CN1134104C - 改进蜂窝电话中发射机功率的测量动态范围的系统 - Google Patents
改进蜂窝电话中发射机功率的测量动态范围的系统 Download PDFInfo
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Abstract
用于具有发射机的移动站中的一种改进的功率输出控制电路,该发射机包括发射机可变增益放大器,产生施加到天线的RF输出信号。该改进的功率输出控制电路包括检波器电路,用于将输入信号整流产生代表输入信号功率电平的DC输出。采样电路被连接到发射机和检波器电路,用于交替地连接和断开从发射机到检波器电路的RF信号,从而使检波器电路产生交替的DC输出信号。一种可变增益AC放大器被连到检波器电路,用于将检波器输出放大。一种增益控制电路被连到AC放大器,用于接收被放大的检波器输出,并将其与选择标准作比较,以便产生反馈信号,用于改变AC放大器增益,保持所希望的恒定的输出电平,该反馈信号表示发射机输出功率。一种比较器将反馈信号与控制标准作比较,以便控制发射机可变增益放大器的增益。
Description
发明领域
本发明涉及用于移动蜂窝电话系统的功率输出控制电路,更具体而言,涉及一种改进蜂窝电话中发射机功率测量的动态范围的系统。
发明背景
移动蜂窝电话包括一个发射机,产生施加到天线上的RF输出信号。希望能够控制功率输出到保持可靠通信必需的最低限度电平上。这使用户之间的干扰为最小和使电池寿命为最长。
目前的蜂窝电话系统对所发送的RF信号采样并将它与已知的与特定的发射机功率电平对应的DC控制电压作比较。将差信号反馈到增益控制发射机级,按需要调节其功率的升或降以达到所希望的功率输出。在作为制造测试过程的部分实行的标定步骤中建立DC控制电压和RF输出功率之间的相关。设置电话以发送已知的功率电平。通常是低,中,和高功率,并将检测器电压读出并作为数字字存储在非挥发性存储器中。这个步骤可在贯穿工作频带的几个频率上重复。在标定点之间值可通过软件内插以产生中间功率输出。
一种典型的检波器电路利用一个二极管将RF信号整流为与功率输出成比例的DC信号。为了改进二极管检波器的灵敏度,通常使DC偏置电流通过二极管。这就克服了二极管的阈值电压,改进了在低信号电平上的检测能力。然而,由于二极管的PN结的温度依赖性,从检波器的输出电压随温度变化。当检测到的功率电平减小时,测量就变得不那么准确,因为与温度有关的偏置电压成为检波器的DC输出电压的较大部分。为了克服检波器二极管的温度依赖性,已经提出了一些方案,利用一个相同的二极管来低消温度变化的电压。然而,精确的匹配是困难的,并且当检测的功率减小时,不准确度增加。
本发明的目的是用一种新型的,简单的方式克服以上的问题。
发明概述
依据本发明在此提供一种系统和方法,用于改进在蜂窝电话中发射机功率测量的动态范围。
概括地说,在此公开了一种用于移动站的改进的功率输出控制电路,具有一种发射机,包括一个发射机可变增益放大器,产生RF输出信号施加到天线上。该改进的功率输出控制电路包括一个检波器电路,用于将输入信号整流以产生表示输入信号功率电平的DC输出。将一个采样电路连接到该发射机和该检波器电路,用于交替地连接和断开从该发射机到该检波器电路的RF信号,从而使该检波器电路产生交替的DC输出信号。将一个可变增益AC放大器连到该检波器电路,用于放大该检波器输出。将增益控制电路连到AC放大器,用于接收被放大的检波器输出并将它与一个选择标准作比较,以产生用于改变AC放大器增益的反馈信号,从而保持所希望的恒定的输出电平,该反馈信号代表发射机输出功率。比较器将该反馈信号与控制标准作比较,以控制发射机可变增益放大器的增益。
本发明的一个特征是该检波器电路包括一个二极管检波器电路。偏置电路传送DC偏置电流通过检波器电路以改进检波器电路的灵敏度。耦合电容将检波器电路连到采样电路以便将DC偏置与采样电路隔离。另一个耦合电容将检波器输出连到可变增益AC放大器以便从交变的DC输出信号除去检波器偏置电压。
