CN1135690C - 无线通信终端的省电设备和省电方法 - Google Patents
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Abstract
一种用于无线通信终端的省电设备,通过改变功率放大级的数量来减少电流损耗。在无线通信终端里的功率放大器包括用于高功率的第一放大器(300)和用于低功率的第二放大器208。信号路径选择器(209)根据转换控制信号将输入信号转接到第一或第二放大器的输入节点。输出路径选择器根据该转换控制信号选择第一和第二放大器的输出信号之一。RSSI检测器(105)检测从基地台接收的信号强度。当该信号强度为低时控制器产生第一状态的转换控制信号,使所述信号路径选择器将输入信号转接到第一放大器(300),并使所述输出路径选择器选择第一放大器的输出信号;当该信号强度为高时产生第二状态的转换控制信号,使所述信号路径选择器将输入信号转接到第二放大器(200),并使输出路径选择器选择第二放大器的输出信号。电源(107)根据第二状态的转换控制信号阻塞对第一放大器的第一供电电压,根据第一状态的转换控制信号阻塞对第二放大器的第二供电电压。
Description
技术领域
本发明涉及无线通信终端,具体地涉及用于减少在电话交谈中的电流损耗的省电设备。
背景技术
在CDMA(码分多址)或PCS(个人通信系统)终端中,将RF(射频)功率放大器设计得具有+28dBm的最大输出功率,以满足IS-98标准和J-STD-008标准。此外,CDMA的发射机或PCS终端包括一个自动增益控制(AGC)放大器,用于根据接收信号的强度或从基地台发送的功率控制命令来控制功率水平。因此,在从基地台发送的信号具有低信号强度的区域该终端应增加发送功率,而在从基地台发送的信号具有高信号强度的区域应降低发送功率。
同时,采用QPSK(四相相移键控)调制的CDMA或PCS终端需要线性放大器。因此,该AGC放大器采用A一类或AB一类偏置。然而,在这种情况,不管发送功率如何终端都消耗恒定的电流。
图1表示一通常的两级功率放大器。如图1所示,激励放大器101首先放大输入的RF信号RF1,然后末级放大器放大从激励放大器101输出的放大的RF信号。对激励放大器101和末级放大器103二者提供固定电平的控制信号(或固定的增益控制信号),以控制功率水平。因此,不管信号的强度如何放大器101和103都消耗恒定无效电流。这造成了电流损耗的增加。
为了解决这一问题,建议一种方法,对功率放大器提供可变电平的控制信号,以控制该功率放大器的线性区,从而减少电流损耗。
图2表示一个改进的两级功率放大器。在图2中,将可变电平控制信号供给激励放大器101和末级放大器103。当发送功率低时,将该可变电平控制信号降低,以便将无效电流减到最小值。以这种方式,可将电流损耗减少到一定程度。然而构成功率放大器的每个元件具有不同的线性区。当一些元件具有窄的线性区时,就很难获得希望的功率节省效果。而且,不管可减少的无效电流如何小,该功率放大器的每一级都消耗恒定的电流。因此,在减少电流损耗的能力上有一个极限。也就是说,尽管发送功率足够低,使得无必要驱动末级放大器,但无效电流继续流入末级放大器,浪费了电流。
发明内容
因此,本发明的目的是提供一种省电设备,通过改变在无线通信终端中的功率放大级的数量来减少电流损耗。
为了达到上述目的,提供一种省电设备,用于包括高功率的第一放大器和低功率的第二放大器的无线通信终端。包括:信号路径选择器,根据转换控制信号将输入信号转换到第一和第二放大器的输入节点;输出路径选择器,根据该转换控制信号从第一和第二放大器选择一个输出信号;RSSI检测器,检测从基地台接收的信号的信号强度;控制器,分析检测的信号强度,当该信号强度低时,产生第一状态的转换控制信号,使信号路径选择器将输入信号转接到第一放大器,并使输出路径选择器选择第一放大器的输出信号,该控制器还产生第二状态的转换控制信号,当信号强度为高时,使信号路径选择器将输入信号转接到第二放大器,并使输出路径选择器选择第二放大器的输出信号;电源,根据第二状态的转换控制信号阻塞向第一放大器供给的第一供电电压;根据第一状态的转换控制信号阻塞向第二放大器供给的第二供电电压。
附图说明
从下面结合附图的详细描述,将使本发明的上述和其它目的,特征和优点变得更加清楚,其中相同的标号表示相同的部件,在图中:
图1是表示通常两级放大器的简图;
图2是表示另一通常两级放大器的简图;
图3是表示根据本发明一实施例的无线通信终端的省电设备的框图;
图4是表示根据本发明另一实施例的无线通信终端的省电设备的框图;
图5是表示该功率放大器的特性曲线的简图。
具体实施方式
下面将结合附图描述本发明的最佳实施例。在下面的描述中,未详细地描述已知的功能和结构,因为这种不必要的详述将冲谈本发明的内容。
