Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2005-11-01
2005-11-01
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S156000
Reexamination Certificate
active
06960947
ABSTRACT:
A fractional-type phase-locked loop circuit, for synthesizing an output signal multiplying a frequency of a reference signal by a selected fractional conversion factor, includes a frequency divider for generating a feedback signal dividing the frequency of the output signal by a frequency division factor selectable among at least two different integer-value division factors, and frequency divider control means for causing the frequency division factor to vary between the at least two integer-value division factors in a pre-defined number of cycles, thereby an average frequency division factor over said pre-defined number of cycles has a fractional value. Means are provided for compensating a phase error introduced by the frequency divider on the basis of a value indicative of the phase error obtained from said frequency divider control means. The phase-error compensation means includes rounding means, receiving an input binary code with a first number of binary digits, indicative of the phase error value, and providing an output binary code, with a second number of binary digits lower than the first number of digits, defining a rounded phase error value.
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European Search Report dated Sep. 1, 2003 relating to the above prior art.
Albasini Guido Gabriele
Milani Enrico Temporiti
Born P. G. Scott
Graybeal Jackson Haley LLP
Jorgenson Lisa K.
Nguyen Linh My
STMicroelectronics S.r.l.
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