WO2008014210A1 - Power management scheme for software-defined radios - Google Patents
Power management scheme for software-defined radios Download PDFInfo
- Publication number
- WO2008014210A1 WO2008014210A1 PCT/US2007/074105 US2007074105W WO2008014210A1 WO 2008014210 A1 WO2008014210 A1 WO 2008014210A1 US 2007074105 W US2007074105 W US 2007074105W WO 2008014210 A1 WO2008014210 A1 WO 2008014210A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- waveform
- power supply
- drain voltage
- power amplifier
- Prior art date
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000003466 anti-cipated effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
-
- 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
-
- 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
-
- 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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0433—Circuits with power amplifiers with linearisation using feedback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
Definitions
- the present disclosure relates to software-defined radios and, more particularly, to a method and system for managing power consumption in software- defined radios.
- a software-defined radio is a radio communication system whose channel waveforms are defined in software. That is, waveforms are generated as sampled digital signals, converted from digital to analog via a wideband Digital to Analog Converter (DAC) and then possibly upconverted from IF to RF. Likewise, the receiver employs a wideband Analog to Digital Converter (ADC) that captures all of the channels of the software radio node. The receiver then extracts, downconverts and demodulates the channel waveform using software on a general purpose processor.
- ADC Analog to Digital Converter
- the amplifier powering the antenna needs to handle a variety of antenna load impedances.
- the amplifier is typically designed to accommodate all of the anticipated load impedances. In other words, the amplifier is designed to meet the worst case scenario, thereby resulting in sub-optimum efficiency when the load impedance is good. Therefore, it is desirable to adjust the operating parameters of the amplifier to match the load impedances, thereby improving amplifier efficiency and reducing power consumption.
- a power management system is provided for a software-defined radio.
- the power management system includes: an antenna; a regulated power supply; a power amplifier; and a digital signal processor.
- a software-implemented power supply calculator and power supply adjuster are operable within the digital signal processor.
- the power supply calculator receives an indicator of a type of waveform to be transmitted by the radio and determines the drain voltage for the power amplifier based on the waveform indicator.
- the power supply adjuster receives forward power and reflected power values from the antenna and computes a voltage standing wave ratio (VSWR). The power supply adjuster further computes an adjustment for the drain voltage based on the VSWR. Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- Figure 1 is a block diagram of an exemplary transmit subsystem for a software-defined radio
- Figures 2A and 2B are schematics of an exemplary amplifier design and an exemplary power supply design, respectively, which may be used in the transmit subsystem of a radio;
- Figures 3 A and 3B depict exemplary tables of drain voltages and power supply control voltages, respectively, which may be used as initial power settings for a radio amplifier;
- Figure 4 depicts an exemplary table of bias currents which may be used as initial power setting for a radio amplifier
- Figure 5 is a block diagram of an exemplary transmit subsystem having three different amplifiers.
- FIG. 1 depicts an exemplary transmit subsystem 10 for a software- defined radio.
- the transmit subsystem 10 is generally comprised of a regulated power supply 12, a power amplifier 14 operably coupled via a directional coupler 16 to an antenna 18, and a digital signal processor 20. While the following description is provided with reference to a software-defined radio, the broader aspects of this disclosure are applicable to other types of radio implementations.
- the power amplifier 14 receives an RF transmit signal and amplifies the transmit signal in accordance with an input signal from the power supply 12.
- the amplified RF signal passes through the directional coupler 16 prior to being output to the antenna 18.
- the directional coupler 16 is operable to detect an amount of signal power output to the antenna 18 (referred to herein as forward power) and to detect an amount of signal power reflected by the antenna 18 (referred to herein as reflected power). Forward power and reflected power values are in turn input to the digital signal processor for subsequent processing.
- the signal amplification properties correlate to the drain voltage applied to the power amplifier 14.
- the power supply 12 outputs the drain voltage to the power amplifier 14.
- the drain voltage output by the power supply 12 is in turn regulated by a control signal from the digital signal processor 20.
- the digital signal processor 20 can control the drain voltage applied to the power amplifier 14 and thus control the amplification of the RF transmit signal.
