发明名称 |
Systems and methods for correcting phase locked loop tracking error using feed-forward phase modulation |
摘要 |
Tracking error in phase locked loop (PLL) devices is addressed utilizing feed-forward phase modulation. Specifically, the phase difference of the reference signal and said oscillator signal of a PLL may be determined utilizing a phase detector. The output of the phase detector may be provided to a loop filter to provide feedback to the VCO of the PLL. Additionally, the filtered phase difference may be provided to a suitably calibrated phase modulator to add an amount of phase modulation to the oscillator signal that is approximately equal and opposite to said phase difference to generate a corrected phase output signal.
|
申请公布号 |
US6831491(B2) |
申请公布日期 |
2004.12.14 |
申请号 |
US20020328358 |
申请日期 |
2002.12.23 |
申请人 |
AGILENT TECHNOLOGIES, INC. |
发明人 |
KARLQUIST RICHARD K. |
分类号 |
G11B21/10;H03C3/00;H03C3/09;H03L7/08;H03L7/087;H04L7/033;(IPC1-7):H03L7/06 |
主分类号 |
G11B21/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|