Phase locked loop system and working method thereof
AssigneeIPGoal Microelectronics (SiChuan) Co., Ltd.
InventorFangping Fan
Life of this patent
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Abstract
A PLL system includes: an input end; an output end; a first PFD; a first CHP connected to the first PFD; a first LPF connected to the first CHP; a first VCO connected to the first CHP and the first LPF; a second PFD connected to the first VCO; a second CHP connected to the second PFD; a second LPF connected to the second CHP; a second VCO connected to the second CHP and the second LPF; a first DIV connected to the first PFD and the second VCO; and a second DIV connected to the second PFD and the second VCO. A working method of the PLL system is also provided, which can restrain input noise as well as phase noise of the second VOC in such a manner that noise of the PLL system is well restrained.
Claims8
A PLL system, comprising:
- an input end;
- a first PFD connected to said input end;
- a first CHP connected to said first PFD;
- a first LPF connected to said first CHP;
- a first VCO connected to said first CHP and said first LPF;
- a second PFD connected to said first VCO;
- a second CHP connected to said second PFD;
- a second LPF connected to said second CHP;
- a second VCO connected to said second CHP and said second LPF;
- an output end connected to said second VCO;
- a first DIV connected to said first PFD, said second VCO and said output end;
- and
- a second DIV connected to said second PFD, said second VCO and said output end.
A working method of a PLL system, wherein said PLL system comprises:
- an input end;
- a first PFD connected to said input end;
- a first CHP connected to said first PFD;
- a first LPF connected to said first CHP;
- a first VCO connected to said first CHP and said first LPF;
- a second PFD connected to said first VCO;
- a second CHP connected to said second PFD;
- a second LPF connected to said second CHP;
- a second VCO connected to said second CHP and said second LPF;
- an output end connected to said second VCO;
- a first DIV connected to said first PFD, said second VCO and said output end;
- and
- a second DIV connected to said second PFD, said second VCO and said output end.
Dependencies are inferred from the claim text.