- Figures 2A and 2B illustrate an exemplary amplifier design and an exemplary power supply design, respectively, which may be used in the transmit subsystem of a radio. It is readily understood that other designs are contemplated by this disclosure.
- the digital signal processor 20 employs two software modules: a power supply calculator 22 and a power supply adjuster 24.
- the power supply calculator 22 computes an initial power setting for the power amplifier 14. This initial power setting may be a function of various parameters including but not limited to the type of waveform to be transmitted, the transmission frequency for the waveform, an operational characteristic of the amplifier and combinations thereof. These various parameters are input to the power supply calculator 22 from other software components of the radio. The power supply control voltage and/or the drain voltage are then computed by the power supply calculator 22.
- the drain voltage is determined from an empirically derived table 31 as shown in Figure 3 A. Given the type of waveform and the transmission frequency for the waveform, a suitable drain voltage is read from the table during waveform instantiation.
- the power amplifier 14 may operate in either a linear mode or an efficient mode, where mode selection is dependant upon the waveform being transmitted as in known in the art. For instance, the amplifier is operated in a linear mode for high peak-to-average ratio waveform as opposed to being operated in an efficient mode for constant envelope waveforms. An amplifier operating in a linear mode tends to have a higher drain voltage than an amplifier operating in the efficient mode. Likewise, a waveform having a high transmission frequency tends to have a higher drain voltage than a waveform having a lower transmission frequency.
- a secondary conversion function or table may be referenced to convert the drain voltage to a corresponding control voltage for the adjustable power supply 14.
- the power supply calculator 22 may use the input parameters to reference an empirically derived table of control voltages as shown in Figure 3B.
- the RF signal is transmitted with the power amplifier set at this initial power setting.
- the initial power setting may be computed using one or more empirically derived equations.
- a first level of efficiency is achieved by tailoring the power setting to the characteristics of the transmit signal.
- the power supply adjuster 24 subsequently adjusts the power setting based on a measured power efficiency at the antenna.
- the power supply adjustor 24 is adapted to receive forward power and reflected power values from the directional coupler 16. Based on these power values, the power supply adjustor 24 is able to compute a voltage standing wave ratio (VSWR) and adjust power output by the power amplifier 14 to the antenna 18 as a function of the VSWR. In this way, operating efficiency of the power amplifier is improved, thereby further reducing the power consumption of the radio.
- VSWR voltage standing wave ratio
- the power supply adjustor 24 may adjust the drain voltage being applied to the power amplifier 14. To do so, the power supply adjustor 24 computes a multiplier for the initial power setting.
- the drain voltage is reduced as a function of the VSWR according to: square root of ((calculated VSWR)/(the highest anticipated value of VSWR)). Assuming the highest anticipated VSWR is three, example calculations using this equation are shown as follows:
- the power supply calculator 22 receives the multiplier from the power supply adjuster 24 and adjusts the power setting accordingly. For a measured VSWR of one, the drain voltage is reduced by about sixty percent, thereby improving the operating efficiency of the amplifier and reducing power consumption.
- the power supply adjustor 24 may employ different functions for different types of waveforms. Upon computing the VSWR, the power supply adjustor 24 selects one of two or more adjustment functions based on the waveform being transmitted. For instance, a first adjustment function is used to adjust the drain voltage for a first type of waveform; whereas, a second different adjustment function is used to adjust the drain voltage for a second type of waveform. In this way, an adjustment functions may be specifically tailored to the characteristics of the waveform.
- the signal power output by power amplifier 14 may also be controlled through the bias current for the power amplifier 14.
- the bias current is supplied to the power amplifier 14 by the power supply 12.
- the bias current output by the power supply 12 may be regulated by a control signal from the digital signal processor 20.
- the power supply calculator 22 can also determine an initial bias current setting for the amplifier 14 in a similar manner as described above.
- the bias current may be determined from an empirically derived table 40 as shown in Figure 4. Given the type of waveform and the transmission frequency for the waveform, a suitable bias current is read from the table during waveform instantiation. The RF signal is transmitted with the power amplifier set at this initial bias current.
