Abstract: Techniques for providing multiple power supplies in electronic devices are disclosed. According to one aspect of the present invention, an appropriate power supply is provided only to accommodate a volume setting. In other words, there are at least two power supplies, one with a low voltage and the other with a high voltage. The high voltage power supply is only applied when there is a need to accommodate a volume setting. Thus the power consumption of the amplifiers is well controlled. As a result, the designs of the device and heat dissipation therein can be simplified and lowered in cost.

Abstract: The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.

Abstract: A data receiver, a method of operating a data receiver, and an integrated coupling system in a data receiver are disclosed. In one embodiment, the data receiver comprises an input terminal for receiving an input data signal, an input amplifier for amplifying selected components of the input data signal, and an input signal path for transmitting specified high-frequency components and a baseline component of the input data signal from the input terminal to the input amplifier. The data receiver further comprises a feed-forward resistive network connected to the input terminal and to the input amplifier. This feed forward resistive network is used to forward a low-frequency drift compensation signal from the input terminal to the input amplifier, using a passive resistive network, to compensate for low frequency variations in the input data signal, and to develop a desired bias voltage at the input amplifier.

Abstract: There is disclosed a multi-stage amplifier comprising: a first amplifier stage; a second amplifier stage; a first voltage supply stage arranged to provide a supply voltage to the first amplifier in dependence on an average power of a signal to be amplified; and a second voltage supply stage arranged to provide a supply voltage to the second amplifier in dependence on an instantaneous power of a signal to be amplified.

Abstract: Signal timing adjustment in an amplifying device is appropriately performed by phase adjustment by a digital filter. The amplifying device includes an amplifier; an amplitude-voltage converting unit 12 that performs a desired process on a signal relating to operation of the amplifier, whereby the signal is band-broadened; and a timing adjusting unit 15a that performs timing adjustment of the signal to be provided to the amplifier, by phase adjustment by a digital filter. The timing adjusting unit 15a performs the timing adjustment of the signal at a stage before the signal is band-broadened by the amplitude-voltage converting unit 12.

Abstract: An envelope-tracking (ET) power supply may include a boost control pin. The boost control pin receives a boost enable signal that activates or enables a supplemental power supply in the ET power supply. The supplemental power supply facilitates the generation of a power supply signal for a selected processing stage, e.g., a power amplifier. The supplemental power supply helps the processing stage meet the demands on it caused by the signal that the processing stage needs to handle.

Abstract: A control device of a power amplifier includes: a limiter configured to limit a level of an input signal to the power amplifier; and a control unit configured to, when the limiter operates, make an operation voltage of the power amplifier invariable and control load of an output matching circuit of the power amplifier based on an amplitude of the input signal, and, when the limiter does not operate, to make the load of the output matching circuit invariable and control the operation voltage of the power amplifier.

Abstract: A power supply injects a series of “tickle” pulses into a pulse width modulated (PWM) controller to induce the controller to generate PWM pulses at a minimum switching frequency, preferably one that is super-sonic (especially for audio applications). The switching frequency may also be selected or controlled such that it avoids resonances in the power supply. The “tickle” pulses may be clocked by the same clock that times the PWM controller, and they may be shaped to help ensure that the power supply maintains some regulation during low-load conditions.

Abstract: A radio frequency (RF) system includes an RF power amplifier (PA), which uses an envelope tracking power supply voltage to provide an RF transmit signal, which has an RF envelope; and further includes an envelope tracking power supply, which provides the envelope tracking power supply voltage based on a setpoint. RF transceiver circuitry, which includes envelope control circuitry and an RF modulator is disclosed. The envelope control circuitry provides the setpoint, such that the envelope tracking power supply voltage is clipped to form clipped regions and substantially tracks the RF envelope between the clipped regions, wherein a dynamic range of the envelope tracking power supply voltage is limited. The RF modulator provides an RF input signal to the RF PA, which receives and amplifies the RF input signal to provide the RF transmit signal.

Abstract: A self-setting power supply monitors a supply current drawn by a power amplifier and sets a supply voltage based on the supply current to achieve efficient power operation. In order to maintain operation of the power amplifier above minimum operating conditions, the self-setting power supply sets the supply voltage to the minimum operating voltage when the supply current drops below a threshold bias current. When the supply current is above the threshold bias current, the self-setting power supply adjusts the supply voltage approximately proportionally to the supply current to maintain approximately constant gain of the power amplifier.

