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WO2011115533A1 - Hybride de commutation de suivi d'enveloppe - Google Patents

Hybride de commutation de suivi d'enveloppe Download PDF

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Publication number
WO2011115533A1
WO2011115533A1 PCT/SE2010/050292 SE2010050292W WO2011115533A1 WO 2011115533 A1 WO2011115533 A1 WO 2011115533A1 SE 2010050292 W SE2010050292 W SE 2010050292W WO 2011115533 A1 WO2011115533 A1 WO 2011115533A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
operating regime
signal
during
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2010/050292
Other languages
English (en)
Inventor
Jan Johansson
Mikael Appelberg
Anders Aronsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to PCT/SE2010/050292 priority Critical patent/WO2011115533A1/fr
Publication of WO2011115533A1 publication Critical patent/WO2011115533A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control
    • H03F1/025—Stepped control by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/102—A non-specified detector of a signal envelope being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/324—An amplitude modulator or demodulator being used in the amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/504—Indexing scheme relating to amplifiers the supply voltage or current being continuously controlled by a controlling signal, e.g. the controlling signal of a transistor implemented as variable resistor in a supply path for, an IC-block showed amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/507—A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H03F2203/21193—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers the supply voltage of a power amplifier being continuously controlled, e.g. by an active potentiometer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H03F2203/21196—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers the supply voltage of a power amplifier being switchable controlled

