发明授权
US07288999B1 Pre-distortion system for a synthesizer having modulation applied in the reference path
有权
具有在参考路径中应用的调制的合成器的预失真系统
- 专利标题: Pre-distortion system for a synthesizer having modulation applied in the reference path
- 专利标题(中): 具有在参考路径中应用的调制的合成器的预失真系统
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申请号: US11347956申请日: 2006-02-06
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公开(公告)号: US07288999B1公开(公告)日: 2007-10-30
- 发明人: Alexander Wayne Hietala , Ryan Lee Bunch , Scott Robert Humphreys , Barry Travis Hunt, Jr.
- 申请人: Alexander Wayne Hietala , Ryan Lee Bunch , Scott Robert Humphreys , Barry Travis Hunt, Jr.
- 申请人地址: US NC Greensboro
- 专利权人: RF Micro Devices, Inc.
- 当前专利权人: RF Micro Devices, Inc.
- 当前专利权人地址: US NC Greensboro
- 代理机构: Withrow & Terranova, PLLC
- 主分类号: H03L7/197
- IPC分类号: H03L7/197 ; H04L25/49
摘要:
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.