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System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS
System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS
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机译:系统和收发器时钟,以最大限度地减少多功能蜂窝应用(包括GPS)中所需的参考源数量
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摘要
A system includes a first clock module, a global positioning system (GPS) module, a phase-locked loop (PLL) module, a cellular transceiver, and a baseband module. The first clock module generates a first clock reference. The GPS module operates in response to the first clock reference. The WLAN module operates in response to the first clock reference. The PLL module generates a second clock reference by performing automatic frequency correction (AFC) on the first clock reference in response to an AFC signal. The cellular transceiver receives radio frequency signals from a wireless medium and generates baseband signals in response to the received radio frequency signals. The baseband module receives the baseband signals, operates in response to a selected one of the first clock reference and the second clock reference, and generates the AFC signal in response to the baseband signals.
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