Abstract: A flyback power converter includes a transformer which has a primary winding, a secondary winding, and an auxiliary winding; a power switch controlling the conduction of the primary winding; and a control circuit generating a control signal to control the power switch, wherein the control circuit is an integrated circuit having a current sensing pin for obtaining a current sensing signal of a current through the power switch. The flyback power converter further includes a temperature-sensitive resistor or a mode detection resistor coupled between the auxiliary winding and the current sensing pin. The temperature-sensitive resistor provides a temperature-related signal for the control circuit to perform an over-temperature protection, or the temperature-sensitive resistor provides a mode detection signal for the control circuit to determine an operation mode of the flyback power converter.

Abstract: A control circuit and the control method for controlling the current voltage converter of a power conversion system in the start-up phase are disclosed. A first voltage is applied to the non-inverting input terminal of the comparator and a reference voltage is applied to the inverting input terminal of the comparator. When the first voltage exceeds the reference voltage, the comparison result from the comparator triggers the frequency of the clock signal generated by the oscillator to reduce preventing the primary current flowing through the primary winding of the transformer exceeding a pre-set value.

Abstract: The present invention provides an isolated power supply circuit with a programmable function and a control method thereof. The isolated power supply circuit includes: a transformer circuit, a power switch circuit, a control circuit, and a discharge circuit. The control circuit generates an operation signal and a bleeding signal according to a setting signal. The discharge circuit is coupled to an output node, for generating a discharging current. When the programmable output voltage at the output node switches between different predetermined levels, in a transition period, the bleeding signal adjusts the discharging current to discharge the output node, such that the transition period is shortened.

Abstract: A secondary control circuit includes a voltage regulator circuit coupled to an output of the power converter to provide a regulated power supply. One or more switched loads are coupled between a first terminal and an output ground terminal. The first terminal is coupled to the output of the power converter. Each switched load is coupled to draw a respective current from a load current to clamp the output of a power converter. One or more comparator circuits are coupled to a second terminal. The second terminal is coupled to receive an output sense signal. Each comparator circuit is coupled to receive a reference signal that is a scaled representation of a first reference signal. Each switched load is switched in response to a respective comparator circuit to draw a respective current from the load current of the power converter to clamp the output of the power converter.

Abstract: A power conversion method of a power conversion device including a primary side port disposed in a primary side circuit and a secondary side port disposed in a secondary side circuit magnetically coupled to the primary side circuit with a transformer, the power conversion device adjusting transmission power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit, and changing a voltage of the secondary side port by a DC-DC converter connected to the secondary side port, the power conversion method including: monitoring a voltage ratio of a voltage of the primary side port and the voltage of the secondary side port; and causing the DC-DC converter to operate when the voltage ratio deviates from the reference value by the specified value or more.

Abstract: The present invention discloses a flyback converter, a primary side control circuit therein, and a control method thereof. The flyback converter includes: a transformer circuit, a power switch circuit, a primary side control circuit, a synchronous rectification (SR) switch, and a synchronous rectification (SR) control circuit. When a feedback signal indicates that a difference between a target output voltage and an actual output voltage increases, the primary side control circuit increases an operation frequency of an operation signal by step-wisely reducing a cycle period of the operation signal in response to the increase of the difference, wherein the cycle period of the operation signal is reduced by a predetermined unit of time in each step, such that the cycle period of the operation signal is a step function of the increase of the difference.

Abstract: A resonant converter includes a primary-side winding electrically coupled to an input voltage, a secondary-side winding electrically coupled to a load, first and second switches coupled to one end of the primary-side winding, and a switch control circuit configured to differently control switching frequency limit ratios of the first and second switches by differently limiting a frequency variation ratio of a first clock signal that determines switching frequencies of the first and second switches according to variation of one of the input voltage and the load.

Abstract: A three-level converter and a method for controlling a three-level converter, wherein the third (S31, S32, S33), the fourth (S41, S42, S43) and the fifth (S51, S52, S53) controllable semiconductor switch of a switching branch having, out of all the switching branches, the most positive voltage in its alternating current pole (AC1, AC2, AC3) is controlled to be non-conductive for the whole period of time when the switching branch in question has the most positive voltage in its alternating current pole, and the first (S11, S12, S13), the second (S21, S22, S23) and the sixth (S61, S62, S63) controllable semiconductor switch of a switching branch having, out of all the switching branches, the most negative voltage in its alternating current pole is controlled to be non-conductive for the whole period of time when the switching branch in question has the most negative voltage in its alternating current pole.

