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Power amplifier having stack structure
A power amplifier having a stack structure, including: a first driver stage that receives a power voltage from a power supply and receives and amplifies an...
There is provided a high-frequency amplifier including a divider, a plurality of amplifiers for amplifying a high-frequency signal distributed by the divider...
RF/microwave high power switching combiner unit
A switching combiner unit (SCU) may combine coherent RF or microwave outputs from multiple power amplifier units (PAUs). Each SCU may be able to be switched...
Audio amplifier mode transition
An audio amplifier is to transition between a power-down mode and an active mode, based on assertion and deassertion of a power down signal. A power down...
Method and apparatus of an input resistance of a passive mixer to broaden
the input matching bandwidth of a...
A cascode amplifier circuit comprises a first spiral inductor coupled to a source of a first transistor; a second spiral inductor coupled to a drain of a second...
Electronic system and auto configuration method for an operational
amplifier in the electronic system
The invention provides an auto configuration method for an operational amplifier in an electronic system. The method includes steps of estimating an internal...
Radio frequency power amplifier
A radio frequency power amplifier comprises an input and output terminals, a main and peak amplifier stages, and an output power combiner for combining a main...
Transmitting amplifier and transmitter
The present invention is applied to a transmitting amplifier including one of a carrier amplifier and a peak amplifier as a first amplifier and the other as a...
Three-way sequential power amplifier system for wideband RF signal
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...
Systems and methods for dynamic range enhancement using an open-loop
modulator in parallel with a closed-loop...
An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator...
Dynamic error vector magnitude duty cycle correction
Aspects of this disclosure relate to dynamic error vector magnitude (DEVM) compensation. In one embodiment, an apparatus includes an amplifier, a low pass...
Power amplifier with termination circuit and resonant circuit
Aspects of this disclosure relate to efficient power amplifiers, such as class-F power amplifiers. A power amplifier transistor can provide an amplified RF...
An amplifying device includes: a signal splitter configured to split an input signal to a plurality of signals having a phase difference between the plurality...
One example discloses a class-D amplifier apparatus, comprising: an amplifier circuit, having a set of input terminals, a set of output terminals, a quiescent...
Balanced up-conversion mixer
A balanced up-conversion mixer includes: a negative resistance compensation circuit generating and outputting first and second currents based on a DC bias...
Quantum interference device, atomic oscillator, electronic device, and
An atomic oscillator includes an atom cell, a first light source device, a second light source device, and a reception section. The atom cell is filled with...
Oscillator, electronic apparatus, and moving object
An oscillator includes a first VCXO and a second VCXO which are capable of changing an output frequency by application of a control voltage, and a control...
Apparatuses and methods for providing oscillation signals
Apparatuses and methods are disclosed for oscillators that are substantially insensitive to supply voltage variations. In one such example apparatus, a...
A semiconductor device is formed by sealing, with a resin, a semiconductor chip (CP1) having an oscillation circuit utilizing a reference resistor. The...
Infrastructure-grade integrated voltage controlled oscillator (VCO) with
linear tuning characteristics and low...
The described devices, systems and methods include a voltage controlled oscillator. The voltage controlled oscillator includes a fine-tuning varactor network, a...
Solar panel unit
A solar panel unit (10) includes a control unit (73) which operates an actuator (41) such that an angle of a solar panel (20) coincides with a predetermined...
Solar panel support
A solar panel support comprising an upper coupling member including a hollow sleeve having a tapered inner surface increasing in diameter or cross-sectional...
Geared motor unit having function for limiting thrust load
A compact geared motor unit, capable of properly protecting an electric motor without disengaging gears or suspending the unit, even when a thrust force larger...
Motor drive voltage control device and method for controlling motor drive
To suppress a decline in the control accuracy of an applied voltage associated with an increase in quantum noise, and to increase the control accuracy of a...
Dynamic inductor system
A dynamic inductor system capable of storing usable electrical energy includes a rotor, a stator, a three-phase winding set, and a damping circuit. The damping...