- the power supply adjuster 24 may subsequently adjust the bias current based on a measured power efficiency at the antenna. To do so, the power supply adjustor 24 determines a multiplier for the initial bias current setting. Again, the bias current is adjusted as a function of VSWR. In an exemplary embodiment, multipliers for different VSWR are empirically derived for each amplifier and then stored in a table as shown below:
- the power supply calculator 22 receives the multiplier from the power supply adjustor 24 and adjusts the power setting accordingly.
- power output by the amplifier may be controlled by either the drain voltage or the bias current, it is preferably controlled through adjustments to both parameters.
- FIG. 5 illustrates an exemplary configuration for the transmit subsystem 50 having three different amplifiers: a low band amplifier 52, a high band amplifier 54 and an amplifier configured for satellite communications 56 (commonly referred to as a SATCOM amplifier).
- a low band amplifier 52 a high band amplifier 54
- an amplifier configured for satellite communications 56 commonly referred to as a SATCOM amplifier.
- One of the amplifiers is selectively coupled to the antenna during signal transmission. Selection of the amplifier is dependent upon the waveform being transmitted as is known in the art. For example, a SINCGARS waveform will typically use the low band power amplifier. In contrast, high-data rate waveform will typically use a high band power amplifier.
- the power supply calculator 22 begins by selecting the appropriate amplifier based on the waveform being transmitted. An initial power setting for the selected amplifier is then computed by the power supply calculator 22.
- the drain voltage and/or bias current are read from an empirically derived table as described above. However, a different table is derived for each of the different amplifiers. The tables are preferably stored with each amplifier, but may be centrally stored on the digital signal processor. Otherwise, the initial power setting is selected and implemented as described above.
- the power supply adjuster 24 may employ a different adjustment function for each amplifier. In other words, a first adjustment function is used for the low band amplifier; whereas, a second adjustment function is used for the high band amplifier. The power supply adjustor 24 selects the applicable adjustment function based on the amplifier being used to transmit the signal. The power supply adjustor 24 then computes an adjustment for the power setting using the selected function. In this way, an adjustment functions may be specifically tailored to the characteristics of the amplifier.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009521928A JP2009545250A (en) | 2006-07-27 | 2007-07-23 | Power management techniques for software-defined radios |
EP07813222A EP2070195B1 (en) | 2006-07-27 | 2007-07-23 | Power management scheme for software-defined radios |
AT07813222T ATE455398T1 (en) | 2006-07-27 | 2007-07-23 | POWER MANAGEMENT SCHEME FOR SOFTWARE DEFINED RADIOS |
DE602007004352T DE602007004352D1 (en) | 2006-07-27 | 2007-07-23 | PERFORMANCE MANAGEMENT SCHEME FOR SOFTWARE-DEFINED RADIOS |
IL196686A IL196686A (en) | 2006-07-27 | 2009-01-22 | Power management scheme for software-defined radios |
NO20090784A NO20090784L (en) | 2006-07-27 | 2009-02-18 | Power management scheme for software-defined radio |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/494,287 | 2006-07-27 | ||
US11/494,287 US7590395B2 (en) | 2006-07-27 | 2006-07-27 | Power management scheme for software-defined radios |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008014210A1 true WO2008014210A1 (en) | 2008-01-31 |
Family
ID=38740164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/074105 WO2008014210A1 (en) | 2006-07-27 | 2007-07-23 | Power management scheme for software-defined radios |
Country Status (10)
Country | Link |
---|---|
US (1) | US7590395B2 (en) |
EP (1) | EP2070195B1 (en) |
JP (1) | JP2009545250A (en) |
KR (1) | KR20090037476A (en) |
AT (1) | ATE455398T1 (en) |
DE (1) | DE602007004352D1 (en) |
IL (1) | IL196686A (en) |
NO (1) | NO20090784L (en) |
TW (1) | TW200818746A (en) |
WO (1) | WO2008014210A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101344557B (en) * | 2008-09-04 | 2010-09-15 | 北京航空航天大学 | Radiation sensitivity test method of protection power amplifier |
EP2514711A1 (en) | 2011-04-18 | 2012-10-24 | Anheuser-Busch InBev S.A. | Liquid dispensing appliance comprising a solid gas-adsorbent |
EP2562129A1 (en) | 2011-08-23 | 2013-02-27 | Anheuser-Busch InBev S.A. | Roving beverage dispensing unit |
EP2660188A1 (en) | 2012-05-02 | 2013-11-06 | Anheuser-Busch InBev S.A. | Beverage dispensing unit with openable pinch valve |
US9473072B2 (en) | 2014-02-03 | 2016-10-18 | Fujitsu Limited | Amplification device and amplification method |
US9831900B2 (en) | 2015-05-01 | 2017-11-28 | Fujitsu Limited | Wireless communication device |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7787834B2 (en) * | 2007-02-08 | 2010-08-31 | Broadcom Corporation | Voice, data and RF integrated circuit with off-chip power amplifier and methods for use therewith |
US7937120B2 (en) * | 2007-04-21 | 2011-05-03 | Paratek Microwave, Inc. | System, apparatus and method for frequency based current reduction in wireless portable devices |
US8548399B2 (en) * | 2007-06-21 | 2013-10-01 | Telefonaktiebolaget L M Ericsson (Publ) | Adaptive antenna transmission and antenna calibration |
WO2009003087A2 (en) * | 2007-06-26 | 2008-12-31 | Skyworks Solutions, Inc. | Error vector magnitude control within a linear transmitter |
US8107903B2 (en) * | 2008-11-07 | 2012-01-31 | Triquint Semiconductor, Inc. | Radio frequency amplification circuit utilizing variable voltage generator |
TW201037986A (en) * | 2009-04-08 | 2010-10-16 | Ralink Technology Corp | Power budget controller and related method for Ethernet device |
US20100309901A1 (en) * | 2009-06-03 | 2010-12-09 | Harris Corporation | Systems and methods for maintaining a controlled power output at an antenna port over a range of frequencies defined by two or more frequency bands |
US9203489B2 (en) | 2010-05-05 | 2015-12-01 | Google Technology Holdings LLC | Method and precoder information feedback in multi-antenna wireless communication systems |
US8364104B2 (en) * | 2010-09-24 | 2013-01-29 | Intel Corporation | Power calibration under voltage standing wave ratio change by frequency sweep |
KR101616607B1 (en) * | 2011-05-30 | 2016-04-28 | 닛본 덴끼 가부시끼가이샤 | Vswr measurement circuit, wireless communication device, vswr measurement method and recording medium in which vswr measurement program is stored |
KR101294434B1 (en) * | 2011-07-28 | 2013-08-07 | 엘지이노텍 주식회사 | Impedance matching apparatus and impedance matching method |
US9813262B2 (en) | 2012-12-03 | 2017-11-07 | Google Technology Holdings LLC | Method and apparatus for selectively transmitting data using spatial diversity |
US9189953B2 (en) * | 2012-12-17 | 2015-11-17 | Itron, Inc. | RF dynamic power control and radio protection in metering devices |
US9591508B2 (en) | 2012-12-20 | 2017-03-07 | Google Technology Holdings LLC | Methods and apparatus for transmitting data between different peer-to-peer communication groups |
US9979531B2 (en) | 2013-01-03 | 2018-05-22 | Google Technology Holdings LLC | Method and apparatus for tuning a communication device for multi band operation |
US10229697B2 (en) | 2013-03-12 | 2019-03-12 | Google Technology Holdings LLC | Apparatus and method for beamforming to obtain voice and noise signals |
US9197255B2 (en) * | 2013-09-12 | 2015-11-24 | Broadcom Corporation | RF transmitter with average power tracking and methods for use therewith |
