Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Reexamination Certificate
2004-12-15
2010-11-23
Dao, Minh D (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
C455S076000, C455S118000, C455S123000, C375S344000, C331S018000
Reexamination Certificate
active
07840189
ABSTRACT:
A wireless communication device comprises a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage-controlled oscillator. The fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage-controlled oscillator. An automatic frequency control scaling sub-system is operably coupled to a fractional-based synthesiser and configured to receive and use an AFC word to frequency scale the fractional value in a multiplicative manner to set a radio frequency supported by the fractional-based synthesiser. Preferably, an automatic frequency generation sub-system utilises Absolute Radio Frequency Channel Number and the cyclical nature of the fractional value.In this manner, a saving on hardware and software overheads associated with frequency channel selection for fractional-N type synthesizers can be made.
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Kelleher Paul
O'Keeffe Conor
Dao Minh D
Freescale Semiconductor Inc.
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