Pre-distortion system for a synthesizer having modulation...

Details Pre-distortion system for a synthesizer having modulation... Pre-distortion system for a synthesizer having modulation...

2007-10-30

2007-10-30

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C332S127000, C377S048000, C375S296000

Reexamination Certificate

active

11347956

ABSTRACT:
A system providing a phase or frequency modulated signal is provided. In general, the system includes a phase locked loop (PLL) having a fractional-N divider in a reference path of the PLL operating to divide a reference frequency based on a pre-distorted modulation signal. Pre-distortion circuitry operates to provide the pre-distorted modulation signal by pre-distorting a modulation signal such that a convolution, or cascade, of the pre-distortion and a transfer function of the PLL results in a substantially flat frequency response for a range of modulation rates greater than a bandwidth of the PLL.

REFERENCES:
patent: 6008703 (1999-12-01), Perrott et al.
patent: 6396355 (2002-05-01), Rezin
patent: 6834084 (2004-12-01), Hietala
patent: 2005/0175137 (2005-08-01), Khlat
patent: 2006/0055466 (2006-03-01), Hirano et al.
patent: 2006/0197613 (2006-09-01), Bunch et al.

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