US9386542B2 (en) | 2013-09-19 | 2016-07-05 | Google Technology Holdings, LLC | Method and apparatus for estimating transmit power of a wireless device |
US9549290B2 (en) | 2013-12-19 | 2017-01-17 | Google Technology Holdings LLC | Method and apparatus for determining direction information for a wireless device |
US9491007B2 (en) | 2014-04-28 | 2016-11-08 | Google Technology Holdings LLC | Apparatus and method for antenna matching |
US9478847B2 (en) | 2014-06-02 | 2016-10-25 | Google Technology Holdings LLC | Antenna system and method of assembly for a wearable electronic device |
US20200044612A1 (en) * | 2018-07-31 | 2020-02-06 | Advanced Micro Devices, Inc. | Transmitter dynamic rf power control via vswr detection for wireless radios |
CN110290577B (en) * | 2019-07-15 | 2022-06-07 | Oppo(重庆)智能科技有限公司 | Power compensation method, antenna assembly and electronic equipment |
US10944436B1 (en) | 2019-11-21 | 2021-03-09 | Harris Global Communications, Inc. | RF communication device using artificial intelligence (AI) model and associated methods |
US20230088109A1 (en) * | 2021-09-22 | 2023-03-23 | Skyworks Solutions, Inc. | Power amplifier having adaptive array size |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4547746A (en) * | 1984-04-09 | 1985-10-15 | Rockwell International Corporation | VSWR Tolerant linear power amplifier |
WO1998047222A1 (en) * | 1997-04-17 | 1998-10-22 | Qualcomm Incorporated | An amplifier circuit having a high linearity mode of operation and a high efficiency mode of operation |
US6362690B1 (en) * | 2000-04-19 | 2002-03-26 | Ophir Rf, Inc. | System and method for closed loop VSWR correction and tuning in RF power amplifiers |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5126688A (en) * | 1990-03-20 | 1992-06-30 | Oki Electric Co., Ltd. | Power amplifying apparatus for wireless transmitter |
US5081425A (en) * | 1990-05-24 | 1992-01-14 | E-Systems, Inc. | Vswr adaptive power amplifier system |
JP3348196B2 (en) * | 1998-03-06 | 2002-11-20 | 独立行政法人通信総合研究所 | Wireless transmission system |
JP2000022559A (en) * | 1998-07-03 | 2000-01-21 | Nec Corp | Transmission output control circuit |
US6438360B1 (en) * | 1999-07-22 | 2002-08-20 | Motorola, Inc. | Amplifier system with load control to produce an amplitude envelope |
US6639471B2 (en) * | 2001-04-16 | 2003-10-28 | Matsushita Electric Industrial Co., Ltd. | Power amplifier circuit, control method for power amplifier circuit, and portable terminal apparatus for mobile communication |
US6614309B1 (en) * | 2002-02-21 | 2003-09-02 | Ericsson Inc. | Dynamic bias controller for power amplifier circuits |
US20050227646A1 (en) * | 2004-03-18 | 2005-10-13 | Ryo Yamazaki | Detecting and maintaining linearity in a power amplifier system through comparing peak and RMS power levels |
DE102004017528A1 (en) * | 2004-04-08 | 2005-11-03 | Infineon Technologies Ag | Transmission arrangement and method for operating an amplifier in a transmission arrangement |
US7109897B1 (en) * | 2005-10-07 | 2006-09-19 | Rf Micro Devices, Inc. | Power amplifier control reducing output power variation |
-
2006
- 2006-07-27 US US11/494,287 patent/US7590395B2/en not_active Expired - Fee Related
-
2007
- 2007-07-23 JP JP2009521928A patent/JP2009545250A/en not_active Withdrawn
- 2007-07-23 WO PCT/US2007/074105 patent/WO2008014210A1/en active Application Filing
- 2007-07-23 EP EP07813222A patent/EP2070195B1/en not_active Not-in-force
- 2007-07-23 KR KR1020097003645A patent/KR20090037476A/en not_active Application Discontinuation
- 2007-07-23 DE DE602007004352T patent/DE602007004352D1/en active Active
- 2007-07-23 AT AT07813222T patent/ATE455398T1/en not_active IP Right Cessation
- 2007-07-26 TW TW096127337A patent/TW200818746A/en unknown
-
2009
- 2009-01-22 IL IL196686A patent/IL196686A/en not_active IP Right Cessation
- 2009-02-18 NO NO20090784A patent/NO20090784L/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4547746A (en) * | 1984-04-09 | 1985-10-15 | Rockwell International Corporation | VSWR Tolerant linear power amplifier |