Abstract: A non-isolated symmetric self-coupling 18-pulse rectifier power supply system comprises a phase-shifting autotransformer, three circuits of output devices, a time sequence controller and a power output end. The phase-shifting autotransformer is provided with three groups of output ends and one group of input ends, and the output device in each circuit comprises a zero-sequence suppression reversing inductor, a three-phase uncontrolled rectifier bridge and a bidirectional switch BUCK converter, which are connected to each other in turn. The time sequence controller is provided with three groups of control ends which are respectively connected to the control end of the bidirectional switch BUCK converter in each circuit. The output end of the bidirectional switch buck converter in each circuit is connected to the power output end.

Abstract: This relates to a rectifier with indicator switch circuit that may be used in a power conversion system. The rectifier with indicator switch circuit may be configured to rectify an ac line voltage and output an indicator signal that is representative of a fault condition in the ac line voltage. The rectifier with indicator switch circuit may include a storage capacitor configured to be charged by the ac line voltage during a first half-cycle of the ac line voltage and a detection capacitor configured to be charged by the storage capacitor during a second half-cycle of the ac line voltage. A switch coupled to the detection capacitor may be configured to generate the indicator signal based on a voltage across the detection capacitor. The indicator signal may be provided to a controller to disable operation of the power conversion system in response to the detection of a fault condition.

Abstract: In one embodiment, a controlling circuit configured for an AC/DC converter that receives an AC voltage supply, can include: (i) a compensation signal generator configured to generate a compensation signal that follows an error between an output signal from the AC/DC converter and an expected converter output signal during a first time interval of a half period of the AC voltage supply, the compensation signal being substantially constant during a remaining time interval of the half period; and (ii) a controlling signal generator configured to generate a controlling signal based on the compensation signal to maintain the output signal as substantially consistent with the expected converter output signal.

Abstract: An AC-DC conversion circuit is disclosed. The AC-DC conversion circuit has an inputting module, a rectifying module, a transforming module, an outputting module, a voltage detecting module, and a controlling module. The voltage detecting module is used to detect the DC voltage outputted from the rectifying module, the controlling module is used to control whether the AC-DC conversion circuit works or not according to a detecting result of the voltage detecting module. This prevents damage of the AC-DC conversion circuit and unstable output voltage by disposing the voltage detecting module and the controlling module.

Abstract: Cascade H-Bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control THD and to mitigate power distribution imbalances within multilevel inverter elements using either complementary carrier or complementary reference modulation techniques.

Abstract: An inverter device includes: a step-up circuit; an inverter circuit; a control unit for controlling the step-up circuit and the inverter circuit; and a reactor provided on an electric path for outputting the converted AC power to an AC system. An output current target value is calculated based on an input power value of DC power and a voltage value of the AC system, and a current target value and a voltage target value for the inverter circuit are calculated based on the output current target value, to control the inverter circuit. A current target value for the step-up circuit is calculated based on a current target value and a voltage target value that are common with the inverter circuit, and on a DC input voltage value, to control the step-up circuit. Thereby, output of the AC power is controlled.

Abstract: A present invention provides a device capable of controlling a variable stiffness mechanism, which has a dielectric elastomer interposed between two members, so as to suppress an increase in the strain of the dielectric elastomer caused by the creep phenomenon. A power source control unit 21 corrects a reference supply voltage Vbase of an output voltage of a power source 10, which is determined on the basis of a desired degree of stiffness of a dielectric elastomer 1, by a feedback manipulated variable determined on the basis of a difference between a desired value of the capacitance of the elastomer 1 and an estimated value thereof, thereby setting a desired value for controlling the output voltage of the power source 10 in order to control the power source 10 according to the desired value for control.

Abstract: A power-generating system includes a heat source which is able to produce temporal temperature variation, a first device in which polarization occurs based on the temperature change of the heat source, and a second device for taking out a net generating power from the first device, wherein 80% or higher of the total surface area of the first device is heated and/or cooled with the heat source.

Abstract: The electric motor control device includes: an inverter circuit 20 which converts DC power of a DC power supply 90 into AC power; and a switching control section 60 which performs on/off control of a semiconductor switching element composing the inverter circuit. The switching control section 60 includes: a power-supply-side abnormality determination section 62 which determines whether a power-supply-side abnormal state is established in which regenerative energy from an electric motor 10 cannot be regenerated to the DC power supply; and a switching frequency changeable section 63 which changes, when the power-supply-side abnormality determination section has determined that the power-supply-side abnormal state has been established, a switching frequency of the semiconductor switching element such that an overall loss, which is a total of loss in the inverter and loss in the electric motor, is increased.

