CN1230089A - 移动电话机 - Google Patents

移动电话机 Download PDF

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Publication number
CN1230089A
CN1230089A CN98105829A CN98105829A CN1230089A CN 1230089 A CN1230089 A CN 1230089A CN 98105829 A CN98105829 A CN 98105829A CN 98105829 A CN98105829 A CN 98105829A CN 1230089 A CN1230089 A CN 1230089A
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filter
telephone set
band
output
power amplifier
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CN98105829A
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CN1146273C (zh
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N·托尔森
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Lenovo Innovations Co ltd Hong Kong
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NEC Corp
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Priority to GB9620226A priority Critical patent/GB2317760B/en
Priority to US09/028,813 priority patent/US6212367B1/en
Priority claimed from AU56421/98A external-priority patent/AU769330B2/en
Application filed by NEC Corp filed Critical NEC Corp
Priority to CNB981058299A priority patent/CN1146273C/zh
Publication of CN1230089A publication Critical patent/CN1230089A/zh
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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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal
    • 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
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

一种移动电话机,符合在收话频带内的送话器噪声的严格技术规范要求。该移动电话机有一个调制器、一个功率放大器、一个可调谐滤波器和一个控制电路。调制器供产生待发送的送话频带内的信号;功率放大器给天线提供待发送的信号;可调谐滤波器配置在调制器与功率放大器之间,且具有通频带和衰减频带;控制电路将滤波器调谐得使通频带处在送话频带,使衰减频带处在电话机的收话频带。

Description

移动电话机
本发明涉及一种移动电话机。
一种周知的移动电话机是在UHF(超高频)频带的个别频率下送话和收话的。这种电话机用于TDMA[时分多址联接](GSM[移动通信全球系统])系统中，对这些系统来说，在送话器的噪声量落在收话器频带内的噪声量规定了严格的技术规范。有一种符合这个技术规范的周知技术在电话机送话器功率放大器输出端采用一个高Q(品质因数)陷波器。然而，这种滤波器较大，而且介入损耗显著。为补偿这种损耗，就得提高功率放大器的输出功率，从而增加了从电源提取的电流量，而这个电源通常是电话机内的电池，因而在电池容量一定的情况下，电话机的通话时间就减少了。
另一种周知的电话机是在产生待以发送频率发送信号的调制器与电话机的功率放大器之间连接一个锁相环，调制器的输出端接锁相环相敏检测器的输入端，功率放大器的输入端接锁相环的压控振荡器。这样，当锁相环处于锁相状态时，提供给功率放大器的送话器信号的宽频带噪声取决于压控振荡器的相位噪声。然而，在UHF下工作的低相位噪声压控振荡器是比较贵的。
本发明的目的是提供一种能符合在收话频带内对送话器噪声的严格技术规范的移动电话机。
本发明的目的是通过这样一种移动电话机达到的，这种移动电话机包括一个调制器、一个功率放大器、一个可调谐滤波器和一个控制电路。调制器用以产生在送话频带内发送的信号，功率放大器用以给天线提供待发送的信号，可调谐滤波器配置在调制器与功率放大器之间，且具有通频带和衰减频带，控制电路用以将滤波器调谐得使通频带处在送话频带，衰减频带处在电话机的收话频带。
按照本发明，功率放大器的输出没有任何损耗，因而实质上不影响通话时间。电路可采用较简单和较便宜的电路，因而实质上不影响电话机的成本。
参看举例说明本发明最佳实施例的附图，从下面的说明可以清楚理解本发明的上述和其它目的、特点和优点。
图1是本发明一个实施例的移动电话机的电路方框图。
图2是出现在图1的电话机中各波形的时序图。
本发明的电话机包括一个调制器，按照诸如TDMA(GSM)系统的一般系统产生经调制的UHF频带的载波。调制器1的输出经前置放大器2提供给电压可调谐的滤波器3。滤波器3的输出端接功率检测器4，且接功率放大器5的输入端，功率放大器5的输出端给天线提供送话信号。
功率检测器4的输出端接鉴相器6的第一输入端，鉴相器6可以包括一个倍增器，鉴相器6的另一个输入端接高频振动发生器7的输出端。鉴相器6的输出端接控制电路8的输入端，例如为运算放大器的形式，其一个输入端构成控制电路8的输入端，而另一输入端接一个基准电压源，该电压源用于提供相应于滤波器3最大输出功率的基准电压。发生器7和控制电路8的输出端接加法器9的输入端，加法器的输出端经抽样保持电路10接滤波器3的调谐电压输入端。
图2中，A示出了前置放大器2输出信号的包络线，B示出了功率放大器5在时间t2和t3之间的送话时隙期间输出信号的包络线，C示出了滤波器在时间t1和t2之间的校准时间。
在电话机正常工作期间，要发送信号时，一开始要使功率放大器5不起作用，以便使调制器1中和别处的各电路能够稳定而不受前置放大器2接通引起的电源过渡过程的影响。在送话顺序的初始阶段，从图2中的时间t1开始，提供信号D给抽样保持电路10的控制输入端11，从而使保持功能不起作用，并使加法器9的输出被直接提供给滤波器3的调谐电压输入端。
高频振动发生器7可以是例如接适当控制的计数器或微处理器输出端的数/模转换器(DAC)，由发生器7产生一变化电压，其电压幅值可以将滤波器3调谐到所要求的调谐频率范围内(即含来自前置放大器2的送话信号的频带内)。发生器7的输出电压在两相邻值之间“高频振动”，从而使电压可调谐的滤波器3在两相邻滤除值之间被调谐。滤波器3最好是一带通滤波器，其通频带宽得能足以传送前置放大器2的送话信号，且在通频带外面衰减的程度可使来自功率放大器5的电话机输出端的收话频带内的噪声符合所要求的技术规范。其它类型的滤波器，例如高通滤波器，也可以采用。
滤波器3的通频带在两中心频率之间高频振动时，滤波器3从调制器1和前置放大器2提供给功率检测器4的功率量在变化，因此检测器4的输出是变化的电压，其相对于发生器7输出信号的变化阶段取决于送话信号在滤波器3的通频带之上或之下。举例说，若送话信号的频率低于第一通频带和比第一通频带高的第二通频带，则当滤波器从第一通频带转到第二通频带时，检测器4的输出会下降。但是，若送话信号在第一和第二通频带以上，则从第一通频带转到第二通带会使检测器4的输出信号上升。这样，鉴相器6输出端提供的信号，其极性和大小取决于送话频带与滤波器通频带之间差值的极性和大小。
调谐正确时，控制电路8将检测器6的输出与滤波器3最大输出对应的基准值相比较。于是，电路8产生一误差信号加到由发生器7来的信号上，从而将滤波器3向送话频带方向调谐。这种配置方式起到了伺服反馈配置的作用，从而将滤波器3的通频带锁定到从调制器1来的送话信号的送话频带上。
控制电路8检测到滤波器3的输出功率为预定值时，抽样保持电路10在时间t2起作用，抽样保持调谐电压的准确值，并将其提供给滤波器3。这样，滤波器通频带就锁定到送话频带上。接着，功率放大器5起作用，使送话可以在其预定时间(例如图2中所示的时间t2)开始。
不言而喻，虽然上面提出了本发明的特性和优点，但其公开的内容仅仅是举例说明而已，在不脱离所附权利要求书范围的前提下，是可以对各部分的配置进行种种更改的。