Abstract: A radio frequency (RF) power amplifier (PA) and an envelope tracking power supply are disclosed. The RF PA receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply voltage. The envelope tracking power supply provides the envelope power supply voltage based on a setpoint, which has been constrained so as to limit a noise conversion gain (NCG) of the RF PA to not exceed a target NCG.

Abstract: There is disclosed a method and apparatus for generating an output signal comprising a replica of an input signal, comprising the steps of: generating a replica signal representing the low frequency content of the input signal; generating an error signal representing an error in the replica signal; combining the replica signal with the error signal to generate an output signal; and wherein the step of generating the error signal further includes the steps of: generating a delay signal being a delayed version of the input signal; and determining a difference between the output signal and the delay signal which difference is the error signal.

Abstract: A multi-mode amplifier system includes a supply converter and a multi-stage amplifier. The supply converter is configured to generate a plurality of varied supply signals according to an output power mode. The multi-stage amplifier is configured to generate an RF output signal from an RF input signal according to the varied supply signals.

Abstract: A power module for envelope tracking includes a linear amplifier and a DC-to-DC (Direct Current to Direct Current) converter. The linear amplifier has a positive input terminal for receiving a first control signal, a negative input terminal, and an output terminal for outputting a first adaptive supply voltage, wherein the output terminal is fed back to the negative input terminal. The DC-to-DC converter receives a second control signal, and supplies a second adaptive supply voltage to the linear amplifier according to the second control signal. The first control signal is related to the second control signal.

Abstract: A method and system controls a transition between utilizing an envelope tracking (ET) mechanism and using an average power tracking (APT) mechanism to provide power to a power amplifier. A power amplifier controller (PAC) initiates an ET mechanism to track changes in amplitudes of a radio frequency (RF) signal being received by the power amplifier. If the PAC determines that the RF signal bandwidth is low and the average amplitude is at least equal to a threshold value, the PAC maintains the ET mechanism. If the RF signal bandwidth is high and/or the average amplitude of the RF signal is less than the threshold value, the PAC temporarily deactivates the ET mechanism and controls a transition to utilizing the APT mechanism by properly synchronizing the transition to the change in average signal amplitude levels so there are no undesired transients affecting signal quality or spectrum.

Abstract: A multi-mode, dynamic, DC-DC converter supplies a dynamically varying voltage, as required, from a battery to an RF power amplifier (PA). In envelope tracking mode, a fast DC-DC converter generates a dynamic voltage that varies based on the amplitude envelope of an RF signal, and regulates the voltage at the PA. A slow DC-DC converter generates a steady voltage and regulates the voltage across a link capacitor. The fast and slow converters are in parallel from the view of the PA, and the link capacitor is between the fast converter and the PA. Because different nodes are regulated, no current sharing is possible between the converters. The link capacitor boosts the dynamic voltage level, allowing a maximum dynamic voltage at the load to exceed the battery voltage. In power level tracking mode, the fast converter is disabled and the link capacitor is configured to be in parallel with the load.

Abstract: Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data.

Abstract: An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit includes a low-frequency power supply path including a switching regulator and a high-frequency power supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply is provided by the low-frequency power supply path and high-frequency power supply path. The high-frequency power supply path includes: an amplifier including a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a capacitor operably coupled to the output of the amplifier and arranged to perform dc level shifting of the power supply signal.

Abstract: There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator.

Abstract: An apparatus for amplifying power is provided. The apparatus includes a supply modulator for generating a supply voltage based on an amplitude component of a transmission signal, and a power amplify module for amplifying power of the transmission signal using the supply voltage, wherein the power amplify module includes a first power amplifier and a second power amplifier, and when an output power of the transmission signal is greater than a reference power, the first power amplifier amplifies the power of the transmission signal using the supply voltage, and when the output power of the transmission signal is equal to or less than the reference power, the second power amplifier amplifies the power of the transmission signal using the supply voltage.

Abstract: Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes an envelope tracker configured to provide a supply voltage to a plurality of power amplifiers. The power amplifiers include power supply inputs electrically connected in a star configuration so as to reduce a capacitive load of the envelope tracker. The distributed capacitance of the power amplifiers is used to provide RF grounding so as to reduce the size of or eliminated the use of bypass capacitors.

Abstract: Aspects disclosed herein relate to using a processor controlled switcher architecture with a high-efficiency PA control. A wireless communications device may be include a processor, a power amplifier and a processor controller PA switcher. In an aspect, the processor may be a modem, a RF chip, etc. In one example, the PA switcher may be configured to receive a switcher control signal on the control line. In an aspect, the switcher control signal may be based on future characteristics of an input signal. The PA switcher may be further configured to select a voltage path from among a plurality of voltage paths based on the switcher control signal to provide a supply voltage to the lower pass filter associated with the PA.

Abstract: Techniques for reducing ringing arising from L-C coupling in a boost converter circuit during a transition from a boost ON state to a boost OFF state. In an aspect, during an OFF state of the boost converter circuit, the size of the high-side switch coupling a boost inductor to the load is gradually increased over time. In this manner, the on-resistance of the high-side switch is decreased from a first value to a second (lower) value over time, which advantageously reduces ringing (due to high quality factor or Q) when initially entering the OFF state, while maintaining low conduction losses during the remainder of the OFF state. Further techniques are provided for implementing the high-side switch as a plurality of parallel-coupled transistors.

Abstract: A parallel amplifier and a parallel amplifier power supply are disclosed. The parallel amplifier power supply provides a parallel amplifier power supply signal, which is adjustable on a communications slot-to-communications slot basis. During envelope tracking, the parallel amplifier regulates an envelope power supply voltage based on the parallel amplifier power supply signal.

Abstract: A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element. The offset capacitive element has an offset capacitive voltage. The offset capacitance voltage control loop regulates the offset capacitive voltage, which is adjustable on a communications slot-to-communications slot basis.

Abstract: An apparatus is provided that comprises a test circuit; a first receiver unit arranged to receive test commands and to provide the test commands to the test circuit; a power supply unit arranged to supply power to the test circuit and to the first receiver unit; a second receiver unit arranged to receive power commands. The second receiver is arranged to control the operation of the power supply unit in response to the power commands received by the second receiver unit.

Abstract: A power supply control circuit includes a mode controlling unit which, in accordance with an output voltage of an amplifying section, performs a mode up for switching a current power supply voltage of the amplifying section to a higher power supply voltage being higher than the current power supply voltage, and which, in a case where a magnitude of the output voltage of the amplifying section is smaller than a threshold voltage for a predetermined time period or longer, performs a mode down for switching the power supply voltage of the amplifying section to a lower power supply voltage being lower than the current power supply voltage, and a threshold setting unit which sets the threshold voltage based on the output voltage of the amplifying section at a timing when the mode up is performed.

Abstract: Techniques for bypassing a supply voltage for an amplifier are disclosed. In an exemplary design, an apparatus includes an amplifier and an adjustable bypass circuit. The amplifier (e.g., a power amplifier) receives a supply voltage from a supply source. The adjustable bypass circuit is coupled to the supply source and provides bypassing for the supply voltage. The adjustable bypass circuit includes an adjustable capacitor or a fixed capacitor coupled to an adjustable resistor. The supply source may be (i) a power supply source providing a fixed supply voltage for the amplifier or (ii) an envelope tracker providing a variable supply voltage for the amplifier.

Abstract: An envelope detector includes an input receiving a digital input signal indicative of a magnitude of a signal to be amplified by a power amplifier. A circuit is provided for generating an analog envelope signal based on the digital input signal. The envelope detector includes an output for outputting the analog envelope signal.

Abstract: The present invention relates to a system for boosting the power supply of an RF power amplifier in high peak to average power ratio applications, wherein said power amplifier is coupled to receive and amplify a digital data stream of a baseband signal, (e.g., which after modulation with a carrier wave are supplied as the RF input signal to said power amplifier to generate an RF output signal).

Abstract: A front end radio architecture (FERA) with power management is disclosed. The FERA includes a first power amplifier (PA) block having a first-first PA and a first-second PA, and a second PA block having a second-first PA and a second-second PA. First and second modulated switchers are adapted to selectively supply power to the first-first PA and the second-first PA, and to supply power to the first-second PA and the second-second PA, respectively. The first and second modulated switchers have a modulation bandwidth of at least 20 MHz and are both suitable for envelope tracking modulation. A control system is adapted to selectively enable and disable the first-first PA, first-second PA, the second-first PA, and the second-second PA. First and second switches are responsive to control signals to route carriers and received signals between first and second antennas depending upon a selectable mode of operation such as intra-band or inter-band operation.

Abstract: An amplifying device 1 of the present invention performs distortion compensation on distortion appearing in input-output characteristics of an amplifier 4 based on an input signal and an output signal of the amplifier 4, and includes a predistorter 23 that obtains the input signal and the output signal and performs distortion compensation of the amplifier; an ACLR calculation unit 25 that detects the distortion level of the distortion of the amplifier 4; and an adjustment unit 26 that adjusts the power of the input signal in accordance with the distortion level.

Abstract: Embodiments for at least one method and apparatus of a voltage supply are disclosed. One voltage supply apparatus includes a voltage supply, a plurality of power amplifier (PA) decoupling circuits, and a plurality of power amplifiers. Each PA decoupling circuit is connected to the voltage supply and provides a filtered voltage supply to a corresponding one of the plurality power amplifiers. Each PA decoupling circuit configured to suppress noise of the provided filtered voltage supply below a threshold at one or more selected frequencies, wherein the suppression is provided by the PA decoupling circuit operating in conjunction with at least one other of the plurality of PA decoupling circuits.

Abstract: A power amplifier includes: an amplifier; a matching circuit, including a variable reactance magnetic device having a reactance which varies in accordance with a magnetic field, configured to match an output of the amplifier with a certain impedance; an amplitude detector configured to detect the amplitude of an input signal for the amplifier; and a magnetic-field control circuit configured to apply a magnetic field corresponding to the amplitude detected by the amplitude detector to the variable reactance magnetic device.

Abstract: Embodiments of the present invention include a method and system for control of a multiple-input-single output (MISO) device. For example, the method includes determining a change in power output level from a first power output level to a second power output level of the MISO device. The method also includes varying one or more weights associated with respective one or more controls of the MISO device to cause the change in power output. The one or more controls can include one or more of (a) a phase control of one or more input signals to the MISO device, (b) a bias control of the MISO device, and (c) an amplitude control of the input signals to the MISO device.

Abstract: An electronic device includes an amplifier which is configured to amplify a sound signal and includes a vacuum tube including a heater configured to heat the vacuum tube; a voltage supply which is configured to supply a first voltage and a second voltage which is higher than the first voltage; and a controller which is configured to control the voltage supply to supply the second voltage to the heater in response to supply of a drive voltage to the amplifier being started and to supply the first voltage to the heater if the vacuum tube reaches a predetermined temperature.

Abstract: A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit, determining combinations of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power, obtaining battery current indications for the determined combinations of the power amplifier supply voltage and power amplifier input power, selecting a combination of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power based at least partly on the obtained battery current indications therefore, and calibrating the envelope tracking system using the selected combination of the power amplifier supply voltage and power amplifier input power.

Abstract: There is disclosed a multi-stage amplifier comprising: a first amplifier stage; a second amplifier stage; a first voltage supply stage arranged to provide a supply voltage to the first amplifier in dependence on an average power of a signal to be amplified; and a second voltage supply stage arranged to provide a supply voltage to the second amplifier in dependence on an instantaneous power of a signal to be amplified.

Abstract: A power circuit and a method thereof are provided. The method includes: determining, by a power controller, a first signal is to be transmitted in the continuous mode or the burst mode; when the first signal is to be transmitted in the continuous mode, activating, by a power controller, a continuous mode converter; when activated, converting, by the continuous mode converter, a first voltage down to a second voltage and supplying the second voltage to the first power amplifier; when the first signal is to be transmitted in the burst mode, activating, by a power controller, a burst mode converter; when activated and the first power amplifier is inactive, receiving, by a burst mode converter, a first current to accumulate a burst energy; and when activated and the first power amplifier is active, supplying, by the burst mode converter, the burst energy to the first power amplifier.

Abstract: A power train amplification stage is described. The power train amplification stage includes a power amplifier. The power train amplification stage also includes a switched mode power supply that provides a bias voltage to the power amplifier. The power train amplification stage further includes a pulse density modulator. The power train amplification stage also includes a feedback path from the power amplifier to the pulse density modulator.

