Pre-distortion system for a synthesizer having modulation applied in the reference path
US7288999B1 · kind B1 · utility
3Cited by
3References
21Claims
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Key dates
| Filing date | Feb 6, 2006 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | May 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.