Definitions

  • Example embodiments are directed towards a hybrid envelope tracking system capable of transitioning between an active, passive, and/or switching operating regime with minimized parasitic oscillations.
  • Radio frequency power amplifiers are a type of electronic amplifier used to convert low-power radio-frequency signals into larger signals of significant power, which are generally employed in communication technologies.
  • RFPAs are utilized in a passive operating region which results in the dissipation of energy as heat or unwanted oscillations.
  • envelope tracking ET is sometimes employed.
  • ET systems use a linear power amplifier and a controlled supply voltage, which closely tracks the output envelope of an input signal. ET provides a method of maintaining a minimum drain voltage marginal, whereby the RFPA transistor may steadily operate in the vicinity of its compression point, thus providing improved efficiency.
  • FIG 1 is an example of a hybrid ET system 100 configured to supply an output to a RFPA 102.
  • the hybrid system 100 may include a linear ET subsystem 104 and an active subsystem 106 interconnected via regulation circuitry 108.
  • the active subsystem 106 is configured to track the envelope of an input signal V E .
  • the active subsystem 106 may have difficulty tracking the input signal V E .
  • the linear subsystem 104 may be utilized to compensate for the active subsystem 106 by supplying a constant voltage above the level of the envelope of the input signal.
  • the linear subsystem may also be utilized to filter noise generated by the active subsystem 106 with use of a feedback system.
  • the operation of the linear 104 and active 106 subsystems may be controlled via the regulation circuitry 108.
  • the regulation circuitry may include a number of devices, for example a number of operational amplifiers connected in parallel to drive a modulation transistor 1 10 of the switching subsystem 106.
  • Hybrids of active and linear ET solutions may offer a combination of high bandwidth and high efficiency.
  • modern hybrid solutions involve the interaction of hybrid parts, or the 'change-of-state' in the control signals to the hybrid parts. These interactions may introduce unwanted communication energies which cause phase or amplitude disturbances. These effects compromise the output impedance and a clean transient step response of the RFPA.
  • active ET solutions typically require large amounts of circuitry to drive the modulation transistor in order to accurately track the envelope of the input signal.
  • example embodiments described herein are directed to a novel RFPA design which combines the desirable parameters of high efficiency and high bandwidth, without compromising the output impedance and transient step response of the RFPA.
  • Example embodiments are also directed towards reducing the amount of circuitry required for driving the active subsystem of switching ET subsystems.
  • the hybrid envelope tracking circuit may include first and second voltage node interfaces that may be configured to receive first and second voltages, respectively.
  • the circuit may further include an input node interface that may be configured to receive an input envelope signal.
  • the circuit may further include an enablement node interface that may be configured to receive an enablement signal, where the voltage control circuit may be configured to transition from a passive or switching operating regime to an active operating regime when the enablement signal is supplied.
  • a modulation transistor may also be included in the voltage control circuit.
  • the modulation transistor may be driven by a single operational amplifier with a floating input and a floating reference point.
  • the modulation transistor may be configured to modulate the second voltage with respect to the envelope signal during the active operating regime.
  • the voltage control circuit may also include an output node interface that may be configured to receive the first voltage during the passive operating regime and the modulated second voltage during the active operating regime.
  • the first voltage may be provided by a constant DC power voltage source with high efficiency.
  • the second voltage may be provided by a variable voltage source with high efficiency.
  • the second voltage may be provided by a constant DC power voltage with high efficiency. Both the first and second voltages may be regulated to adjust a voltage level, thereby increasing efficiency.
  • FIG. 1 is a circuit diagram hybrid envelope tracking system
  • FIG. 2 is a schematic of a hybrid envelope tracking system according to example embodiments
  • FIG. 3 is a circuit diagram of a voltage control circuit included in the system of FIG.
  • FIG. 4 is a flow chart depicting an example of operational steps which may be provided by the system of FIG. 2.
  • FIG. 2 is a hybrid envelope tracking (ET) system 200 capable of providing oscillation free transitions between a switching, active, and/or passive mode of operation, according to example embodiments.
  • the ET system 200 may include a voltage control circuit 204 configured to supply an output voltage 228 to a RFPA 202 via an output node interface 230.
  • the voltage control circuit 204 may be configured to receive an envelope signal 212 and an enablement signal 216 from the input stage 210 via input stage node interfaces 214 and 218, respectively.
  • the enablement signal 216 may provide an indication of when a transition to an active operational mode is required.
  • the enablement signal 216 may be a digital signal.
  • the envelope signal 212 may provide an indication of a transition, therefore eliminating the need of a separate enablement signal.
  • a passive operational mode may be utilized when the incoming envelope signal 212 includes a low bandwidth and low amplitude.
  • the voltage control circuit 204 may be configured to receive a first voltage 224 from a constant DC voltage source 208 via a first voltage node interface 226.
  • the constant DC voltage source 208 may further include an adaptive regulator 209.
  • the adaptive regulator 209 may be configured to receive a level signal 213 from the input power stage 210.
  • the level signal 213 may provide the voltage source 208 an indication of a amplitude level of the envelope signal 212.
  • the regulator 209 may gradually adjust an amplitude level of the supplied first voltage 224.
  • a switching mode of operation may be employed.
  • a transition between a switching a passive operational mode may be indicated, for example, by the envelope signal 212, the level signal 213, the enablement signal 216, or the regulator 209.
  • the voltage control circuit 204 may be configured to receive a second voltage 220 from a switching power supply 206 via a second voltage node interface 222.
  • the switching power supply 206 may be a variable power source or may be a constant power source.
  • the voltage 220 supplied by the switching power supply 206 may be a constant voltage capable of being adjusted to various preconfigured amplitude levels.
  • the amplitude levels of the second voltage 220 may be of a greater value than the amplitude levels of the first voltage 224.
  • the switching power supply 206 may also include a regulator 21 1. Similarly to the regulator 209 included in constant power supply, the regulator 21 1 of the switching power supply 206 may also gradually adjust an amplitude level of the second voltage 220 according to a level signal 213.
  • the regulators 21 1 and 209 may include one or several switches that may connect different voltage outputs from one transformer. Adjustments of the levels of the first and second voltages 224 and 220, respectively, may improve efficiency with different peak to average signals during operational mode transitions.
  • an active operational mode may be employed.
  • the second voltage 220 may be modulated to closely track the envelope of the envelope signal 212.
  • the modulation may be provided with circuitry included in the voltage control circuit 204.
  • An indication that an operational transition to an active mode is required may be provided, for example, by the envelope signal 212, the level signal 213, the enablement signal 216, or regulators 209 and 21 1 .
  • Figure 3 illustrates an example of the circuitry which may be included in the voltage control circuit 204 of the ET system 200.
  • the voltage control circuit 204 may include a modulation transistor 234 driven by an operational amplifier 232.
  • the modulation transistor 234 may be a field effect transistor (FET) or any other known transistor in the art.
  • the operational amplifier may be driven by a floating input 236 and utilize a floating reference.
  • a diode 238 associated with the first voltage source 208 may also be included in the voltage control circuit 204.
  • An interconnection between the modulation transistor 234 and the diode 238 is represented as a summation point (SP).
  • the summation point SP is interconnected to the operational amplifier 232 via a feedback connection.
  • the feedback connection allows the operational amplifier 232 to monitor and adjust the current flowing from the summation point SP to the output node 230, thereby providing a floating reference for the modulation transistor 234.
  • the current adjustment helps reduce oscillations during operational transitions.
  • the ET system 200 may be configured to maintain a low voltage at the output interface node 230 for a majority of its operation in order to reduce power dissipation.
  • the ET system 200 may mainly operate in the passive mode.
  • the voltage 228 supplied to the PA 202 may be provided by the constant DC voltage source 208 and the modulation transistor 234 may be kept in a disabled state.
  • the modulation transistor 234 may stay in a disabled state while the second voltage 220 is supplied to the PA 202.
  • the diode 238 may become disabled as voltage is no longer being supplied by power source 208.
  • the modulation transistor 234 may become enabled while the diode associated with power supply 208 remains disabled. Thereafter, the voltage control circuit 204 may operate in an active mode and vary the output voltage 228 according to the signal amplitude of the envelope signal 212. During the active mode of operation the second voltage 220 may be modulated according to the envelope of the envelope signal 212.
  • the voltage control circuit 204 may continuously adjust the voltage 228 being supplied to the RFPA 202 by transitioning to and from a passive, switching, and/or active mode of operation.
  • the voltage 228 supplied by the voltage control circuit 204 may be provided with the switching power supply 206 (during a switching and/or active operation mode) defining the highest possible output voltage level transmitted to the PA 202, or the constant DC voltage source 208 (during a passive operation mode) defining the lowest possible output voltage level.
  • the maximum output swing of the voltage 228 may be limited by the difference between the voltage outputs of from the two voltage sources 206 and 208.
  • the voltage control circuit 204 may measure the individual current in the diode 238 and the output PA node 230 at the summation point (SP) and minimize oscillations due to energy transfers between the diode 238 and the modulation transistor 234, regardless of any diode parasitics that may be present. It should be appreciated that a second modulation transistor may be placed in parallel with the diode 238. The use of a second modulation transistor may increase efficiency during a time between transitions.
  • FIG. 4 illustrates a sequence of example operational steps which may be taken by the ET system 200 during a transition.
  • the voltage control circuit 204 may be configured to receive an envelope signal 212 via the input node interface 214 (Fig. 4, 402).
  • the voltage control circuit 204 may initially be functioning in a passive operative mode.
  • the modulation transistor 234 may be pre-biased to Class A, or a disabled status, and the constant power supply 208 will provide the output voltage.
  • a passive mode of operation may be best suited for an incoming envelope signal having low signal amplitude and low bandwidth. Therefore, there is no need for peak power feeding and the voltage 224 supplied by the constant power source 208 may be slowly adjusted as needed via the regulator 209.
  • level signals 213 may continuously, or at predetermined times, supply information to power sources 206 and 208 for regulation of voltage levels via the regulators 209 and 21 1 (Fig. 4, 403).
  • the first voltage 224 may be sent to the output node 230 as the output voltage 228 to the PA 202 (Fig. 4, 404).
  • the constant voltage supply 208 is not sufficient for providing the amplitude demands of the incoming envelope signal 212, a transition to the switching operational mode may be made. In the transition between the switching and passive operational modes, the diode becomes disabled and the modulation transistor remains disabled. The output voltage is supplied by the second voltage supply 206 (Fig. 4, 404).
  • the enablement signal When a transition into an active operating region is desired, the enablement signal
  • the input stage 210 may be configured to change the ground reference of the input envelope signal 212 to the virtual ground level at the summation point SP.
  • Changing the ground reference of the input envelope signal eliminates the need for additional circuit elements, such as inductors or capacitors, in order to further reduce oscillations during operational transitions.
  • altering the ground reference of the input envelope signal lessens the amount of power consumption needed by lowering the amplitude of the input signal. Lowering the amplitude of the input envelope signal decreases the frequency at which the voltage control circuit 204 may need to operate.
  • the enablement signal 216 may thereafter be supplied to the floating input 236 of the operational amplifier 232 used to drive the modulation transistor 234 (Fig. 4, 408).
  • the presence of the enablement signal 216 may induce a change in the modulation transistor 234 resulting in a Class D setting, or an enabled status. It should be appreciated that the enablement of the modulation transistor 234 may occur prior to the actual modulation in order provide a smoother transition with reduced oscillations.
  • a small constant current may be supplied to the modulation transistor 234 via the operational amplifier 232.
  • the operational amplifier 232 may ensure that the current is held constant by taking in voltage over the series resisters within the floating input and balancing the current against the applied enablement signal. This allows the low signal amplitude (or a passive mode of operation) to continue to vary unhindered by the operational transition taking place.
  • a constant smaller current is sent to the RFPA via the modulation transistor 234, while larger and varying currents may come via the diode 238.
  • the peak amplitude may be mirrored through the enablement signal interface 218, as well as an indication of the amount of current needed for the modulation transistor 234 to provide the required amount of modulation.
  • the operational amplifier 232 may be configured to provide the modulation transistor 234 a small amount of current over what is needed.
  • the time for the actual active mode transition may be indicated in a demand signal embedded in the enablement signal.
  • the operational amplifier 232 may compare the demand value with the feedback value (via the summation point) from the series resistors in the floating input. The operational amplifier 232 in time will realize that the current being supplied by the constant source 208, or switching source 206, is not enough. In turn, the operational amplifier 232 will increase the voltage supplied to the gate 'G' of the modulation transistor 234, thereby establishing the active mode. Once the active mode has been established, the voltage at the summation point (SP) will be defined higher than what the RFPA requires.
  • the operational amplifier 232 which is emitter coupled, may use all of its bandwidth to control the modulation transistor 234. Therefore, it is only the modulation transistor 234 that is limiting.
  • the voltage control circuit 204 may vary the output voltage 228 by modulating the second voltage 220 according to the envelope of the envelope input signal 212 via the modulation transistor 234 (Fig. 4, 410).
  • the second voltage 220 may be adjusted via regulator 21 1 as indicated by level signal 213. It should be appreciated that the second voltage 220 need not be regulated since the modulating transistor 234 handles the current regulation for the voltage control circuit 204.
  • the modulated voltage may be provided as the output voltage 228 to the RFPA (Fig. 4, 412). Once the enablement signal 216 has been released, the voltage control circuit may transition back to a passive or switched mode of operation (Fig. 4, 414). It should be appreciated that operational transitions may occur to and from any of the three operational modes.
  • an external feedback system may be included in the ET system 200 in order to improve over-all linearity of the system.
  • the components of the ET system 200 may be cascaded to from a voltage ladder of low voltage blocks delivering highly efficient switching. Each voltage block may comprise a very low active voltage swing in both Classes A and D.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

