CN1092425C - 发射射频信号的方法和装置 - Google Patents

发射射频信号的方法和装置 Download PDF

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CN1092425C
CN1092425C CN98104474.3A CN98104474A CN1092425C CN 1092425 C CN1092425 C CN 1092425C CN 98104474 A CN98104474 A CN 98104474A CN 1092425 C CN1092425 C CN 1092425C
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electric capacity
output signal
coupled
voltage
oscillation output
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CN1191423A (zh
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戴卫·苏瑟兰德·伯克哈姆
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Motorola Mobility LLC
Google Technology Holdings LLC
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Motorola Inc
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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
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
    • H03B5/1841—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator
    • H03B5/1847—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a strip line resonator the active element in the amplifier being a semiconductor device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)

Abstract

晶体管VCO包括接收波段选择信号的节点，用于调整晶体管的基-射极电容，以使能VCO在适当波段作为振荡器，且用于调整谐振频率，以改变振荡器的谐振频率。方法和装置使能在不同频段的振荡，用于双模通信装置。

Description

发射射频信号的方法和装置
本发明通常涉及通信装置，更具体地，涉及发射射频信号的方法和装置。
随无线通信装置使用的增加，频谱变得缺乏。在许多情况中，在一个具体波段上提供服务的网络运行者不得不在分立的波段提供服务，以满足其用户。例如，在900MHZ频率中GSM系统上提供服务的网络运行者可能会不得不依靠在1800MHZ频率的DCS系统。因此，如蜂窝无线电话的通信装置必须能在两个频率甚至第三个系统如DCS1900通信。这种运行在两个或以上频率的要求产生许多问题。例如，如果发射机包括在每个波段中发射信号的分立的部件，通信装置将增加尺寸和成本。
本发明的目的是提供一种发射射频信号的方法和装置，在一组波段中发射通信信号，同时最小化部件的增加。
本发明提供一种发射射频信号的装置，包括压控振荡器，所述压控振荡器包括：
晶体管，用于产生谐振输出信号，所述晶体管有基极、集电极和射极；
第一电感和第一电容，耦合到所述晶体管的基极；
第一控制节点，耦合以接收波段选择电压，所述波段选择电压耦合第二电容到所述基极和所述射极，用于调整所述输出信号的波段；和
第二控制节点，耦合以接收所述波段选择电压，用于耦合第三电容到射极，用于调整所述谐振输出信号。
本发明提供一种发射射频信号的方法，包括产生可变振荡输出信号，所述方法包括步骤：
产生振荡输出信号；
接收第一波段选择电压；
耦合第一电容到所述晶体管的基极，用于响应所述第一波段选择电压调整所述振荡输出信号的频段。
本发明的优点是：在一组波段中发射通信信号，避免所有波段都需要滤波器，结构简单。
附图描述
图1是根据本发明的通信装置的框图；
图2是根据本发明的图1的发射机123的框图；
图3是根据本发明的发射机压控振荡器204的电路图。
现翻到图1，示出实现本发明的如蜂窝无线电话的无线通信装置的框图。在优选实施方案中，帧产生器ASIC101，如可从MOTOROLA公司得到的CMOS ASIC，和微处理器103，如也可从MOTOROLA公司得到的68HC11，组合以产生必要的通信协议，用于在蜂窝系统中运行。微处理器103用包括RAM105、EEPROM107和ROM109的存储器104，优选固化于一个封装111内，以执行产生协议必需的步骤和执行用于无线通信装置的其它功能，如向显示器113写、从袖珍键盘115接受信息、接受根据本发明由连接器116输入/输出的信息、控制频率合成器125、或执行根据本发明的方法放大信号所必需的步骤。ASIC101处理由麦克风117和到扬声器121的由音频电路119变换的音频。
收发信机处理射频信号。具体地，发射机123通过天线129用由频率合成器125产生的载频发射。由通信装置的天线129接收的信息进入接收机127，它用来自频率合成器125的载频解调字符。通信装置可选地包括消息接收机和其中包括数字信号处理装置的存储装置130。消息接收机和存储装置能是，例如，数字应答机或寻呼接收机。
现翻到图2，示出图1的发射机电路123。具体地，平移(translational)IC202和发射机压控振荡器204(VCO)形成调制器205。平移IC提供用于发射机电路的锁相环。平移IC202从偏值VCO和主VCO接收调制的输入信号。如将参照图3详细描述，平移IC202提供输出电压(或操纵电压)，它控制发射机VCO204。发射机压控振荡器204的输出被提供给激励放大器206，它向功放208提供驱动。发射机压控振荡器204的输出也反馈到平移IC202。
现翻到图3，示出根据本发明的发射机压控振荡器204的电路图。发射机VCO包括用于接收优选由微处理器103提供的波段选择电压、用于调整基-射极电容以使能放大器在适当的波段作为振荡器、且用于调整谐振电容以改变振荡器的谐振频率的节点。具体地，电感如带线电感304在晶体管302的基极被耦合到电容306。选择电感304和电容306的值，以使晶体管302能振荡在特定频段。例如，电感优选0.2mm宽和5mm长，同时电容306优选0.75pF。用零或负波段选择电压，二极管308保持未偏置，以隔离电容310和使能振荡于DCS 1800MHZ波段。
当发射机压控振荡器204要振荡在另一频段的频率，波段选择电压被改变，以偏置二极管308。通过施加正波段选择电压，二极管308导通，因此耦合电容310，它优选5.6pF，与电容306并联。因此，基-射极反馈通道的电容现在由电感304和并联电容306和310确定。因为由并联电容产生的电容变化，晶体管振荡在GSM 900MHZ波段。
类似地，波段选择电压被耦合到第二二极管320，以通过耦合/不耦合第二电容322，使其并联于串联的可变电容328与电容324，来调整振荡器的谐振频率。对于DCS 1800MHZ运行，零或负波段选择电压将不偏置二极管320。因为电容322被隔离，振荡器的谐振频率由电感326和串联的电容324和可变电容328的电容决定。用有宽0.2mm长4mm的微带电感326，和5.6pF电容值的电容324和约4pF的可变电容328，根据操纵电压，晶体管将振荡在1800MHZ波段。
对于GSM 900MHZ运行，正波段选择电压偏置二极管320导通。因此，振荡器的谐振频率由电感326和串联电容322和327与串联电容324和可变电容328相并联的电容决定。用15pF电容的可变电容327和10pF电容322，晶体管将振荡在GSM 900MHZ波段。最后，操纵电压被加于可变电压电容327和328，以在选择的波段内改变谐振频率。
虽然上文及图描绘了本发明，应知道，这仅给出示例，不超出本发明的真实精神和范围，本领域的技术人员能作出改进与修改。虽然本发明在便携蜂窝电话中有具体应用，本发明能用于任何便携装置，包括寻呼机，电子组织者或计算机。本发明由下列权利要求限定。