本发明的另一个特征是该采样电路包括一个由时钟电路控制的开关。
本发明的再一个特征是该增益控制电路包括一个模数转换器,将交变的DC输出信号的高和低的模拟值变换成数字值。该增益控制电路包括一个编程的处理器电路。该编程的处理器电路将高和低数字值之间的幅度差与该选择标准作比较,该反馈信号代表比较的结果。数模转换器连接在该编程处理器电路和该可变增益AC放大器之间,将反馈信号转换成模拟信号。
依据本发明的另一方面在此公开了一种在具有一个发射机的移动站中控制输出功率的方法,该发射机包括一个发射机可变增益放大器,产生施加到天线上的RF输出信号。本方法包括步骤:交替地操作开关将从发射机到电压检波器的RF信号连接和断开,用以产生交替的DC输出信号;将该交替的DC输出信号放大;并将该放大的交替DC信号与选择标准作比较以产生反馈值,该反馈值代表发射机输出功率;根据该反馈值改变放大的交替DC信号的增益以便保持所希望的恒定的AC放大器输出电平;和利用该反馈值控制该发射机可变增益放大器的增益。
本发明的一个目的是提供一种不需要对检波器温度补偿的功率输出控制电路。
本发明的另一个目的是提供一种有能力比现有技术更准确地测量低功率电平的功率输出控制电路。
本发明的另一个目的是提供一种功率输出控制电路,当进行高功率测量时通过利用一个可变增益放大器作为衰减器以避免饱和。
还是本发明的又一个目的是提供一种功率输出控制电路,在其中通过可变增益AC放大器的增益和控制范围来设置功率测量的动态范围。
本发明其它的特征和优点从说明书和附图很容易明白。
附图简述
图1是用作说明包括依据本发明的一个功率输出控制电路的移动站的一般性方框图;
图2是一种现有技术功率输出控制电路的简图;
图3是一种随功率输出控制电路使用的现有技术三极管检波器电路的简图;
图4是用作说明依据本发明改进的功率输出控制电路的简图/方框图;
图5是用作说明图4的一种检波器电路输出的曲线;和
图6是用作说明图4的一种放大器电路输出的曲线。
发明详述
图1是一种典型的移动站(也称为无线电话,蜂窝型电话,或蜂窝电话)的一般性方框图,一般用10表示。移动站10包括天线12,用于在本身和无线网之间发送和接收无线电信号。天线12被连到发射机/接收机电路14,利用相同的天线12播放和接收信号。依照惯例,发射机/接收机14的接收机部分对一个或多个信道中的无线电信号解调,逆多路复用和解码。这些信道包括一个控制信道和一个用于语音或数据的通信业务信道。语音可被发送到包括扬声器(未示出)的输入/输出设备16。来自控制信道的消息被发送到一个使用有关的存储器20的被编程的处理器18。被编程的处理器18对在控制信道上的消息作出响应,利用存储在存储器20中的程序和数据控制和协调移动站10的功能,以便在无线网内运行。处理器18也控制发射机/接收机14的发射机部分的操作。发射机将模拟电信号变换成数字数据,将数据编码并带上差错检测和校正信息,和将该数据与来自处理器18的控制消息多路复用。发射机将该组合的数据流调制并利用天线12将所得到的无线电RF信号播放到无线网。
参考图2,示出随同一个移动站,如移动站10,的发射机使用的功率检测电路的简图。在方框22上的RF输出信号由发射机/接收机14的发射机部分产生。在施加到天线12以前,RF输入信号被可变增益放大器24和随后的功率放大器26放大。来自功率放大器26的输出功率的样本被通过二极管检波器电路28变换成DC输出。二极管检波器电路被连到一个DC差分放大器30的负输入。来自方框32的控制电压被施加到DC放大器30的正输入。控制电压对应于已知的功率电平。DC放大器30通过调节在发射通路中的可变增益放大器24的增益驱使其输入端之间的电压差为零。当在差分放大器输入端间出现零伏时,输出功率已被调节到由方框32上的控制电压确定的适当的电平。通过改变方框32上的控制电压可将输出功率设置为另一个值。典型情况下,对应于特定的输出功率的DC电压设置值在生产测试中被确定并存储在非挥发性存储器中。