Cette invention se rapporte à un système de suivi d'enveloppe hybride capable d'effectuer une transition entre un mode de fonctionnement passif, de commutation et/ou actif avec des oscillations parasites réduites au minimum. Le système peut comprendre un circuit de commande de tension qui comprend des première et seconde interfaces de nœud configurées de façon à recevoir respectivement des première et seconde tensions. Une interface de nœud d'entrée peut être configurée de façon à recevoir un signal d'enveloppe d'entrée. Une interférence de nœud d'autorisation peut être configurée de façon à recevoir un signal d'autorisation, le signal d'autorisation établissant une transition entre un mode de fonctionnement passif ou de commutation vers un mode de fonctionnement actif. Le circuit peut comprendre en outre un transistor de modulation commandé par un seul amplificateur opérationnel flottant. Le transistor de modulation peut être utilisé de façon à moduler une tension fournie par rapport à un signal d'enveloppe reçu au cours du régime de fonctionnement actif.
PCT/SE2010/050292 2010-03-16 2010-03-16 Hybride de commutation de suivi d'enveloppe Ceased WO2011115533A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2010/050292 WO2011115533A1 (fr) 2010-03-16 2010-03-16 Hybride de commutation de suivi d'enveloppe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2010/050292 WO2011115533A1 (fr) 2010-03-16 2010-03-16 Hybride de commutation de suivi d'enveloppe

