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    A mobile radiotelephone
    3.
    发明公开
    A mobile radiotelephone 失效
    手机

    公开(公告)号：EP1315283A3

    公开(公告)日：2004-03-31

    申请号：EP02019254.8

    申请日：1994-04-21

    申请人： Nokia Corporation

    发明人： Mattila, Heikki ,  Matero, Jorma ,  Hulkko, Jaakko

    IPC分类号： H03C3/40 ,  H04B1/40

    CPC分类号： H03C3/40 ,  H03C3/00 ,  H03D7/163

    摘要： A dual-mode radiotelephone terminal includes a π/4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset oscillator (18) to form an injection signal (LO) at a final transmitter frequency, the injection signal being further modulated with a quadrature modulator in a digital mode of operation. In the analog mode of operation the transmitter oscillator or offset oscillator is frequency modulated and the quadrature modulator is disabled, thereby passing the frequency modulated injection signal without substantial attenuation. The LO signal is regenerated and also phase shifted with a circuit (35) having a frequency multiplier (30) and a frequency divider (34). The circuit outputs two local oscillator (LO) signals (LOA and LOB), each of which directly drives an associated quadrature mixer (36, 38) of the modulator. In a further embodiment of the invention the dual-mode radiotelephone terminal includes a VHF synthesizer (23), a UHF synthesizer (21), and a local oscillator (4C) that provides a signal only when operating in the analog receiving mode. The local oscillator signal is mixed with a first IF signal for providing a second IF signal when operating in the analog receiving mode or in a standby mode. The first IF frequency is provided by a standard IF filter (45 MHz) when operating in either the digital or the analog mode of operation. The output of the VHF synthesizer is divided (22) and used as an input to a mixer (4F) that provides a second IF signal when operating in the digital receiving mode. A control signal is employed for selectively enabling and disabling various of these components as a function of the operating mode, thereby conserving power.

    A mobile radiotelephone
    4.
    发明公开
    A mobile radiotelephone 失效
    移动无线电话

    公开(公告)号：EP1315283A2

    公开(公告)日：2003-05-28

    申请号：EP02019254.8

    申请日：1994-04-21

    申请人： Nokia Corporation

    发明人： Mattila, Heikki ,  Matero, Jorma ,  Hulkko, Jaakko

    IPC分类号： H03C3/40

    CPC分类号： H03C3/40 ,  H03C3/00 ,  H03D7/163

    摘要： A dual-mode radiotelephone terminal includes a π/4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset oscillator (18) to form an injection signal (LO) at a final transmitter frequency, the injection signal being further modulated with a quadrature modulator in a digital mode of operation. In the analog mode of operation the transmitter oscillator or offset oscillator is frequency modulated and the quadrature modulator is disabled, thereby passing the frequency modulated injection signal without substantial attenuation. The LO signal is regenerated and also phase shifted with a circuit (35) having a frequency multiplier (30) and a frequency divider (34). The circuit outputs two local oscillator (LO) signals (LOA and LOB), each of which directly drives an associated quadrature mixer (36, 38) of the modulator. In a further embodiment of the invention the dual-mode radiotelephone terminal includes a VHF synthesizer (23), a UHF synthesizer (21), and a local oscillator (4C) that provides a signal only when operating in the analog receiving mode. The local oscillator signal is mixed with a first IF signal for providing a second IF signal when operating in the analog receiving mode or in a standby mode. The first IF frequency is provided by a standard IF filter (45 MHz) when operating in either the digital or the analog mode of operation. The output of the VHF synthesizer is divided (22) and used as an input to a mixer (4F) that provides a second IF signal when operating in the digital receiving mode. A control signal is employed for selectively enabling and disabling various of these components as a function of the operating mode, thereby conserving power.

    摘要翻译： 双模式无线电话终端包括π/ 4移位DQPSK调制器（11）。 通过将发射器振荡器（16）的输出与偏置振荡器（18）的输出混合以形成最终发射器频率处的注入信号（LO）来实现双模调制，该注入信号进一步用 正交调制器处于数字操作模式。 在模拟操作模式中，发射器振荡器或偏移振荡器被频率调制，并且正交调制器被禁用，从而传递频率调制的注入信号而没有实质的衰减。 LO信号被再生并且还被具有倍频器（30）和分频器（34）的电路（35）相移。 该电路输出两个本地振荡器（LO）信号（LOA和LOB），其中的每一个直接驱动调制器的相关正交混频器（36,38）。 在本发明的另一个实施例中，双模无线电话终端包括VHF合成器（23），UHF合成器（21）和只在工作于模拟接收模式时才提供信号的本地振荡器（4C）。 当工作在模拟接收模式或待机模式时，本地振荡器信号与第一IF信号混合以提供第二IF信号。 当工作在数字或模拟工作模式时，第一个IF频率由标准IF滤波器（45 MHz）提供。 VHF合成器的输出被分频（22），并用作混频器（4F）的输入，当工作在数字接收模式时，该混频器提供第二个IF信号。 采用控制信号来根据操作模式选择性地启用和禁用这些组件中的各种组件，从而节约电力。