System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS

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.