Abstract: A power supply device for supplying power to a load by combining a secondary battery and a capacitor includes a bypass switch which enables power to be directly supplied to the load from the capacitor by being switched to a connected state when a voltage of the capacitor is a voltage capable of driving the load, and a first DC-DC converter which enables the voltage of the capacitor to be stepped up and supplied to the load when the voltage of the capacitor drops below a minimum voltage capable of driving the load.

Abstract: A method controls a motor using pulse width modulation (PWM). The method involves measuring the PWM frequency; determining the carrier frequency of a set radio transmitter; and matching the PWM frequency to the carrier frequency of the radio transmitter in such a manner that an integer multiple of the PWM frequency corresponds to the carrier frequency or an integer multiple of the PWM frequency lies in the middle between two carrier frequencies.

Abstract: An apparatus for controlling force of a magnetic lead screw actuator includes a magnetic lead screw actuator, an external control module and at least one sensor device integrated within the magnetic lead screw actuator. The magnetic lead screw actuator includes an electric machine, a rotor, and a translator. The rotor includes a rotor magnet assembly forming first helical magnetic threads along the rotor and the translator includes a translator magnet assembly forming second helical magnetic threads along the translator. Rotation of the rotor by the electric machine effects linear translation of the translator by interaction of the first and second helical magnetic threads. The external control module is electrically operatively coupled to an electric machine controller of the magnetic lead screw actuator.

Abstract: The system contains a controller unit comprising a memory device, a processing unit, and at least one analog-to-digital converter. A power stage has a plurality of switches, wherein the power stage receives a control signal from the control circuit and a power signal from a power source. The power stage drives two windings of the set of three stator windings to rotate a rotor and maintains one stator winding of the three stator windings undriven. The memory device stores a plurality of values for the driven current and a plurality of demodulated undriven winding voltages. The processing unit compares the plurality of values and periodically calculates a rotor sextant while the rotor rotates. The processing unit compares at least two demodulated undriven winding voltage values corresponding to at least two current values within the rotor sextant to calculate the rotor sextant parity and verify the calculation of the rotor sextant.

Abstract: A direct-current power supply device includes a rectifier connected to a power supply, a charge storage unit configured by a first capacitor and a second capacitor connected in series, a switching unit configured by a first switching element 4a and a second switching element connected in series and backflow preventing elements that suppress a backflow of electric charges from the charge storage unit, a reactor, a control unit that controls operations of the first switching element and the second switching element, and a direct-current-voltage detecting unit that detects a first both-end voltage, which is a voltage across the first capacitor, and a second both-end voltage, which is a voltage across the second capacitor. The control unit detects, on the basis of a voltage difference between the first both-end voltage and the second both-end voltage, a short-circuit failure of one of the first switching element and the second switching element.

Abstract: A motor drive device includes: an inverter circuit that has three switching elements corresponding to three phases of a three-phase motor coil, converts a DC applied voltage of a power source to an AC voltage by a PWM, and output the AC voltage to the motor coil; a voltage detection device for the DC applied voltage; and a control device that controls the PWM. The control device selects a first modulation method, for fixing the on/off-state of a part of the switching elements and for switching the on/off-state of the other part of the switching elements, or a second modulation method, for switching the on/off-state of the switching elements corresponding to three phases. The control device switches from the first modulation method to the second modulation method when the DC applied voltage is equal to or greater than a predetermined voltage, and the first modulation method is selected.

Abstract: A device for determining a rotor position in a polyphase electric motor has a power control unit for applying drive voltages according to a pulse width modulation scheme so as to synchronously drive the motor. A measurement unit is arranged for measuring a voltage value on a respective phase by determining a zero-crossing interval where the phase current is around zero, disconnecting the phase from the respective drive voltage during the zero-crossing interval, and measuring the voltage value when the drive voltage of a first other phase is the supply voltage and the drive voltage of a second other phase is the zero voltage. A position unit is arranged for determining the rotor position based on the voltage value.