图3表示根据本发明一实施例的无线通信终端的省电设备。如图所示,激励放大器101首先放大输入RF信号RF1,其次末级放大器103放大从激励放大器101输出的放大的RF信号。第一转换开关102为信号路径选择器,具有连接到激励放大器101的输出端的公共节点,第一接点12连接到末级放大器103的输入,第二接点13连接到第二转换开关104的第二接点27。根据来自控制器106的转换控制信号,将第一转换开关102的公共节点11分别转接到第一或第二接点(12或13)。第二转换开关104为输出路径选择器,具有一公共节点26,用于输出功率放大器的输出RF信号RF,第一接点25连接到末级放大器103的输出,第二接点27连接到第一转换开关102的第二接点13。同样,根据来自控制器106的转换控制信号,将第二转换开关104的公共节点26分别转换到第一或第二接点(25或27)。
RSSI(接收信号强度指示器)检测器105检测自基地台(未示出)接收的信号的强度(即RSSI值)。控制器106分析所检测的RSSI值,并根据分析的结果产生第一或第二状态的控制信号。电源107根据来自控制器106的转换控制信号分别将电压V1供给激励放大器101,将电压V2供给末级放大器103。例如,当转换控制信号是处于第一状态时,电源107将电压V1供给激励放大器101,并将电压V2供给末级放大器103。然而,当转换控制信号是处第二状态时,电源107将电压V1供给激励放大器101,并阻塞对末级放大器供给的电压V2。另外,对激励放大器101和末级放大器103提供可变电平控制信号。根据该可变电平控制信号改变放大器101和103的输出电平。
在操作中,当检测的RSSI值指示低信号强度时,控制器106产生第一状态的转换控制信号。然后,根据该第一状态的转换控制信号将第一和第二转换开关102和104的公共节点11和26分别转接到第一接点12和25。在这种情况下,将在激励放大器101中放大的RF信号RF1通过第一转换开关102送给末级放大器103,然后通过第二转换开关104输出。相反,当该检测RSSI值指示高信号强度时,控制器106产生第二状态的转换控制信号。然后,根据该第二状态的转换控制信号将第一和第二转换开关102和104的公共节点11和26分别转换到第二接点13和27。在这种情况,将在激励放大器101中放大的RF信号RF1通过第二转换开关104直接输出,不通过末级放大器103。
尽管所举的实施例包括两级放大器,但可理解,本发明可应用到具有3级或更多级的多级放大器。在这种情况,需要附加的信号路径选择器。
图4表示根据本发明另一实施例的无线通信终端的省电设备。如图所示,首先第一激励放大器201放大输入RF信号RF1,然后末级放大器203放大从激励放大器201输出的放大RF信号。放大器201和203构成第一功率放大器。作为第二功率放大器的第二激励放大器208放大输入RF信号RF1。此外,对用于高传输功率的第一功率放大器300和用于低传输功率的第二功率放大器208都供给可变电平控制信号。
第一转换开关209是信号路径选择器,根据来自控制器106的转换控制信号将输入RF信号RF1送给第一激励放大器201或第二激励放大器208。可用由电阻衰减器或变压器组成的功率分配器来代替第一转换开关209。第一转换开关209具有连接到输入RF信号RF1的公共节点31,连接到第一激励放大器201的输入的第一接点32,和连接到第二激励放大器208的输入的第二接点33。
第2转换开关210为输出路径选择器,根据来自控制器106的转换控制信号,通过公用节点46从末级放大器203或第二激励放大器208输出RF信号。第二转换开关210具有连接到末级放大器203的输出的第一接点45,和连接到第二激励放大器208的输出的第二接点47。
RSSI检测器105检测从基地台接收的信号的RSSI值。控制器106分析该检测的RSSI值,并根据分析的结果产生第一或第二状态的转换控制信号。电源107根据来自控制器106的转换控制信号将电压V1供给第一功率放大器300,将电压V2供给第二功率放大器208。例如,当该转换控制信号是处于第一状态时,电源107阻塞对第二功率放大器供给的V2电压,将电压V1供给第一功率放大器300。然而,当该转换控制信号是处于第2状态时,电源107阻塞对第一功率放大器供给的电压V1,将电压V2供给第二功率放大器208。根据可变电平控制信号来改变放大器201,203和208的输出电平。
在操作中,当检测的RSSI值指示低信号强度时,控制器106产生第一状态的转换控制信号。然后,根据该第一状态的转换信号,将第一和第二转换开关209和210的公共节点31和46分别转接到它们的第一接点32和45。在这种情况,输入RF信号RF1由第一激励放大器201和末级放大器203顺序地放大。并通过第二转换开关210输出。相反,当检测的RSSI值指示高信号强度时,控制器106产生第二状态的转换控制信号。然后,根据该第二状态的转换控制信号,将第一和第二转换开关209和210的公共节点31和46分别转接到它们的第二接点33和47。在这种情况,输入RF信号RF1由第二激励放大器208放大,然后通过第二转换开关210输出。
图5表示一无线通信终端的输出特性曲线。具体地说,该特性曲线表示在概率密度和传输功率方面的传输信号强度的场测试结果。
