System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS
First Claim
1. A system comprising:
- a clock module configured to generate a first clock reference;
a global positioning system (GPS) module configured to operate in response to the first clock reference;
a first module configured to, in response to an automatic frequency correction signal, (i) generate a second clock reference by performing automatic frequency correction on the first clock reference, and (ii) generate a third clock reference by performing automatic frequency correction on the first clock reference;
a second module configured to (i) receive radio frequency signals from a wireless medium, and (ii) in response to the third clock reference, generate baseband signals based on the received radio frequency signals; and
a third module configured to (i) receive the baseband signals, and (ii) in response to a selected one of the first clock reference and the second clock reference, generate the automatic frequency correction signal based on the baseband signals.
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0 Petitions
Accused Products
Abstract
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.
15 Citations
24 Claims
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1. A system comprising:
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a clock module configured to generate a first clock reference; a global positioning system (GPS) module configured to operate in response to the first clock reference; a first module configured to, in response to an automatic frequency correction signal, (i) generate a second clock reference by performing automatic frequency correction on the first clock reference, and (ii) generate a third clock reference by performing automatic frequency correction on the first clock reference; a second module configured to (i) receive radio frequency signals from a wireless medium, and (ii) in response to the third clock reference, generate baseband signals based on the received radio frequency signals; and a third module configured to (i) receive the baseband signals, and (ii) in response to a selected one of the first clock reference and the second clock reference, generate the automatic frequency correction signal based on the baseband signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification