Abstract: A system for split-frequency amplification, preferably including: one or more primary-band amplification stages, one or more secondary-band amplification stages, one or more band-splitting filters, and/or one or more signal couplers. An analog canceller including one or more split-frequency amplifiers. A mixer including one or more split-frequency amplifiers. A voltage-controlled oscillator including one or more split-frequency amplifiers. A method for split-frequency amplification, preferably including: receiving an input signal, separating the input signal into signal portions, and/or amplifying the signal portions, and optionally including combining the amplified signal portions and/or providing one or more output signals.

Abstract: An adjusting power measuring apparatus includes: a processor that: acquires an active power measurement value of active power exchanged at a connection point between a targeted power grid and an adjusting power supply source that supplies adjusting power to the targeted power grid, acquires a frequency measurement value of frequency at the connection point, calculates, based on the active power measurement value and the frequency measurement value, a first adjusting power coefficient indicating a degree of influence that fluctuation in the active power has on fluctuation in the frequency, calculates, based on the first adjusting power coefficient and a fluctuation measurement value of the fluctuation in the frequency, the adjusting power supplied from the adjusting power supply source to the targeted power grid, and determines, based on the calculated adjusting power, compensation to be paid to an owner of the adjusting power supply source.

Abstract: An electronic circuit includes a first pin corresponding to a reference signal and a second pin corresponding to an external resistor, the external resistor being connected on a first side to the second pin and connected on a second side to ground. The apparatus also includes a first oscillator having a first frequency loop configured to: receive, via the first pin, the reference signal; receive, via the second pin, a current associated with voltage applied to the external resistor; and lock a first frequency output at a frequency associated with the reference signal. The apparatus also includes a second oscillator having a second frequency loop configured to: receive the first frequency output; scale the frequency of the first frequency output; and lock a second frequency output at the scaled frequency of the first frequency output.

Abstract: In described examples, an apparatus includes: at least one resonant circuit for receiving a radio frequency signal; a rectifier coupled to the resonant circuit to output a first rectified signal with a constant level portion and a portion matching a first portion of the radio frequency signal, and to output a second rectified signal having a constant level portion and a portion that matches a second portion of the radio frequency signal; a first limiter circuit to limit a voltage of the first rectified signal to a predetermined maximum voltage level; a second limiter circuit to limit the voltage of the second rectified signal to the predetermined maximum voltage level; a third limiter circuit to limit a voltage of the first rectified signal to a predetermined minimum voltage level; and a fourth limiter circuit to limit the voltage of the second rectified signal to the predetermined minimum voltage level.

Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.

Abstract: An electromagnetic energy harvester circuit to obtain unrealized potential energy employs an E-I inductor having a primary coil winding and a secondary coil winding. A capacitor is electrically coupled to a main power source and upper lead to the primary coil winding, wherein a lower lead of the primary coil winding is coupled to a primary AC load. The secondary coil winding has an upper lead coupled to a first input of a secondary load and a lower lead coupled to a second input of the secondary load. The circuit harvester's electrical current produced through the windings to allow operation of the secondary load.

Abstract: Wireless charging methods and systems are provided for detecting foreign material by measuring a Q-factor based on a predefined packet and a transmission sequence while a wireless charging transmission device transmits power. An electronic device includes a battery; a coil; a wireless charging reception circuit; a power management module configured to control a charging state of the battery using a voltage supplied from the wireless charging reception circuit; and a processor configured to receive power from a wireless charging transmission device through the coil, determine whether a predetermined condition is satisfied while the battery is charged using the received power, and transmit a foreign material detection request packet to the wireless charging transmission device in response to determining that the predetermined condition is satisfied.

Abstract: Methods and systems for a complementary metal oxide semiconductor wireless power receiver may include a receiver chip with an inductor, a configurable capacitance, and a rectifier. The method may include receiving an RF signal utilizing the inductor, extracting a clock signal from the received RF signal, generating a DC voltage utilizing a rectifier circuit, sampling the DC voltage, and adjusting the configurable capacitance based on the sampled DC voltage. The rectifier circuit may include CMOS transistors and T-gate switches for coupling to the inductor. The T-gate switches may be controlled by the generated DC voltage. A signed based gradient-descent algorithm may be utilized to maximize the DC voltage. The DC voltage may be sampled utilizing a comparator powered by the DC voltage, which may adaptively configure the capacitance. The inductor may be shielded utilizing a floating shield. The DC voltage may be increased utilizing a voltage-boosting rectifier.

Abstract: An LC oscillator capable of temperature compensation includes a differential voltage supplier providing a positive differential voltage to a positive node and a negative differential voltage to a negative node and a differential oscillation frequency signal output unit outputting a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier.

Abstract: A soft-switching solid-state power transformer, including: a high-frequency (HF) transformer comprising first and second winding connections; a first auxiliary resonant circuit coupled to the first winding connection, the first auxiliary resonant circuit comprising: a resonant capacitor coupled across the first winding connection, a resonant inductor coupled across the first winding connection in parallel with the resonant capacitor, and a damping feature coupled across the first winding connection in series with the resonant capacitor and the resonant inductor; a first current-source inverter (CSI) bridge coupled to the first auxiliary resonant circuit, the first CSI bridge comprising reverse blocking switches configured to conduct current in one direction and block voltage in both directions; a second auxiliary resonant circuit coupled to the second winding connection; and a second CSI bridge coupled to the second auxiliary resonant circuit, the second CSI bridge comprising reverse blocking switches.

