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1. 发明申请

US20070019109A1 Method and apparatus for frequency synthesis in direct-conversion transmitters 有权
标题翻译：直接转换发射机频率合成方法及装置
公开(公告)号：US20070019109A1
公开(公告)日：2007-01-25
申请号：US11186380
申请日：2005-07-21
申请人： Frank Lombardi , John Freed , Martin Isberg
发明人： Frank Lombardi , John Freed , Martin Isberg
IPC分类号： H03L7/00
CPC分类号： H04B1/30 , H03C3/0966 , H03C3/0983 , H03C5/00 , H03L7/185 , H03L7/1974 , H03L7/23
摘要： A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal to obtain an intermediate frequency reference signal, generates the transmit frequency signal by using the mixing frequency signal to downconvert the transmit frequency signal into an intermediate frequency feedback signal, and phase-locks the intermediate frequency feedback signal to the intermediate frequency reference signal. The transmit frequency signal may be phase modulated, and may serve as an input to a saturated-mode power amplifier that can be configured for corresponding amplitude modulation. Alternatively, the un-modulated transmit frequency signal serves as the carrier signal input to a quadrature modulator, which imparts I/Q modulations to it, thereby producing a modulated carrier signal for input to a linear power amplifier.
摘要翻译：用于直接转换传输的方法和装置产生与发射频率信号非谐波相关的第一频率信号，分频第一频率信号以获得混频信号，分频第一频率信号以获得中频参考信号通过使用混频信号来生成发送频率信号，以将发送频率信号下变频成中频反馈信号，并将中频反馈信号相位锁定到中频参考信号。发射频率信号可以是相位调制的，并且可以用作可以被配置用于对应的幅度调制的饱和模式功率放大器的输入。或者，未调制的发送频率信号用作输入到正交调制器的载波信号，其向其施加I / Q调制，从而产生用于输入到线性功率放大器的调制载波信号。

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