Claims (9)

1.发射射频信号的装置，包括压控振荡器，所述压控振荡器包括：
晶体管，用于产生谐振输出信号，所述晶体管有基极、集电极和射极；
第一电感和第一电容，耦合到所述晶体管的基极；
第一控制节点，耦合以接收波段选择电压，所述波段选择电压有选择地耦合第二电容到所述基极和所述射极，用于调整所述输出信号的波段；和
第二控制节点，耦合以接收一个波段选择电压，用于有选择地耦合第三电容到电路中，用于调整所述谐振输出信号。
2.如权利要求1所述的装置，其中，所述第二电容有选择地与所述第一电容并联耦合，用于改变所述谐振输出信号的所述波段。
3.如权利要求1所述的装置，还包括第四电容，耦合到电感且与第三电容并联耦合。
4.如权利要求1所述的装置，该装置的压控振荡器还包括耦合到上述第三电容与第四电容的调整电压输入端，用于接收在所选择的波段中改变谐振频率的电压。
5.产生可变振荡输出信号的方法，所述方法包括步骤：
使用一个晶体管来产生振荡输出信号；
接收第一波段选择电压；
有选择地耦合第一电容到所述晶体管的基极，用于响应所述第一波段选择电压调整所述振荡输出信号的频段；
有选择地耦合第二电容，用于改变所述振荡输出信号的频率波段。
6.如权利要求5所述的产生可变振荡输出信号的方法，还包括以下步骤：接收调整电压输入，用于改变所选择的频率波段中的谐振频率。
7.如权利要求5所述的产生可变振荡输出信号的方法，还包括步骤：接收第二波段选择电压。
8.如权利要求6所述的产生可变振荡输出信号的方法，还包括步骤：响应所述第二波段选择电压，不耦合所述第一电容。
9.如权利要求7所述的产生可变振荡输出信号的方法，还包括步骤：响应所述第二波段选择电压，不耦合所述第二电容。
CN98104474.3A 1997-02-19 1998-02-18 发射射频信号的方法和装置 Expired - Fee Related CN1092425C (zh)

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US08/802,832 US5892410A (en) 1997-02-19 1997-02-19 Method and apparatus for transmitting radio frequency signals
US802832 1997-02-19

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CN1191423A CN1191423A (zh) 1998-08-26
CN1092425C true CN1092425C (zh) 2002-10-09

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JP (1) JPH10242754A (zh)
CN (1) CN1092425C (zh)
DE (1) DE19806097B4 (zh)
FR (1) FR2760150B1 (zh)
GB (1) GB2324918B (zh)

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WO1999039447A2 (en) * 1998-01-29 1999-08-05 Koninklijke Philips Electronics N.V. Global tuner
US6127900A (en) * 1998-09-30 2000-10-03 Conexant Systems, Inc. Dual frequency synthesis system
CN1339199A (zh) * 1999-02-03 2002-03-06 西门子公司 集成的天线耦合元件
US6912376B1 (en) 1999-12-27 2005-06-28 Texas Instruments Incorporated Mobile phone transceiver
DE102006009467A1 (de) * 2006-03-01 2007-09-06 Rohde & Schwarz Gmbh & Co. Kg Oszillator mit mitgeführtem Verstärker
US8695344B2 (en) * 2008-10-27 2014-04-15 Kalex, Llc Systems, methods and apparatuses for converting thermal energy into mechanical and electrical power

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JPS5922404A (ja) * 1982-07-28 1984-02-04 Hitachi Denshi Ltd 電圧制御発振器
JPS59149405A (ja) * 1983-02-16 1984-08-27 Matsushita Electric Ind Co Ltd 局部発振装置
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JPH08148933A (ja) * 1994-11-22 1996-06-07 Murata Mfg Co Ltd 電圧制御型発振器

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JPH10242754A (ja) 1998-09-11
MX9801326A (es) 1998-08-30
DE19806097B4 (de) 2006-01-26
FR2760150B1 (fr) 2000-07-07
GB2324918B (en) 2001-04-04
FR2760150A1 (fr) 1998-08-28
US5892410A (en) 1999-04-06
GB2324918A (en) 1998-11-04
DE19806097A1 (de) 1998-08-20
CN1191423A (zh) 1998-08-26
GB9801293D0 (en) 1998-03-18

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