Motor driving method, motor driving device, and hard disk device
The present invention is intended to reduce noise and vibration of a motor. A first duty correction circuit generates a first corrected duty instruction value...
Apparatus and method for minimizing influence of temperature change in
An apparatus for minimizing an influence of a temperature change may include a motor, a temperature sensor for sensing a temperature of the motor to create the...
Method and apparatus for controlling of 3-phase AC motor
A method for controlling a 3-phase AC motor may include; transforming a torque command signal of an upper control into a voltage command, generating a current...
System and method for monitoring a rapid de-excitation system for
A system and method for monitoring a rapid de-excitation system for synchronous machines with indirect excitation, via an exciter machine and a rotating...
System and method for controlling a power generation system connected to a
A method for controlling a power generation system connected to a weak grid may generally include operating a power converter of the system so as to produce...
Plasma and induction heating power supply systems and related methods
In some aspects, a power supply system for a plasma application and/or an induction heating system includes at least two controllable power generators of...
Control device and stepping motor control method
A motor control device includes a drive unit configured to rotate a rotor by supplying a drive signal with periodical changes to a coil; a detection unit...
Motor driving circuit
A logic circuit controls a bridge circuit connected to a coil of a stepping motor in synchronization with an input pulse, so as to control electric power...
Image forming apparatus
An image forming apparatus drives and rotates at least one of a photosensitive drum and a transport roller with use of a stepping motor in a multi-phase...
Image forming apparatus, motor control apparatus, and method of
An image forming apparatus includes an engine portion configured to perform image forming, a direct current (DC) motor configured to mechanically operate the...
Remotely-programmable control circuit for single-phase motor
An HVAC control system, associated brushless direct current motor, and methods of operation are disclosed. One such control system includes a brushless direct...
Driving device of multi-phase motor, driving method, cooling device, and
A driving device of a multi-phase motor having a plurality of coils is provided. The driving device includes a back electromotive force (BEMF) detecting...
Apparatus for driving motor and controlling method thereof
There is provided an apparatus for driving a motor including: a converter applying an input voltage to each phase winding of the motor; and a processor...
Systems and methods for controlling motor torque output
Systems and methods are disclosed for controlling a torque output by an AC motor drawing power from a DC bus. According to certain embodiments, the system for...
Engine control for a synchronous motor
The invention relates to an engine control for a synchronous motor having a number of N stator coils set off in regard to each other, which are arranged around...
Motor driving device and air conditioner including the same
A motor driving device and an air conditioner including the same are disclosed. The disclosed motor driving device includes a rectifier to rectify input AC...
A micro-hydraulic device includes an enclosure. The enclosure includes a substrate having a first surface and a second surface distal to the first surface. The...
Method and apparatus for sensing signals
Methods, apparatuses, and systems are disclosed for a transducer. The transducer can include a bottom plate formed from a first sheet of material, a top plate...
Diode substitute with low drop and minimal loading
A voltage rectifier circuit having a storage element and a switching stage that is switchable to enable the storage element to capture a peak voltage of an...
Hybrid converter and wind power generating system
The present invention discloses a hybrid converter and a wind power generating system, the hybrid converter including a voltage source converter, a line...
Electric power feedback apparatus with main power output-feedback and
standby power output-feedback
An electric power feedback apparatus is electrically connected to a power supply apparatus. The power supply apparatus includes a power supply module, a main...
Energy storage device, system with energy storage device and method for
generating a supply voltage of an...
The invention relates to an energy storage device for generating an n-phase supply voltage for an electrical machine, where n.gtoreq.1, or for an inverter, with...
Circuit and method for managing common mode noise in isolated resonant
DC-DC power converters
A resonant DC/DC power converter is provided with isolated primary and secondary circuits. The primary circuit includes at least four switches as first and...
Voltage conversion device
A voltage conversion device includes a voltage conversion unit and a control unit. The voltage conversion unit includes an input rectifier circuit, a storage...
Transformer communication system
A switched mode power converter (SMPC) has an isolation transformer for power transfer and a communication circuit for data communication between the primary...