circuit. The LC circuits are connected to it common input, an output of the parallel LC circuit is connected to a load and to ground via a shunt capacitor, and an output of the series LC circuit is connected to the ground.

Abstract: Packets in a multi-hop wireless network are routed based on the available link throughputs, network node congestion and the connectivity of the network in a manner that minimizes the use of radio resources and minimizes delay for packets in multi-hop system. The routing method also avoids congestion in the access network, especially near the network access points as provided by network access nodes. Each wireless network node maintains a link table for storing link conditions and associated route costs. Packets are routed according to the low cost route. Subsequent wireless network nodes evaluate whether a lower cost route is available and, if so, route the data packet according to the lower cost route. Every wireless network node transmits the data packet, a specified route and a time stamp indicated a time of the last data entry in the link table that was used to calculate the low cost route.

Abstract: A transmitter includes a first digital up-converter for converting data to an intermediate frequency (IF) signal, a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train, a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train, a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train.