Abstract: An apparatus includes a motor driver configured to drive a motor across a pair of input terminals to the motor and a current sense unit configured to sense the motor's electrical current amplitude. Further, an angular frequency extractor is operatively coupled to the motor driver and the current sense unit and configured to detect discontinuities in the motor's electrical current amplitude. The angular frequency extractor also is configured to determine a time period for one complete revolution of a rotor of the motor and to generate a feedback signal based on the determined period to control an angular frequency of the motor. The feedback signal may be used to adjust how the motor is being driven (e.g., to slow the motor down or speed it up).

Abstract: In a power generator, a determiner determines whether a phase voltage output from each of multiphase armature windings has exceeded a threshold voltage. A turn-on unit turns on at least one of the protective switches as a target protective switch to limit the output voltage of the rectifier circuit to be lower than the threshold voltage upon the phase voltage output from at least one of the multiphase armature windings corresponding to the at least one of the protective switches has exceeded the threshold voltage.

Abstract: A method and apparatus for operating a generator control unit having power bridge, further including having an input and at least one output, wherein the input is operably coupled with a generator power output, and a controller communicatively coupled with the power bridge and configured to operate the power bridge.

Abstract: A generator having an electronic governor for controlling the speed of an engine to generate an output voltage from an alternator is disclosed. The generator includes an alternator coupled to an engine to generate an output voltage. The variable speed of the engine allows the alternator to generate a variable output voltage. An electronic governor monitors a time period between voltage benchmarks on the output voltage. The electronic governor compares the monitored time period to a reference time period and adjusts the position of the throttle based upon the comparison between the monitored time period and the reference time period. The reference time period is set based upon the desired output voltage frequency. In an alternate embodiment, the electronic governor senses the current draw from the alternator and adjusts the position of the throttle to prevent changes in the frequency of the output voltage.

Abstract: A power distribution system is described that does not rely on a fixed frequency and which therefore allows prime movers to run at different speeds in response to load demand, typically so that fuel consumption and/or harmful exhaust emissions is/are minimised. A marine power distribution and propulsion system can include an ac busbar adapted to carry a variable-frequency ac distribution voltage. A plurality of ac generators are connected to the busbar, each having an associated prime mover such as a diesel engine, turbine etc. A power management controller is adapted to vary the rotational speed of the prime movers with reference to the electrical load on the ac busbar such that the generators provide a variable frequency output during normal operation of the power distribution system. Such operation is to be contrasted with conventional distribution systems which have a fixed frequency.

Abstract: Method and systems are provided for adjusting an engine load exerted on a vehicle engine by an alternator mechanically coupled to said engine. In one example, a method may include when decelerating a vehicle driven by an engine, recharging a battery by an alternator driven by said engine, and during engine idle speed control, when engine speed is less than desired, in a first mode reducing electrical power to selected devices, and in a second mode offsetting a set point of desired engine ignition timing to a new set point when engine speed is higher than desired.

Abstract: In an ?? coordinate system, vectors of currents flowing in three-phase AC motor are set in directions fixed relative to a zero vector current according to a voltage applied in six non-zero vector switching modes of an inverter. A current vector closest to a command current value is specified from those current vectors. Then, only a non-zero vector current when operating the inverter in the non-zero vector switching mode corresponding to the specified current vector is calculated.

Abstract: A control device, linear device, non-transitory computer readable medium and method by which optimal vibration damping can also be achieved in a simple manner when transferring a carrier from one segment to the next segment, where a primary part includes a plurality of sequentially consecutive segments that are each connected to a supply voltage via a respective converter, such that each of plurality of sequentially consecutive the segments receive respective currents of a three-phase system.

Abstract: A personal hygiene device has a resonant motor and a motor control unit for applying a periodic voltage signal with a driving frequency at the resonant motor for driving the resonant motor into an oscillating motion with an oscillating frequency equal to the driving frequency. The motor control unit comprises a synthesizer circuit for digitally synthesizing the periodic voltage signal from voltage pulses of variable length provided with a pulse frequency higher than the driving frequency such that at least two voltage pulses are applied at least in one of two half cycles of each period of the periodic voltage signal.

Abstract: A system and method are provided for saving energy for an electric motor having periodic load variations by reducing the supply voltage to the motor during an open loop mode. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller computes information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value. By allowing some current flow, primarily of a reactive nature, an observable feedback parameter may be used in the closed loop control system as an indication of the load condition, to which the closed loop motor controller may react, supplying power when needed, such as in the energy consumption mode.