参看图3和5,假定激励放大器101具有20dB增益和20dBm的最大输出功率,末级放大器103具有超过8dB的增益和28dBm的最大输出功率,当传输功率高达17dBm(图5)时允许关断(或阻塞)末级放大器103。具体地,当确定传输功率小于或等于17dBm(图5)时,控制器106产生第一状态的转换控制信号,以便通过旁路方式操作第一和第二转换开关102和104。然后,电源107根据该第二状态的转换控制信号阻塞对末级放大器103的供电电压V2。在这种情况,因为电流未流入末级放大器103,故可减少电流损耗。相反,当传输功率超过17dBm时,控制器106产生第二状态的转换控制信号,以便用加电(power-up)方式操作第一和第二转换开关102和104。在这种情况,将末级放大器103加电以便正常工作。
参看图4和5,假定第一激励放大器201和末级放大器203都具有28dB的增益和+28dBm的最大输出功率。第二激励放大器208具有13dB的增益和+13dBm的最大输出功率,当传输功率小于或等于13dBm(图5)时,允许关断第一激励放大器201和末级放大器203。具体地,控制器106接通第二激励放大器208,并将第一和第二转换开关209和210转接到第二激励放大器208。结果,首先在第二激励放大器上放大输入RF信号RF1,接着通过第二转换开关210输出RF信号RF0。为此,控制器106产生其传输功率达到13dBm(图5)程度的第一状态转换控制信号。电源107根据该第一状态的转换控制信号阻塞对第二激励放大器208的供电电压V2,并将电压V1供给第一功率放大器300。以这种方式,可以节省在末级放大器203中消耗的电流。相反,当传输功率超过13dBm时,控制器106产生第二状态的转换控制信号,以便将第一和第二转换开关209和210转接到第一功率放大器300。在这种情况,将第一激励放大器201和末级放大器203加电以便正常工作。
最好,将RF功率放大器设计为具有磁滞特性,以防止在确定转换方式中的误操作。也就是说,当传输功率低,因为接收信号具有高强度,而使用第二激励放大器208。与此同时,如果需要将传输功率增加到7dBm以上,则将第二激励放大器208断开而不是将第一功率放大器300接通来增加传输功率。另外,当需要处理或放大低于10dBm的传输功率以输出13dBm传输功率时,将第一功率放大器300断开,而不是将第二功率放大器208接通。
通常,在市区,无线电通信终端输出平均传输功率。因此,该RF功率放大器以旁路方式工作,其中将末级放大器关断阻塞无效电流流入它,从而减少了总的电流损耗,增加了电池的寿命。
如上所述,本发明的省电设备减少了在电话交谈中的电流损耗,延长了电池的寿命。
尽管结合具体的实施例详细地描述了本发明,但这只是一个举例的应用。因此应该清楚了解,在本发明的范围和精神之内,本领域的技术人员可做出许多变化。
Claims (17)
1.一种省电设备用于包括多级功率放大器和RSSI(接收信号强度指示器)检测器的无线通信终端,包括:
控制器,根据由RSSI检测器检测的,从基地台接收的信号的RSSI值,产生转换控制信号;
输出路径选择器,根据所述转换控制信号选择来自第一放大器的输出信号和第二放大器的输出信号之一;
信号路径选择器,连接在第一放大器和第二放大器之间,根据所述转换控制信号,将第一放大器的输出选择地连接到第二放大器或所述输出路径选择器;和
电源,当根据所述转换控制信号将第一放大器的输出连接到所述输出路径选择器时,阻塞对第二放大器的供电电压。
2.根据权利要求1所述的省电设备,其中对第一和第二放大器提供在控制器中产生的可变电平控制信号。
3.一种省电设备,用于具有高功率的第一放大器和低功率的第二放大器的无线通信终端,包括:
信号路径选择器,用于将输入信号转接到第一或第二放大器的输入节点;
输出路径选择器,用于选择从第一和第二放大器的输出信号;
RSSI检测器,用于检测从基地台接收的信号的信号强度;
控制器,用于分析所检测的信号强度,根据所述分析产生第一状态的转换控制信号,使信号路径选择器将输入信号转接到第一放大器,并使输出路径选择器选择第一放大器的输出信号,根据所述分析产生第二状态的转换控制信号,使信号路径选择器将输入信号转接到第二放大器,并使输出路径选择器选择第二放大器的输出信号;以及
电源,根据第二状态的转换控制信号阻塞对第一放大器的第一供电电压,根据第一状态的转换控制信号阻塞对第二放大器的第二供电电压。
4.根据权利要求3所述的省电设备,其中第一放大器具有的增益比第二放大器的高。
5.根据权利要求4所述的省电设备,其中所述的信号路径选择器是功率分配器。
6.根据权利要求3所述的省电设备,其中所述的信号路径选择器包括一转换开关,具有一个连接到输入信号的公共节点,连接到第一放大器输入的第一接点和连接到第二放大器输入的第二接点。
7.根据权利要求3所述的省电设备,其中对第一和第二放大器提供在控制器中产生的可变电平控制信号。
8.根据权利要求3所述的省电设备,其中当接收的信号强度小于或等于预定的电平时,在控制器中产生第一状态的转换控制信号。
9.根据权利要求3所述的省电设备,其中当接收的信号强度高于预定的电平时,在控制器中产生第二状态的转换控制信号。
