Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2005-05-17
2005-05-17
Chin, Stephen (Department: 2634)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C455S208000, C455S076000, C331S045000, C331S017000, C329S308000
Reexamination Certificate
active
06895063
ABSTRACT:
A zero or near zero IF frequency changer for use in a digital tuner comprises multipliers which receive the RF input signal from an input. The multipliers receive quadrature local oscillator signals from a first oscillator of an arrangement which comprises first and second phase-locked loops. The first phase-locked loop comprises a programmable divider, a comparator and a control loop so that the first oscillator is phase-locked to a second oscillator. A second phase-locked loop comprises the second oscillator and a synthesizer containing a reference oscillator to which the second oscillator is phase-locked. The output frequency of the second oscillator is in a frequency band which is outside the RF input frequency band of the frequency changer.
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Cowley Nicholas P
Mudd Mark S. J
Chin Stephen
Kirschstein et al.
Pathak Sudhanshu C.
Zarlink Semiconductor Limited
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