Abstract: In a system that receives power from an electric power grid, a variable frequency AC drive has an output connected to an AC electric motor, and an input connected to the power grid. The motor is in 1 connection with a load, and the AC drive includes an active converter having a predetermined maximum apparent power capacity. The converter is coupled to a controller programmed to regulate reactive power generation and consumption of the variable frequency AC drive so that the drive produces reactive power when the converter is utilizing less than its maximum apparent power capacity. This reactive power is fed to the power grid. A device monitors current and voltage in the power grid and calculates power factor, which is then used as a feedback to an external controller that generates a reactive power reference signal intended to control the system's power factor.

Abstract: In order to highly accurately estimate a temperature of a permanent magnet to be used for a rotor of a motor, provided is a motor control device for a vehicle including a motor as a drive power source, in which an estimation mode setting section sets, when a predetermined condition for estimating the temperature of the permanent magnet to be used for the rotor of the motor is established under a state in which the motor generates drive power to run the vehicle, a current flowing through the motor to 0, and a permanent magnet temperature estimation section estimates the temperature of the permanent magnet based on an induced voltage of the motor in a period during which the current flowing through the motor is 0.

Abstract: A system for mounting a solar panel(s) on a building, where the solar panel has an outer frame defining a lip. The system may include a plurality of panel mounting brackets each including a base to be positioned on the building, and a vertical extension having a proximal end coupled to the base and a distal end vertically spaced apart from the base, with the distal end defining a fastener channel therein. The system may also include a plurality of mounting clamps each including a bottom flange, and a top flange spaced apart from the bottom flange and partially overhanging the bottom flange and defining a slot therebetween to receive the lip. An end extension may couple respective ends of the bottom flange and top flange together, and a fastener channel connector may be coupled to the bottom flange and configured to be slidably received within the fastener channel.

Abstract: A photovoltaic module mounting system may include a right-hand support runner and a left-hand support runner. The support runners collectively define a rooftop contacting plane and a photovoltaic module support plane oriented at a predetermined angle relative to the rooftop contacting plane. The support runners may be interconnected with each other, and with additional support runners, to form an interconnected support structure that can be used to mount an array of photovoltaic modules upon a planar surface such as a building rooftop.

Abstract: A semiconductor circuit includes an oscillation circuit; an output circuit that receives a first oscillation signal from the oscillation circuit and outputs a second oscillation signal; a DC circuit that receives a voltage based on a power supply voltage and outputs at least one of a DC voltage and a DC current; and a semiconductor substrate on which the oscillation circuit, the output circuit, and the DC circuit are formed. In a plan view of the semiconductor substrate, the DC circuit is disposed between the oscillation circuit and the output circuit.

Abstract: A wiring pattern for oscillation input signal and a wiring pattern for oscillation output signal are provided on a printed circuit board, and a wiring pattern for ground power source voltage is arranged in a region therebetween. A quartz crystal unit is connected between the wiring pattern for oscillation input signal and the wiring pattern for oscillation output signal and one ends of capacitors serving as load capacitors thereof are connected to the wiring pattern for ground power source voltage. Further, a wiring pattern for VSS is arranged so as to enclose these wiring patterns, and a wiring pattern for VSS is arranged also in a lower layer in addition thereto. By this means, reduction of a parasitic capacitance between an XIN node and an XOUT node, improvement in noise tolerance of these nodes and others can be achieved.

Abstract: An oscillation circuit includes a terminal XO, a terminal XI, an oscillation unit, and a voltage generation circuit that generates a first voltage and a second voltage. The oscillation unit includes a variable capacitive element connected to the terminal XO or the terminal XI. In a first mode, a signal having a first amplitude is applied between the terminal XO and the terminal XI, and a first voltage is applied to the other end of the variable capacitive element. In a second mode, a signal having a second amplitude larger than an amplitude of the signal having the first amplitude is applied between the terminal XO and the terminal XI, a second voltage is applied to the other end of the variable capacitive element, and a voltage applied to the both ends of the variable capacitive element is lower than the maximum rated voltage of the variable capacitive element.

Abstract: Apparatus and methods for multi-mode low noise amplifiers (LNAs) are provided herein. In certain configurations, a radio frequency (RF) system includes a multi-mode LNA including at least a first amplification stage and a second amplification stage electrically connected in a cascade. The RF system further includes a mode control circuit, which receives a mode selection signal and controls the biasing of the first and second amplification stages based on the mode selection signal. The mode control circuit operates the multi-mode LNA in one of a plurality of modes including both a first mode in which the LNA operates with higher gain and better noise figure and a second mode in which the LNA operates with lower gain and higher linearity. Controlling the mode of the multi-mode LNA using the mode selection signal allows the multi-mode LNA to advantageously achieve both the benefits of low noise figure and high linearity.