Publications (1)

Publication Number Publication Date
WO2011115533A1 true WO2011115533A1 (fr) 2011-09-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2704319A1 (fr) * 2012-08-28 2014-03-05 Samsung Electronics Co., Ltd Dispositif audio et son procédé de sortie
US8818305B1 (en) 2012-11-14 2014-08-26 Motorola Mobility Llc Supply transitions in an envelope tracked power amplifier
WO2014118344A3 (fr) * 2013-02-01 2014-11-27 Nujira Limited Modes basse puissance pour modulateur de suivi d'enveloppe 3g/4g

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060001483A1 (en) * 2001-08-29 2006-01-05 Tropian, Inc. Power supply processing for power amplifiers
US20060192536A1 (en) * 2005-02-28 2006-08-31 Chen Jau H DC-DC converter for power level tracking power amplifiers
US20080157895A1 (en) * 2006-12-29 2008-07-03 Nokia Corporation Multi-mode amplitude modulator control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060001483A1 (en) * 2001-08-29 2006-01-05 Tropian, Inc. Power supply processing for power amplifiers
US20060192536A1 (en) * 2005-02-28 2006-08-31 Chen Jau H DC-DC converter for power level tracking power amplifiers
US20080157895A1 (en) * 2006-12-29 2008-07-03 Nokia Corporation Multi-mode amplitude modulator control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2704319A1 (fr) * 2012-08-28 2014-03-05 Samsung Electronics Co., Ltd Dispositif audio et son procédé de sortie
US9484876B2 (en) 2012-08-28 2016-11-01 Samsung Electronics Co., Ltd. Control of a switched mode power supply and linear power supply for an audio device
US8818305B1 (en) 2012-11-14 2014-08-26 Motorola Mobility Llc Supply transitions in an envelope tracked power amplifier
WO2014118344A3 (fr) * 2013-02-01 2014-11-27 Nujira Limited Modes basse puissance pour modulateur de suivi d'enveloppe 3g/4g

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