Fractional-N frequency synthesizer

Details Fractional-N frequency synthesizer Fractional-N frequency synthesizer

2011-06-28

2011-06-28

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S007000, C327S012000

Reexamination Certificate

active

07969202

ABSTRACT:
A circuit, with applications to phase-locked loops and frequency synthesis, where a divider circuit shuffles between dividing the output of a voltage-controlled oscillator by N or N+1, where N is an integer, and where a phase frequency detector provides three logic signals to a charge pump so that one of three values of current may be sourced to a loop filter, with the result that the circuit behaves as a conventional phase-locked loop having a fictitious divider circuit that is capable of dividing the output of the voltage-controlled oscillator by a non-integral value.

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