Abstract: There is disclosed an envelope tracking modulated supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a low frequency path for tracking low frequency variations in the reference signal and including a switched mode power supply, a correction path for tracking high frequency variations in the reference signal and including a linear amplifier, a feedback path from the output of the linear amplifier to the input of the linear amplifier, and a combiner for combining the output of the switched mode power supply and the output of the linear amplifier to generate a modulated supply voltage.

Abstract: An envelope tracking power supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a first path for tracking low frequency variations in the reference signal and a second path for tracking high frequency variations in the reference signal, and further comprising a combiner having a low frequency combining element for the first path and a high frequency combining element for the second path, and for generating the modulated supply voltage, wherein there is further provided sensing circuitry for sensing a resonance signal in the low or high frequency combining element, and adjusting circuitry for adjusting a signal in the first path in dependence on the sensed resonance signal.

Abstract: Electric charge is stored, in accordance with a bias voltage, in a gate of a transistor performing switching operation between an input terminal and an output terminal, and the gate is brought into an electrically floating state at the time of completing the storage of electric charge in the gate. One electrode of a capacitor is connected to the gate in an electrically floating state, and the potential of the other electrode of the capacitor is increased, so that the voltage of the gate is increased using capacitive coupling. The potential of the gate of the transistor is increased, and the bias voltage is sampled without being decreased. Each of the transistor performing switching operation and a transistor connected to the gate of the transistor is a transistor with an extremely low off-state current.

Abstract: The embodiments described herein provide compensation for mutual inductance in a multi-path device. In one embodiment, a device includes a multi-path integrated device. The multi-path integrated device includes a first output and a second output. The first output is configured to be coupled to a first output lead through a first bonding wire, and the second output is configured to be coupled to a second output lead through a second bonding wire. Due to their proximity, the second bonding wire has a first mutual inductance with the first bonding wire. A first compensation network is coupled to the first output, and a second compensation network is coupled to the second output. The second compensation network is configured to have a second mutual inductance with the first compensation network. The second mutual inductance at least partially cancels the effects of the first mutual inductance.

Abstract: A common-mode feedback circuit includes a transconductor input stage with differential input terminals, and a frequency-compensated gain stage coupled to the transconductor input stage with differential output terminals. The common-mode feedback circuit also includes a feedback loop having a comparator configured to produce a feedback error signal for the transconductor input stage by comparing with a reference a common-mode sensing signal indicative of a common-mode voltage level sensed at the differential output terminals. In addition, the common-mode feedback loop includes a converter for converting the common-mode voltage level sensed at said differential output terminals into a current signal coupled to the comparator.

Abstract: Systems, circuits and methods related to dynamic error vector magnitude (DEVM) corrections. In some embodiments, a power amplifier (PA) system can include a PA circuit having a plurality of amplification stages, and a bias system in communication with the PA circuit and configured to provide bias signals to the amplification stages. The PA system can further include a first correction circuit configured to generate a correction current that results in an adjusted bias signal for a selected amplification stage, with the adjusted bias signal being configured to compensate for an error vector magnitude (EVM) during a dynamic mode of operation. The PA system can further include a second correction circuit configured to change the correction current based on an operating condition associated with the PA circuit.

Abstract: A method of linearizing a relationship between a signal to an amplifier and an output signal from the amplifier includes applying an inverse of a transfer function of the amplifier to the signal prior to presenting the signal as the amplifier input. The inverse transfer function is represented by a polynomial defined by a set of coefficients. The transmitter output signal is measured by the idle receiver in a time division duplex system. The output signal is filtered to isolate intermodulation products of a selected order and the peak power of the isolated intermodulation products is then estimated. An adaptive algorithm is applied in response to the estimate of the peak power to update the set of coefficients of the polynomial representing the inverse of the transfer function of the amplifier.

Abstract: An apparatus includes: first and second transistors, each of the first and second transistors includes a gate terminal, a source terminal, and a drain terminal; and a transformer including a primary winding and first and second secondary windings, the primary winding is coupled to a first input node configured to receive an input signal and a second input node configured to receive a potential, the first and second secondary windings are coupled to gate terminals of the first and second transistors and cross-coupled to source terminals of the first and second transistors.