WO1998047222A1 (en) * | 1997-04-17 | 1998-10-22 | Qualcomm Incorporated | An amplifier circuit having a high linearity mode of operation and a high efficiency mode of operation |
US6362690B1 (en) * | 2000-04-19 | 2002-03-26 | Ophir Rf, Inc. | System and method for closed loop VSWR correction and tuning in RF power amplifiers |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101344557B (en) * | 2008-09-04 | 2010-09-15 | 北京航空航天大学 | Radiation sensitivity test method of protection power amplifier |
EP2514711A1 (en) | 2011-04-18 | 2012-10-24 | Anheuser-Busch InBev S.A. | Liquid dispensing appliance comprising a solid gas-adsorbent |
WO2012143352A1 (en) | 2011-04-18 | 2012-10-26 | Anheuser-Busch Inbev S.A. | Liquid dispensing appliance comprising a solid gas-adsorbent |
EP2562129A1 (en) | 2011-08-23 | 2013-02-27 | Anheuser-Busch InBev S.A. | Roving beverage dispensing unit |
WO2013026703A1 (en) | 2011-08-23 | 2013-02-28 | Anheuser-Busch Inbev S.A. | Roving beverage dispensing unit |
US11753290B2 (en) | 2011-08-23 | 2023-09-12 | Anheuser-Busch Inbev S.A. | Roving beverage dispensing unit |
EP2660188A1 (en) | 2012-05-02 | 2013-11-06 | Anheuser-Busch InBev S.A. | Beverage dispensing unit with openable pinch valve |
WO2013164258A1 (en) | 2012-05-02 | 2013-11-07 | Anheuser-Busch Inbev Sa | Beverage dispensing unit with openable pinch valve |
US9580289B2 (en) | 2012-05-02 | 2017-02-28 | Anheuser-Busch Inbev S.A. | Beverage dispensing unit with openable pinch valve |
US9473072B2 (en) | 2014-02-03 | 2016-10-18 | Fujitsu Limited | Amplification device and amplification method |
US9831900B2 (en) | 2015-05-01 | 2017-11-28 | Fujitsu Limited | Wireless communication device |
Also Published As
Publication number | Publication date |
---|---|
TW200818746A (en) | 2008-04-16 |
ATE455398T1 (en) | 2010-01-15 |
EP2070195A1 (en) | 2009-06-17 |
US20080026710A1 (en) | 2008-01-31 |
EP2070195B1 (en) | 2010-01-13 |
DE602007004352D1 (en) | 2010-03-04 |
IL196686A (en) | 2012-06-28 |
IL196686A0 (en) | 2009-11-18 |
NO20090784L (en) | 2009-04-27 |
KR20090037476A (en) | 2009-04-15 |
US7590395B2 (en) | 2009-09-15 |
JP2009545250A (en) | 2009-12-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7590395B2 (en) | Power management scheme for software-defined radios | |
US8208876B2 (en) | Amplifier compression controller circuit | |
EP1984978B1 (en) | Amplifier compression controller circuit | |
US7551689B2 (en) | Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios | |
US8014735B2 (en) | RF power amplifier controlled by estimated distortion level of output signal of power amplifier | |
US8013674B2 (en) | Amplifier compression adjustment circuit | |
US8400217B2 (en) | RF power amplifier circuit with mismatch tolerance | |
US6166598A (en) | Power amplifying circuit with supply adjust to control adjacent and alternate channel power | |
EP1569330B1 (en) | Method and apparatus for improving power amplifier efficience in wireless communication systems having high peak to average power ratios | |
US6563883B1 (en) | Transmitter | |
JP3979237B2 (en) | Wireless communication device and high-frequency integrated circuit used therefor | |
US7593699B2 (en) | Distortion/efficiency adaptation in a variable-data-rate radio transmitter | |
CN213521813U (en) | System for adjusting power amplifier supply voltage based on transmitter branch gain setting | |
JP2004007083A (en) | Transmission apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07813222 Country of ref document: EP Kind code of ref document: A1 |
|
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2009521928 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007813222 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020097003645 Country of ref document: KR |
|
NENP | Non-entry into the national phase |
Ref country code: RU |