Claims (8)

1．一种移动电话机，包括：
一个调制器，用以产生待在送话频带内发送的信号；
一个功率放大器，用以给天线提供待发送的信号；
一个可调谐的滤波器，配置在调制器与功率放大器之间，且具有通频带和衰减频带；和
一个控制电路，用以将滤波器调谐得使通频带处在送话频带，衰减频带处在电话机的收话频带。
2．如权利要求1所述的电话机，其特征在于，所述滤波器为带通滤波器。
3．如权利要求1或2所述的电话机，其特征在于，所述滤波器是电压可调谐式的。
4．如权利要求3所述的电话机，其特征在于，所述控制电路包括一个功率检测器和一个控制回路，功率检测器接滤波器的输出端，控制回路供改变滤波器的调谐电压直到检测预定功率为止。
5．如权利要求4所述的电话机，其特征在于，所述控制回路包括一个信号发生器和一个反馈电路，信号发生器供产生滤波器的变化电压，反馈电路的输入端接功率检测器，反馈电路的输出叠加在所述变化电压上。
6．如权利要求5所述的电话机，其特征在于，所述反馈电路包括一个倍增器和一个比较器，倍增器的输入端接功率检测器和信号发生器，比较器供将倍增器的输出与预定功率相应的基准电平相比较。
7．如3至6任一权利要求所述的电话机，其特征在于，还包括一个保持电路，用于在调谐滤波器之后保持调谐电压。
8．如以上任一权利要求所述的电话机，其特征在于，所述控制电路配置得使功率放大器不起作用，直到滤波器调谐好为止。
CNB981058299A 1996-09-27 1998-03-19 移动电话机 Expired - Fee Related CN1146273C (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9620226A GB2317760B (en) 1996-09-27 1996-09-27 Mobile telephone apparatus
US09/028,813 US6212367B1 (en) 1996-09-27 1998-02-24 Mobile telephone apparatus with tunable filter tuned to the transmit band
CNB981058299A CN1146273C (zh) 1996-09-27 1998-03-19 移动电话机

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9620226A GB2317760B (en) 1996-09-27 1996-09-27 Mobile telephone apparatus
US09/028,813 US6212367B1 (en) 1996-09-27 1998-02-24 Mobile telephone apparatus with tunable filter tuned to the transmit band
AU56421/98A AU769330B2 (en) 1998-03-02 1998-03-02 Mobile telephone apparatus
CNB981058299A CN1146273C (zh) 1996-09-27 1998-03-19 移动电话机

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Publication Number Publication Date
CN1230089A true CN1230089A (zh) 1999-09-29
CN1146273C CN1146273C (zh) 2004-04-14

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CN (1) CN1146273C (zh)
GB (1) GB2317760B (zh)

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CN102870333A (zh) * 2010-02-24 2013-01-09 华为技术有限公司 无线通信收发器中rf干扰信号和噪声的抑制
CN103095332A (zh) * 2011-10-28 2013-05-08 美国博通公司 具有可编程陷波滤波器的发送器前端及其使用方法
CN104184527A (zh) * 2013-05-21 2014-12-03 联发科技（新加坡）私人有限公司 传送功率测量装置以及传送功率测量方法

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CN102870333A (zh) * 2010-02-24 2013-01-09 华为技术有限公司 无线通信收发器中rf干扰信号和噪声的抑制
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CN104184527A (zh) * 2013-05-21 2014-12-03 联发科技（新加坡）私人有限公司 传送功率测量装置以及传送功率测量方法
CN104184527B (zh) * 2013-05-21 2017-04-12 联发科技（新加坡）私人有限公司 传送功率测量装置以及传送功率测量方法
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GB9620226D0 (en) 1996-11-13
GB2317760A (en) 1998-04-01
US6212367B1 (en) 2001-04-03
GB2317760B (en) 2000-09-13
CN1146273C (zh) 2004-04-14

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