发明名称 |
Feedback for delay lock loop |
摘要 |
The present invention is directed to signal processing system and electrical circuits. More specifically, embodiments of the present invention provide a DLL system that provides phase correction by determining a system offset based on phase differences among the delay lines. The offset is used as a part of a feedback loop to provide phase corrections for the delay lines. There are other embodiments as well. |
申请公布号 |
US8901977(B1) |
申请公布日期 |
2014.12.02 |
申请号 |
US201414321602 |
申请日期 |
2014.07.01 |
申请人 |
Inphi Corporation |
发明人 |
Ren Guojun |
分类号 |
H03L7/06;H03L7/08 |
主分类号 |
H03L7/06 |
代理机构 |
Ogawa P.C. |
代理人 |
Ogawa Richard T.;Ogawa P.C. |
主权项 |
1. A delay-lock loop system comprising:
a phase detector configured to generate an up signal and a down signal based on a reference clock signal and a feedback clock signal; a charge pump configured to generate a reference voltage using the up signal and the down signal from the phase detection; a voltage regulator configured to generate a drive voltage based on the reference voltage; and a delay module having N delay lines, the N delay lines having a first delay line D0 and a last delay line Dn-1, the delay module being configured to provide a positive current compensation value and a negative current compensation value using a first common feedback structure, the first common feedback structure having a first input based on the phase difference between the first delay line D0 and the last delay line Dn-1 and a second input based on two adjacent delay lines of the N delay lines. |
地址 |
Santa Clara CA US |