公开(公告)号：US20150073739A1

公开(公告)日：2015-03-12

申请号：US14020404

申请日：2013-09-06

Applicant: Analog Devices Technology

Inventor： Muhammad Kalimuddin Khan ,  Kenneth J. Mulvaney ,  Michale Deeney ,  Niall Kevin Kearney

IPC: G01R23/02

CPC classification number: G01R23/02 ,  H03L7/095 ,  H03L7/193 ,  H03L7/1974 ,  H03L7/1976

Abstract: A monitoring circuit for monitoring the performance of a phase locked loop having a divider therein, the divider comprising at least a first counter, the monitoring circuit comprising at least one memory element for capturing a value of the first counter after a predetermined time from a system event in the operation of the phase locked loop, a variability calculator for comparing a value of the counter with a preceding value of the counter to calculate a variation, and a circuit responsive to the estimate of variation for outputting a status signal.

Abstract translation: 一种用于监视其中具有分频器的锁相环的性能的监视电路，所述分频器包括至少第一计数器，所述分频器包括至少一个存储器元件，用于在来自系统的预定时间之后捕获所述第一计数器的值 可变性计算器，用于将计数器的值与计数器的先前值进行比较以计算变化;以及电路，其响应于用于输出状态信号的变化估计。

公开(公告)号：US09246669B2

公开(公告)日：2016-01-26

申请号：US14285415

申请日：2014-05-22

Applicant: Analog Devices Technology

Inventor： Muhammad Kalimuddin Khan ,  Philip E. Quinlan ,  Kenneth J. Mulvaney

IPC: H04L27/10 ,  H04L7/033

CPC classification number: H04L7/033 ,  H04L7/0083 ,  H04L7/046 ,  H04L7/10 ,  H04L27/0008 ,  H04L27/10 ,  H04L27/106

Abstract: Apparatus and method for acquiring and tracking a data signal are disclosed. Two different CDR circuits are configured to acquire and track data based on two different modulation schemes. While in the acquisition mode, the first CDR circuit may acquire data signal by sampling the signal at a reduced clock rate and handover to the second CDR circuit when a preamble is found. Also in the acquisition mode, the data acquisition and tracking circuit may determine the power level of the preamble signal and dynamically adjust the threshold level for the tracking period upon finding of the preamble.

Abstract translation: 公开了用于获取和跟踪数据信号的装置和方法。 两个不同的CDR电路被配置为基于两种不同的调制方案来获取和跟踪数据。 在采集模式中，第一CDR电路可以通过以降低的时钟速率对信号进行采样来获得数据信号，并且当发现前导码时切换到第二CDR电路。 同样在采集模式中，数据采集和跟踪电路可以确定前导码信号的功率电平，并且在寻找前导码时动态地调整跟踪周期的阈值电平。