虽然未示出,功率控制环路的模拟部分可利用数字电路代替,利用连到一种被编程的处理器1如图1的处理器18,的模数和数模变换器来实现。
参考图3,较详细地示出二极管检波器28。发送RF方框34表示图2中功率放大器26的输出。方框34的输出被通过耦合电容C1连到二极管检波器电路28。来自方框36的偏置电压被通过电阻R1连到耦合电容C1。二极管D1被连到电容C1和电阻R1的结合点。二极管D产生方框38上的DC输出,对应于在图2中施加到DC放大器30的信号。DC输出38由等于偏置电流乘检波器电阻R1的积的失调或偏置项和与RF功率成比例的另一项组合。由电阻器R2和电容器C3组成的滤波器从检波器输出滤去RF,只留下DC成分。由于二极管D的温度依赖性,在方框38上的输出电压随温度改变。当检测到的功率电平减小时,由于温度有关的失调电压成为检波器DC输出电压的较大部分,测量成为不那么准确。
依据本发明,一种功率输出控制电路不需要对检波器二极管温度补偿,有能力测量低功率电平,避免高功率测量时饱和,并提供改进的动态范围。
参考图4,示出一种依据本发明的功率输出控制电路40。功率输出控制电路用于移动站,如图1中的移动站10,具有一种包括发射机可变增益放大器24的发射机,见图2,产生施加到天线12的RF输出信号。施加到天线12的信号被表示在发送RF方框34上,与图3中类似,依据在方框32上的控制电压或功率参考,与图2类似。
为简单起见,与以上所讨论过的与图2和3有关的部件对应的部件利用类似的参考数字示出。
来自方框34的发送信号的部分被通过耦合电容C1采样。耦合电容可由其他装置代替,例如微带或条线耦合器。开关42被连到耦合电容C1。开关42由钟44控制。开关42交替地连接和断开到达或来自检波器电路28的被采样的发送信号。按预先规定的速率重复地进行。多种小型砷化镓开关可用于实现开关42的功能。
沿着来自偏置方框36的外部DC电压通过电阻R1和R2将检波器电路28偏置。电容器C2被连接在检波器电路28和开关42之间,电容器C2隔离来自开关42的DC偏置,以防止偏置电压和开关功能之间的任何交互作用。当开关42断开时,在R2/C3滤波器上的DC电压等于偏置电压,当开关导通时,等于偏置电压加检测到的RF信号之和。因为开关重复地操作,也就是它是定时工作的,在R2/C3滤波器上的电压是方波形式的交替DC输出信号,如图5中所示。特别是,当开关导通的部分表示在DC电平46,当开关42断开的部分表示在DC电平48。方波的下部表示检波器偏置电压,在50上示出,而方波的上部表示检波器偏置电压和检测到的RF电压,在52上示出。振荡表示噪声。
耦合电容C4将检波器电路28的DC输出连到AC可变增益放大器54。耦合电容C4从交替的DC输出信号除去检波器偏置电压。检波器电压的AC成分被可变增益放大器54放大。可变增益放大器54的输出被通过电容C5连到模拟数字(A/D)变换器56。A/D变换器56对放大器的方波输出在其最小值上采样,代表无信号值,在其最大值上采样,代表信号当前值,并将这些信号供给处理器电路18。放大器输出电压示于图6中。处理器18取两个测量,也就是图6中电平58所示的在检波器上无RF信号,和图6中电平60所示的检波器上出现的RF信号,之间的差。
处理器18被连到数模(D/A)变换器62,该变换器有一个连到AC可变增益放大器54的模拟输出。处理器18取在图6中58和60表示的两个测量电平之间的差,并确定是否差低于预先规定的电平。如果是的,那末通过增加对D/A变换器62的反馈值增加放大器54的增益,从而增加反馈信号。如果测量到的值在预先规定的电平之上,那末通过减小反馈值减少放大器54的增益,从而减小反馈信号。目的是通过利用反馈控制增益,提供从AC可变增益放大器54输出的固定电平。A/D变换器56的输出与参考电平比较的结果是或者增加或者减小在D/A变换器62输入上的数字字,并且相应地或者增加或者减少AC可变增益放大器54的增益。
