CN1732627A - 多模发射机 - Google Patents
多模发射机 Download PDFInfo
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- 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
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Amplifiers (AREA)
Abstract
本发明公开一种系统与方法,其用于提供高效率的线性发射机,其与有能力操作在多种模式之一的无线设备兼容。在正常操作模式中,射频功率放大器(RFPA 112)运行在包络跟踪模式。相应地,RFPA供应电压跟踪线性调制的包络。在另一可供选择的操作模式中,供应调制器(102)被锁到固定的DC电压。通过使用单个灵活的DC-DC转换器以供应到RFPA,在正常模式与替代模式中均维持了高效率水平。转换器输入电压随操作模式而切换。
Description
技术领域
一般地,本发明涉及通信系统,更具体地,涉及一种系统与方法,其用于增加具有多种操作模式的发射机中的操作效率。
背景技术
对移动与个人通信服务的日益增长的需要恢复了对高频谱效率的调制方法的兴趣。另外,对有能力进行多种调制以提供更大的网络兼容性的移动站(例如蜂窝电话)的需要也在增加。例如,除了本地(native)iDEN操作模式之外,可从Illinois州Schaumburg的Motorola公司获得的iDEN网络兼容的特定型号的移动站提供了称为Talkaround的操作模式。
Talkaround是绕过转发器通话的方法,以允许第一移动站与第二移动站通信并与第二移动站直接连接,而无须经过网络或转发器。这允许彼此接近的站彼此通话而无需占用转发器,或者如果转发器出故障的话。
普遍承认,用于线性调制移动系统的理想放大器是线性放大器,其也是节能的。线性发射机是众所周知的。为在这样的设备中获取线性与效率两者,可在功率放大器中采用线性化技术,例如笛卡尔(Cartesian)反馈回路。笛卡尔反馈回路是闭环负反馈技术,其在放大并上变频到输出频率与功率水平之前,将基带反馈信号加到正交分量信号(例如,同相(I)与正交(Q)信号)。基带正交调制的笛卡尔反馈提供削减的调制间失真以及低复杂度与成本。上面描述的系统与方法提供笛卡尔反馈回路中的RFPA的训练方法,其中在训练期间将供应调制器锁到固定的DC电压。该训练概念在编号6,353,359的题为“Training Scheme for High Efficiency Amplifier”的美国专利中更详细地描述,该专利颁发给本发明的发明人,并通过引用集成于此。
然而,尚未出现用于线性和/或恒定包络操作的多模操作,例如用在具有正常与Talkaround两种操作模式的移动系统中的操作。
附图说明
图1是遵照本发明的实施例的发射机的功能示意框表示;
图2是处于第一操作模式的发射机的RFPA供应电压波形的图示;和
图3是处于第二操作模式的发射机的RFPA供应电压波形的图示。
具体实施方式
这里描述的新的双模发射机涉及一种系统与方法,其用于提供高效率的线性发射机,其与多模移动站(MS)兼容。在正常操作模式(例如iDEN模式)中,射频功率放大器(RFPA)运行在包络跟踪模式。相应地,RFPA供应电压跟踪线性调制的包络。在另一可供选择的操作模式(例如Talkaround)中,供应调制器被锁到固定的DC电压。可以分立地或使用芯片组来实现双模发射机。
通过使用单个灵活的DC-DC转换器作为供应调制器以供应到RFPA,在正常模式与替代模式中均维持了高效率水平。转换器输入电压随操作模式而切换。例如,在示例性实施例中,在上面讨论的正常iDEN操作模式中,使用包络的带宽受限的近似。在替代的Talkaround模式中,使用固定的DC电压。
这里描述的本多模发射机系统与方法的一个特别的优点是在所有操作模式(包括iDEN与Talkaround模式)中实现效率的增加和热耗散的削减。
图1阐释遵照本发明的一个方面的线性发射机。可采用数字信号处理器(未显示)来向可变衰减器组件104提供输入信号。输入信号可以是具有正交分量(例如,同相与正交信号分量)的复数字基带信号。衰减器组件104提供衰减的参考信号,其连接到相加点106。相加点106将参考信号与自第一基带放大器118输出的下混频器信号相加或组合,以提供误差信号,作为到第二基带放大器108的输入。第二基带放大器108向误差信号提供增益,以输入到IQ上混频器110。IQ上混频器110将误差信号转换到所要求的射频(RF)以供发送,如本地振荡器(LO)的频率所决定的那样。其后,将信号作为输入提供给RF功率放大器112,该放大器又提供RF输出信号。
提供负反馈修正回路,以确保发射机100的线性操作。尽管图1的当前示例阐释笛卡尔反馈回路,可以采用其它反馈回路,例如IF反馈与RF反馈回路。需要理解的是,可采用任何可通过训练促进的反馈修正,以实现本发明。负反馈修正回路包括IQ下混频器116与第一基带放大器118,其连接到相加点106。
线性发射机也包括训练模式,以提供关于输入训练信号的反馈信号的相位调整,以及功率放大器的最大剪切水平的确定。使用相移组件114来设定回路相位。也向衰减器104提供幅度训练。连同训练波形一起提供衰减调整与相移调整。简言之,在训练期间,系统采用训练方法,其用于具有调制器组件以调制RF功率放大器的供应电压的线性放大器系统。将供应调制器锁到或设定到RF功率放大器的最大或峰值供应电压,其对应于RF功率放大器的最大饱和点。进入训练模式,其中提供输入信号,并确定RF功率放大器的衰减调整水平。在正常操作中采用相位调整与衰减调整。
训练波形方法的更详细的描述可在编号5,066,923,颁发给Gailus等,题为“a Linear Transmitter Training Method and Apparatus”的美国专利中找到,其通过引用集成与此。另一训练方法阐释在编号5,748,038,颁发给Boscovic等,题为“a Method for Amplifier Training ina Linear Power Amplifier”的美国专利中,其也通过引用集成与此。