Abstract: This specification describes a power distribution system comprising a first section that receives power from a first source. The power at the first section is adjusted by a rectifier coupled to a power bus of the first section. The system includes a second section that is separate from the first section and that receives power from a second source. The power at the second section is adjusted by a rectifier coupled to a power bus of the second distribution section. The system includes a swing rectifier connected to each of the first and second sections. The swing rectifier is configured to provide power to the first power bus and to the second power bus and to dynamically adjust the power capacity of the first section that is available to computing loads, and to dynamically adjust the power capacity of the second section that is available to computing loads.

Abstract: Methods and systems for reducing phase noise in a voltage controlled oscillator (VCO) are described. In an example, a first transistor, a second transistor, a third transistor, and a fourth transistor, can be provided. A transformer can be used to decouple drain terminals and gate terminals of the first, second, third, and fourth transistors. An oscillation amplitude of the VCO can be increased by providing a first bias voltage to the transformer to adjust gate bias voltages of the first and second transistors. The oscillation amplitude of the VCO can also be increased by providing a second bias voltage to the transformer to adjust gate bias voltages of the third and the fourth transistors.

Abstract: A filtering circuit for filtering a pulse width modulated (PWM) signal includes a D flip-flop having an input terminal configured to be coupled to a logic high signal and having an output terminal coupled to an output terminal of the filtering circuit; and a circuit coupled between an input terminal of the filtering circuit and the D flip-flop, the circuit configured to, for a first pulse of the PWM signal having a duty cycle within a pre-determined range: generate a positive pulse at a clock terminal of the D flip-flop as a clock signal of the D flip-flop; and generate a negative pulse at a reset terminal of the D flip-flop as a reset signal of the D flip-flop, wherein a duration between a rising edge of the positive pulse and a falling edge of the negative pulse is equal to a duration of the first pulse of the PWM signal.

Abstract: Various embodiments may provide a transmitter device. The transmitter device may include an oscillator configured to operate at a variable oscillation frequency to generate an oscillator signal. The transmitter device may also include a transmitter antenna configured to transmit power to a receiver device via magnetic coupling based on the oscillator signal. The transmitter device may further include a feedback arrangement configured to generate a feedback to the oscillator based on a resonant frequency of the magnetic coupling between the transmitter antenna and a receiver antenna of the receiver device such that the variable oscillation frequency of the oscillator is adjusted towards the resonant frequency.

Abstract: A system and method for calibrating a pulse width modulation (PWM) signal that extends the on time by a higher resolution increment. The system comprises a PWM generator that receives a VDDIO rail to generate first and second PWM signals, the second PWM signal having an on time extended by the higher resolution increment having a commanded length. The system further comprises a VDDIO circuit that receives the VDDIO rail and outputs a VDDIO signal. First and second analog-to-digital converters are configured to generate a first and second sets of PWM samples and first and second sets of VDDIO samples. A microcontroller is configured to calculate an actual increment length based on the samples, and to compensate for a difference between the commanded length and the actual increment length.

Abstract: An apparatus for coupling power systems, in particular a DC system, for example a motor vehicle electrical system, with a single-phase AC system or a further DC system, the apparatus including a non-inverting DC-DC converter and an inverting DC-DC converter, each having a first input and/or output and a second input and/or output, the first input and/or output of the first DC-DC converter being connected in series to a first converter valve to form a first series circuit, and the first input and/or output of the second DC-DC converter being connected in series to a second converter valve to form a second series circuit, the first and second series circuits being connected in parallel, and the second inputs and/or outputs of the DC-DC converters being connected in parallel and the terminals of the parallel circuit of the series circuits being connected to a first input and/or output of the apparatus.

Abstract: A control device for controlling a power source connected to an alternating-current (AC) power system includes: a frequency control unit that controls a frequency of the power source operating in a constant-voltage constant-frequency control scheme; a power calculation unit that calculates, when the frequency control unit varies a frequency of the power source, a variation of an effective power output from the power source; an arithmetic unit that calculates a frequency characteristics constant of the AC power system, based on a variation of the frequency of the power source and the variation of the effective power output from the power source; and a selection unit that selects a control scheme for the power source, based on the frequency characteristics constant of the AC power system.

Abstract: A temperature-controlled and temperature-compensated oscillating device and a method of temperature control and temperature compensation is disclosed. The operating temperature of a frequency source is adjusted by driving a heater to a target temperature when the ambient temperature is in a first range between a first temperature and a second temperature higher than the third temperature. The frequency variation of the frequency source resulted from a variation of the ambient temperature is reduced by applying a voltage to the frequency source when the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature. The third temperature is higher than the first temperature.

Abstract: An oscillator circuit includes a core stage having a voltage controlled oscillator arranged to output an output oscillation signal, and an input stage coupled to the output stage via an induction coupling, and arranged to receive an input oscillation signal; wherein the output oscillation signal includes an output oscillation frequency substantially equals to a multiplication of an input oscillation frequency of the input oscillation signal.

Abstract: A tunable oscillator includes a current bias circuit configured to generate a reference bias current, a variable voltage bias circuit configured to receive the reference bias current and generate a bias voltage varied based on a voltage control signal, an oscillation signal generator circuit configured to generate an oscillation signal based on the reference bias current and a switching control signal, and a switching control circuit configured to generate the switching control signal based on the bias voltage and the oscillation signal. A frequency of the oscillation signal is varied based on a magnitude of the bias voltage.