虽然反馈增益控制是利用数字电路示出的,这些功率可利用其他电路实现,例如一种控制放大器54的增益的模拟自动增益环路,这将会明白。
供给D/A变换器62的反馈值是检波器电压的表象,依次又是发射机输出功率的表象。该数字字,或相应的施加到可变增益放大器54的模拟电压,被供给比较器64,与来自方框32,代表特定的功率电平的参考电平作比较,该电平在工厂标定过程期间存储在电话的存储器中。来自这种比较的差错信号被反馈到发送通路中,见图2,可变增益发送放大器24的增益控制组,以实现功率控制。这种功能,再次可或者在数字或者在模拟域中实现。
为了相当小的,省钱的实现这种电路,AC可变增益放大器54和变换器56和62可集成在一个单片中。
通过适当地选择AC可变增益放大器特性,DC耦合检波器的低电平检测问题可被消除,因为从测量中除去DC偏置成分,有足够的增益可用于实现满度的A/D量程。同样,高电平的测量被改进,因为如果必要的话,可变增益放大器可被调节为衰减被检测到的信号,以实现满度A/D量程。
因此,通过利用一种AC可变增益放大器,提供一种在低功率电平工作的功率输出控制电路。这就消除检波器电路中的不确定性,在此电路中将偏置信号与所希望的信号分离是困难的。利用对被采样信号的斩波能够将随温度变化的DC偏置除去。
依据本发明发射机功率测量的动态范围等于AC可变增益放大器54所控制增益的范围。
Claims (20)
1.一种功率控制电路,用于控制由发射机产生的并加到天线的RF输出信号的输出功率电平,所述功率控制电路包括:
检波器电路,用于对所述RF输出信号进行整流,产生代表所述RF输出信号的功率电平的DC输出信号;
采样电路,连接在所述发射机和所述检波器电路之间,用于将所述检波器电路周期地连接到所述发射机,使得所述检波器电路根据所述RF输出信号产生交替的DC输出信号;
AC放大器,连接到该检波器电路,用于放大所述DC输出信号,所述AC放大器具有根据反馈信号的可变增益,以保持从所述AC放大器的希望的恒定输出电平;
增益控制电路,连接到所述AC放大器,用于将所述放大的DC输出信号与选择标准进行比较,并根据所述比较产生反馈信号,其中所述反馈信号表示所述发射机的输出功率电平;和
比较器,用于将所述反馈信号与一功率控制标准进行比较,以便产生功率控制信号,来控制所述发射机的发射功率电平。
2.如权利要求1的功率输出控制电路,其中所述的检波器电路包括二极管检波器电路。
3.如权利要求2的功率输出控制电路,还包括一个偏置电路,用于使DC偏置电流通过该检波器电路,以改进该检波器电路的灵敏度。
4.如权利要求3的功率输出控制电路,还包括一个将该检波器电路连到该采样电路的耦合电容,用以将该DC偏置与该采样电路隔离。
5.如权利要求1的功率输出控制电路,其中该采样电路包括一个由时钟电路控制的开关。
6.如权利要求3的功率输出控制电路,还包括一个将该检波器连到该AC放大器的耦合电容,用以从交替的DC输出信号中除去检波器偏置电压。
7.如权利要求1的功率输出控制电路,其中该增益控制电路包括模数转换器,将该交替的DC输出信号转换成数字值。
8.如权利要求7的功率输出控制电路,其中该增益控制电路包括一个被编程的处理器电路。
9.如权利要求7的功率输出控制电路,其中该被编程的处理器电路根据最大和最小数字值之间的差产生该反馈信号。
10.如权利要求9的功率输出控制电路,还包括连接在该被编程的处理器电路和该可变增益AC放大器之间的数模转换器,用于将该反馈信号转换为模拟信号。
11.一种控制发射机的输出功率电平的方法,该发射机具有一个可变增益放大器并产生RF输出信号施加到天线上,该方法包括以下步骤:
周期地连接该发射机到检波器电路,以便根据该RF输出信号从该检波器电路中产生交替的DC输出信号;