提供调制器组件102,以调制RF功率放大器112的操作点。调制器组件102优选地为单个灵活的DC-DC转换器,并提供RF功率放大器112的供应电压的调制。当无线设备操作在正常或iDEN操作模式中时,调制器组件102接收包络信号R(t),其表示RF输入信号(I与Q)的包络F(env(t))的函数。作为可供选择的另一替代方案,当无线设备操作在Talkaround操作模式中时,调制器组件102接收包络信号R(t),其表示固定的DC信号。这样,遵照RF信号的包络调制RFPA供应,以便操作RFPA更接近其压缩点,以改善效率。
在正常或iDEN操作模式中,比如说,包络的函数可以是常数“K”乘以实际包络信号“R(t)”,或其带宽受限的版本,以向调制器102提供输入信号。调制器组件102其后采用包络信号R(t)以向RF功率放大器112提供优化的供应电压,以得到想要的RF输出包络水平。RF功率放大器112的供应电压由数字信号处理器(DSP)等(未显示)驱动的调制器组件102调制。这样,DSP可操作以将RF功率放大器的操作优化到给定的所要求的瞬时输出功率,其最有效率的点。在线性发射机100的正常操作期间,供应调制器部分调制施加到RF功率放大器的电压,以便以最大效率操作。
将输入信号(I与Q)输入到衰减器组件104中。包络R(t)也是输入信号(I与Q)的函数。因此,当输入信号在幅度上调制和变化时,包络R(t)调制,且调制器102变化给RF功率放大器112的供应电压。例如,组合供应调制与笛卡尔反馈,使得R(t)信号也是环路中的误差信号的函数。
一般地,DSP生成调制信号,其跟踪或追踪要发送的信号的包络。在先前的系统中,从不考虑反馈对RF功率放大器之前的信号的影响。在特定情形中,这样的反馈常导致偏离最优压缩水平。在本系统中,通过感应I与Q信号,并在基带放大之后将它们与I+I’及Q+Q’的相加的结果进行比较,来实现压缩检测或感应。压缩检测函数比较期望的信号与实际信号以及基带放大器(未显示)之前而非之后的点上的样本。
通过计算或通过映射(例如使用查找表)来确定期望的信号水平。如果过度压缩即将来临,由于笛卡儿反馈的影响,基带放大器的输出处的信号增加。如果该比较指示在RF放大时即将发生偏离最优压缩水平,DSP调整调制信号,从而使其偏离与发送的信号的包络的自发符合。
如图2所示,RFPA供应电压操作在iDEN模式,其中供应调制器跟踪iDEN包络。使用本发明的发射机架构,显著地增强了效率。例如,效率从单端(single ended)的RFPA的22%增加到使用供应调制的43%。进一步地,3∶1模式中的RFPA热耗散从0.95W削减到0.35W,削减了63%。
现在转到图3,供应调制器被显示为操作在Talkaround模式,其中其输出锁定到固定DC电压。比如说,效率从23%增加到45%。RFPA热耗散从2.68W削减到0.977W,削减了63.5%。因为Talkaround操作在连续模式中,热耗散的削减显著地避免了参考振荡器漂移,并增加了电池寿命。对于最优结果,将Talkaround模式中设置的供应调制器输出电压选择为满足输出功率规格所要求的最小值,导致最大化的效率。尽管不是必需的,该设置优选地是工厂调谐的。
在另一方面,这里描述的双模发射机提供绕过DC-DC转换器的能力。这样。Talkaround模式中电池直接向RFPA提供电力,以避免DC-DC转换器的效率损失(hit)。当Talkaround模式中RFPA的最优操作点接近电池电压时,所描述的绕过模式特别有用。绕过模式包括,比如说,与DC-DC转换器并联的开关。作为可供选择的另一替代方案,DC-DC转换器包括绕过模式,其中其内部开关被配置为在Talkaround模式中将电池直接连接到RFPA。
需要理解的是,对于本领域普通技术人员而言,本发明的各种方面的其它变动与修改的实现将显而易见,且本发明不受所描述的特定实施例的限制。因此,预期本发明覆盖任意修改、变动、或等价物,其落在这里公开和要求权利的基本的基础(underlying)原理的精神与范围之内。
Claims (10)
1.一种多模发射机,其包括:
调制器,其用于接收多种类型的信号之一,并用于输出对应于所接收信号的RF信号,所接收信号对应于所述多模发射机的预先确定的操作模式;和
RF功率放大器,其用于接收所述RF信号,并输出放大的信号,当所述发射机操作在预先确定的操作模式时,所述的放大的信号最大化所述发射机的操作效率。
2.如权利要求1所述的多模发射机,其中,所述调制器包括单供应调制器,其被配置以输出信号,以最大化所述调制器所处于的操作模式的效率。
3.如权利要求1所述的多模发射机,其中,所述调制器包括DC到DC转换器。
4.如权利要求1所述的多模发射机,其中,所述调制器的输出跟踪类似于所接收信号的RF包络的信号。
5.如权利要求1所述的多模发射机,其中,基于预先确定的操作模式,选择所接收的信号。
6.如权利要求5所述的多模发射机,其中,所接收的信号包括包络信号。
7.如权利要求5所述的多模发射机,其中,所接收的信号包括固定DC电压。
8.一种无线通信系统,其包括:
线性发射机,其被配置以操作在多个操作模式之一;
输入信号,其对应于所述线性发射机所处于的特定操作模式;
调制器,其用于接收所述输入信号,并输出对应于所述线性发射机所处于的所述操作模式的RF信号;和
功率放大器,其用于接收所述RF信号,并输出放大的信号,所述的放大的信号最大化所述线性发射机所处于的所述特定操作模式的操作效率。
9.如权利要求8所述的无线通信系统,其中,所述多个操作模式之一包括包络跟踪模式。
10.如权利要求9所述的无线通信系统,其中,所述多个操作模式之一包括这样的模式,其中包络是基本上恒定的。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/331,837 US20040127173A1 (en) | 2002-12-30 | 2002-12-30 | Multiple mode transmitter |