Abstract: An energy converter based transmitter, a method, a multi-element antenna array are provided for a radio frequency (RF) transmission. For example, the energy converter based transmitter can include a control circuit, a multiple input single output (MISO) operator, and an antenna. The control circuit is configured to receive input information and generate amplitude control signals and phase control signals. The MISO operator is configured to receive the amplitude control signals and the phase control signals and to generate an RF output signal. Further, the antenna is configured to receive and transmit the RF output signal.

Abstract: Techniques for controlling boost converter operation in an envelope tracking (ET) system. In an aspect, an enable generation block is provided to generate an enable signal for a boost converter, wherein the enable signal is turned on in response to detecting that a sum of a first headroom voltage and an enable peak of a tracking supply voltage is greater than an amplifier supply voltage of the ET system. The enable signal may be turned on for a predetermined enable on duration. In another aspect, a target generation block is provided to generate a target voltage for the boost converter, wherein the target voltage comprises the sum of a second headroom voltage and a target peak of the tracking supply voltage.

Abstract: An audio amplifier is powered by a switch mode power supply optimized for audio applications. The power supply includes a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit and does not require a separate power factor correction stage. The discontinuous mode multiphase isolated flyback power circuit includes multiple isolated flyback converters operating synchronously to each convert a portion of the power and supply a phase-summed direct current voltage to the audio amplifier.

Abstract: A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.

Abstract: A fast tracking power supply device, a fast tracking power supply control method, and communication equipment are provided. The fast tracking power supply device includes: a basic voltage output unit, configured to output a basic voltage; a basic current unit, configured to output a basic current; a linear amplifier, configured to output a compensation current and a compensation voltage, the linear amplifier is connected in parallel with the basic current output unit, and then is connected in series with the basic voltage output unit. The device can output signal with high efficiency and bandwidth.

Abstract: Various embodiments are directed to apparatuses and methods to reduce average power dissipation in transceiver stages such as power amplifiers and low noise amplifiers (LNAs) that process signals of varying output amplitudes. Power dissipation may be reduced by varying the supply voltage in sympathy with the amplitude of the signal and/or the stage current density which may also be varied in sympathy with the signal amplitude.

Abstract: An amplifier implementing with a common base circuit is disclosed. The amplifier includes the common base circuit, a current shunt, and a current supplement. The common base circuit receives an input current. The current shunt shunts the input current based on the average of the output of the pre-amplifier. The current supplement supplements a current shunted by the current shunt.

Abstract: A dynamic power supply for N amplifiers includes first and second power boost circuits which temporarily boost the positive or negative power supply rail, respectively. A control circuit monitors amplifier output signal levels and provides power boost control signals to the power boost circuits, which temporarily raise the positive supply voltage above the nominal voltage level in tandem with the highest output signal from the N amplifiers and lower the negative supply voltage below the nominal voltage level in tandem with the lowest output signal level from the N amplifiers. The power boost circuits each may be coupled to a reservoir capacitor from which current is drawn to provide the power boost. When inactive, the reservoir capacitors charge up from the respective power supply rails. The dynamic power supply is well suited for audio amplification systems.

Abstract: Aspects of the present disclosure relate to a current multiplier that can generate an output current with high linearity and/or high temperature compensation. Such current multipliers can be implemented by complementary metal oxide semiconductor (CMOS) circuit elements. In one embodiment, the current multiplier can include a current divider and a core current multiplier. The current divider can generate a divided current by dividing an input current by an adjustable division ratio. The division ratio can be adjusted, for example, based on a comparison of the input current with a reference current. The core current multiplier can generate the output current based on multiplying the divided current and a different current. According to certain embodiments, the output current can be maintained within a predetermined range as the input current to the current divider varies within a relatively wide range.

Abstract: A switch mode power supply converter, a parallel amplifier, and a parallel amplifier output impedance compensation circuit are disclosed. The switch mode power supply converter provides a switching voltage and generates an estimated switching voltage output, which is indicative of the switching voltage. The parallel amplifier generates a power amplifier supply voltage at a power amplifier supply output based on a combination of a VRAMP signal and a high frequency ripple compensation signal. The parallel amplifier output impedance compensation circuit provides the high frequency ripple compensation signal based on a difference between the VRAMP signal and the estimated switching voltage output.