在可变增益放大器中放大该交替的DC输出信号;
将该放大的交替DC输出信号与选择标准作比较,产生表示该发射机输出功率电平的反馈信号;
根据该反馈信号改变该可变增益放大器的增益,以便保持来自该可变增益放大器的希望输出电平;和
根据该反馈信号产生功率控制信号,以控制该发射机的发射功率电平。
12.如权利要求11的方法,其中周期地连接该发射机到检波器电路以便根据该RF输出信号产生交替的DC输出信号的步骤包括:连接在该发射机与该检波器电路之间的开关,并利用时钟控制该开关。
13.如权利要求12的方法,其中周期地连接该发射机到检波器电路以便根据该RF输出信号产生交替的DC输出信号的步骤还包括:在该检波器电路中对该RF输出信号进行整流。
14.如权利要求13的方法,还包括让DC偏置电流通过该检波器电路,以改进该检测器电路的灵敏度。
15.如权利要求14的方法,还包括利用一个耦合电容将该DC偏置与该开关隔离。
16.如权利要求15的方法,还包括利用一个耦合电容,从该DC输出信号中除去该偏置电压。
17.如权利要求11的方法,还包括将该交替DC输出信号变换为数字值。
18.如权利要求17的方法,其中由被编程的处理器电路执行将该放大的交替DC输出信号与选择标准进行比较,以产生表示该发射机发射功率电平的反馈信号。
19.如权利要求18的方法,将该放大的交替DC输出信号与选择标准比较以产生表示该发射机的发射功率电平的反馈信号的步骤包括:计算在最大和最小数字值之间的差。
20.根据权利要求19的方法还包括:将该反馈信号转换为模拟信号。
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US09/131135 | 1998-08-07 | ||
US09/131,135 | 1998-08-07 | ||
US09/131,135 US6128477A (en) | 1998-08-07 | 1998-08-07 | System for improving the dynamic range of transmitter power measurement in a cellular telephone |
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CN1322400A CN1322400A (zh) | 2001-11-14 |
CN1134104C true CN1134104C (zh) | 2004-01-07 |
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US (1) | US6128477A (zh) |
EP (1) | EP1110310B1 (zh) |
CN (1) | CN1134104C (zh) |
AU (1) | AU4971399A (zh) |
BR (1) | BR9912771A (zh) |
EE (1) | EE04325B1 (zh) |
HK (1) | HK1041748B (zh) |
WO (1) | WO2000008753A1 (zh) |
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AU4971399A (en) | 2000-02-28 |
EP1110310B1 (en) | 2002-11-06 |
US6128477A (en) | 2000-10-03 |
EP1110310A1 (en) | 2001-06-27 |
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WO2000008753A1 (en) | 2000-02-17 |
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