Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2011-04-12
2011-04-12
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S147000, C327S105000
Reexamination Certificate
active
07924072
ABSTRACT:
A PLL-based frequency translator provides a divider augmented with a sigma delta modulator (SDM) in a reference path. The system may include two primary functional blocks—an input PLL with its reference path containing an integer divider coupled with a SDM (a fractional frequency divider), and an output PLL with its feedback path containing an integer divider coupled with a SDM (a fractional frequency multiplier). The combination of an integer divider and an SDM yields a fractional divider that divides by N+F/M, where N is the integer portion of the division and F/M is the fractional portion of the division, with M denoting the fractional modulus. Furthermore, since it is desirable to have programmable division factors, it is beneficial to define N, F and M as integers as this simplifies a programming interface when the frequency translator is manufactured as an integrated circuit.
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Gentile Kenny
Palmer Wyn Terence
Analog Devices Inc.
Donovan Lincoln
Jager Ryan C
Kenyon & Kenyon LLP
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