US10/331,837 | 2002-12-30 |
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CN1732627A true CN1732627A (zh) | 2006-02-08 |
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CNA2003801076629A Pending CN1732627A (zh) | 2002-12-30 | 2003-12-10 | 多模发射机 |
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US (1) | US20040127173A1 (zh) |
EP (1) | EP1582002A2 (zh) |
JP (1) | JP2006512850A (zh) |
KR (1) | KR20050088488A (zh) |
CN (1) | CN1732627A (zh) |
AU (1) | AU2003297767A1 (zh) |
WO (1) | WO2004062145A2 (zh) |
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CN101106411B (zh) * | 2006-07-13 | 2012-12-12 | 冲电气工业株式会社 | 多模接收电路 |
CN103731107A (zh) * | 2012-10-15 | 2014-04-16 | 英特尔移动通信有限责任公司 | 用于控制功率放大器的运行的控制电路和方法 |
CN107112953A (zh) * | 2014-11-14 | 2017-08-29 | 微软技术许可有限责任公司 | 用于放大射频信号的功率放大器 |
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US7801246B2 (en) * | 2006-12-30 | 2010-09-21 | Motorola Mobility, Inc. | Multi-mode communication device for generating constant envelope modulated signals using a quadrature modulator |
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-
2003
- 2003-12-10 AU AU2003297767A patent/AU2003297767A1/en not_active Abandoned
- 2003-12-10 EP EP03796835A patent/EP1582002A2/en not_active Withdrawn
- 2003-12-10 CN CNA2003801076629A patent/CN1732627A/zh active Pending
- 2003-12-10 JP JP2004565276A patent/JP2006512850A/ja not_active Withdrawn
- 2003-12-10 KR KR1020057012441A patent/KR20050088488A/ko not_active Application Discontinuation
- 2003-12-10 WO PCT/US2003/039085 patent/WO2004062145A2/en active Application Filing
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CN101106411B (zh) * | 2006-07-13 | 2012-12-12 | 冲电气工业株式会社 | 多模接收电路 |
CN102647195A (zh) * | 2011-02-18 | 2012-08-22 | 富士通株式会社 | 发射机和供电控制模块 |
CN103731107A (zh) * | 2012-10-15 | 2014-04-16 | 英特尔移动通信有限责任公司 | 用于控制功率放大器的运行的控制电路和方法 |
CN103731107B (zh) * | 2012-10-15 | 2018-03-30 | 英特尔德国有限责任公司 | 用于控制功率放大器的运行的控制电路和方法 |
CN107112953A (zh) * | 2014-11-14 | 2017-08-29 | 微软技术许可有限责任公司 | 用于放大射频信号的功率放大器 |
CN107112953B (zh) * | 2014-11-14 | 2020-10-02 | 微软技术许可有限责任公司 | 用于放大射频信号的功率放大器 |
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AU2003297767A1 (en) | 2004-07-29 |
EP1582002A2 (en) | 2005-10-05 |
WO2004062145A3 (en) | 2004-11-18 |
KR20050088488A (ko) | 2005-09-06 |
WO2004062145A2 (en) | 2004-07-22 |
AU2003297767A8 (en) | 2004-07-29 |
US20040127173A1 (en) | 2004-07-01 |
JP2006512850A (ja) | 2006-04-13 |
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