10.根据权利要求8所述的省电设备,其中的预定电平为17dBm。
11.根据权利要求8所述的省电设备,其中的预定电平为13dBm。
12.根据权利要求9所述的省电设备,其中的预定电平为17dBm。
13.根据权利要求9所述的省电设备,其中的预定电平为13dBm。
14.一种省电方法,用在具有多级功率放大器和RSSI(接收信号强度指示)检测器的无线通信终端中,所述方法包括步骤:
确定从基地台接收的信号的信号强度;
根据所检测的信号强度产生转换控制信号;
根据所产生的转换控制信号,为所接收的信号选择输入路径和输出路径;和
根据所述转换控制信号阻塞对多级放大器之一级的供电电压。
15.根据权利要求14所述的方法,其中所述的产生步骤还包括步骤:
当确定的接收信号强度等于或小于预定值时,产生第一状态的转换控制信号;和
当确定的接收信号强度大于预定值时,产生第二状态的转换控制信号。
16.根据权利要求15所述的方法,其中所述的预定值为13dBm。
17.根据权利要求15所述的方法,其中所述的预定值为17dBm。
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KR1019970069207A KR100241780B1 (ko) | 1997-12-16 | 1997-12-16 | 무선 통신 단말기의 전원 절약 장치 |
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GB2319918B (en) * | 1996-12-02 | 2001-04-04 | Nokia Mobile Phones Ltd | Amplifier system |
KR100266806B1 (ko) * | 1996-12-11 | 2000-09-15 | 윤종용 | 휴대용무선통신단말기의전력제어회로및방법 |
-
1997
- 1997-12-16 KR KR1019970069207A patent/KR100241780B1/ko active IP Right Grant
-
1998
- 1998-11-30 DE DE69833386T patent/DE69833386T2/de not_active Expired - Lifetime
- 1998-11-30 CN CNB98802571XA patent/CN1135690C/zh not_active Expired - Fee Related
- 1998-11-30 EP EP98959239A patent/EP0960475B1/en not_active Expired - Lifetime
- 1998-11-30 JP JP11532382A patent/JP2000513544A/ja active Pending
- 1998-11-30 WO PCT/KR1998/000385 patent/WO1999031799A1/en active IP Right Grant
- 1998-11-30 IL IL13131398A patent/IL131313A/xx not_active IP Right Cessation
- 1998-11-30 AU AU15087/99A patent/AU732676B2/en not_active Ceased
- 1998-11-30 BR BR9807388-5A patent/BR9807388A/pt not_active Application Discontinuation
- 1998-12-16 US US09/212,870 patent/US6397090B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU732676B2 (en) | 2001-04-26 |
BR9807388A (pt) | 2000-03-14 |
KR19990050145A (ko) | 1999-07-05 |
JP2000513544A (ja) | 2000-10-10 |
IL131313A (en) | 2003-06-24 |
EP0960475A1 (en) | 1999-12-01 |
EP0960475B1 (en) | 2006-02-01 |
AU1508799A (en) | 1999-07-05 |
US6397090B1 (en) | 2002-05-28 |
WO1999031799A1 (en) | 1999-06-24 |
IL131313A0 (en) | 2001-01-28 |
DE69833386T2 (de) | 2006-07-13 |
DE69833386D1 (de) | 2006-04-13 |
KR100241780B1 (ko) | 2000-02-01 |
CN1247647A (zh) | 2000-03-15 |
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