- 专利标题: Nested cascaded mixed-radix digital delta-sigma modulator
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申请号: US16117361申请日: 2018-08-30
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公开(公告)号: US10560111B2公开(公告)日: 2020-02-11
- 发明人: Hongjia Mo , Michael Peter Kennedy
- 申请人: University College Cork—National University of Ireland, Cork
- 申请人地址: IE Cork
- 专利权人: University College Cork-National University of Ireland, Cork
- 当前专利权人: University College Cork-National University of Ireland, Cork
- 当前专利权人地址: IE Cork
- 代理机构: Knobbe, Martens, Olson & Bear, LLP
- 主分类号: H03L7/197
- IPC分类号: H03L7/197 ; H03M7/36 ; H03M3/00 ; H03L7/093
摘要:
A nested mixed-radix DDSM can guarantee zero systematic frequency error when used as a divider controller in a fractional-N frequency synthesizer is described. This disclosure presents a nested cascaded mixed-radix DDSM architecture which can also guarantee zero systematic frequency error. In addition, the disclosure allows one to use higher order auxiliary modulators and shaped dither signal to eliminate feedthrough spurs completely. By increasing the number of levels in the cascade, the moduli of the individual modulator stages can be reduced, thereby increasing the speed of the synthesizer.
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