公开(公告)号：US08111785B2

公开(公告)日：2012-02-07

申请号：US12372946

申请日：2009-02-18

申请人： Viet Linh Do ,  Philip Michael Clovis ,  Michael Hellmer ,  Mehmet Mustafa Eker ,  Hongming An ,  Simon Pang

发明人： Viet Linh Do ,  Philip Michael Clovis ,  Michael Hellmer ,  Mehmet Mustafa Eker ,  Hongming An ,  Simon Pang

IPC分类号： H03D3/18 ,  H03D3/24 ,  H04L7/00

CPC分类号： H04L7/0331 ,  H03L7/0891 ,  H03L7/095 ,  H03L7/113 ,  H03L7/1976 ,  H04L7/0004

摘要： A system and method are provided for automatic frequency acquisition maintenance in a clock and data recovery (CDR) device. In an automatic frequency acquisition (AFA) mode, the method uses a phase detector (PHD) to acquire the phase of a non-synchronous input communication signal having an initial first frequency. In the event of a loss of lock/loss of signal (LOL/LOS) signal being asserted, a frequency ratio value is retrieved from memory. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a synthesized signal is generated. In response to using the PFD to generate the synthesized signal and the LOL/LOS signal being deasserted, a rotational frequency detector (RFD) is used to generate a synthesized signal having a frequency equal to the frequency of the input communication signal. With the continued deassertion of the LOL/LOS signal, the PHD is enabled and the phase of the input signal is acquired.

摘要翻译： 提供了一种用于时钟和数据恢复（CDR）设备中的自动频率采集维护的系统和方法。 在自动频率采集（AFA）模式中，该方法使用相位检测器（PHD）来获取具有初始第一频率的非同步输入通信信号的相位。 在信号失去锁定/丢失（LOL / LOS）信号被断言的情况下，从存储器检索频率比值。 使用相位频率检测器（PFD），参考信号和频率比值，产生合成信号。 响应于使用PFD产生合成信号并且LOL / LOS信号被无效，旋转频率检测器（RFD）用于产生具有等于输入通信信号频率的频率的合成信号。 随着LOL / LOS信号的持续消除，PHD被使能，并且获取输入信号的相位。

公开(公告)号：US20090147904A1

公开(公告)日：2009-06-11

申请号：US12388024

申请日：2009-02-18

申请人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

发明人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

IPC分类号： H04L7/00

CPC分类号： H04L7/0004 ,  H03L7/0891 ,  H03L7/113 ,  H03L7/1976 ,  H04L7/033

摘要： A system and method are provided for frequency lock stability in a receiver using overlapping voltage controlled oscillator (VCO) bands. An input communication signal is accepted and an initial VCO is selected. Using a phase-locked loop (PLL) and the initial VCO, the frequency of the input communication signal is acquired and the acquired signal tuning voltage of the initial VCO is measured. Then, the initial VCO is disengaged and a plurality of adjacent band VCOs is sequentially engaged. The acquired signal tuning voltage of each VCO is measured and a final VCO is selected that is able to generate the input communication signal frequency using an acquired signal tuning voltage closest to a midpoint of a predetermined tuning voltage range.

摘要翻译： 提供了一种用于使用重叠压控振荡器（VCO）频带的接收机中的频率锁定稳定性的系统和方法。 接受输入通信信号并选择初始VCO。 使用锁相环（PLL）和初始VCO，获取输入通信信号的频率，并测量初始VCO的采集信号调谐电压。 然后，初始VCO被分离并且多个相邻频带VCO被顺序地接合。 测量每个VCO的获取的信号调谐电压，并且选择能够使用最接近预定调谐电压范围的中点的获取的信号调谐电压来产生输入通信信号频率的最终VCO。

公开(公告)号：US20090122935A1

公开(公告)日：2009-05-14

申请号：US11983675

申请日：2007-11-09

申请人： Simon Pang ,  Viet Linh Do ,  Mehmet Mustafa Eker

发明人： Simon Pang ,  Viet Linh Do ,  Mehmet Mustafa Eker

IPC分类号： H04L7/02

CPC分类号： H04L7/0083 ,  H03L7/095 ,  H03L2207/14 ,  Y10S331/02

摘要： A system and method are provided for detecting a false clock frequency lock in a clock and data recovery (CDR) device. The method accepts a digital raw data signal at a first rate and counts edge transitions in the raw data signal, creating a raw count. A clock signal is also accepted at a second rate. The clock signal is a timing reference recovered from the raw data signal. The raw data signal is sampled at a rate responsive to the clock signal, generating a sampled signal. Edge transitions are counted in the sampled signal, creating a sampled count. Then, the raw count is compared to the sampled count, to determine if the first rate is equal to the second rate. The method is used to determine if the second rate is less than the first rate—to detect if the clock signal is incorrectly locked to the first rate.

摘要翻译： 提供了用于检测时钟和数据恢复（CDR）设备中的假时钟频率锁定的系统和方法。 该方法以第一速率接收数字原始数据信号，并计算原始数据信号中的边沿转换，创建原始计数。 时钟信号也以第二速率被接受。 时钟信号是从原始数据信号恢复的定时参考。 原始数据信号以响应于时钟信号的速率被采样，产生采样信号。 在采样信号中计数边沿转换，创建采样计数。 然后，将原始计数与采样计数进行比较，以确定第一速率是否等于第二速率。 该方法用于确定第二速率是否小于第一速率 - 以检测时钟信号是否被错误地锁定到第一速率。

公开(公告)号：US20080112525A1

公开(公告)日：2008-05-15

申请号：US11595012

申请日：2006-11-09

申请人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

发明人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

IPC分类号： H03D3/24

CPC分类号： H03L7/113 ,  H03L7/093 ,  H03L7/0995 ,  H03L7/1974 ,  H04L7/033 ,  H04L7/0331

摘要： A system and method are provided for automatically acquiring a serial data stream clock. The method receives a serial data stream with an unknown clock frequency and coarsely determines the clock frequency. The frequency is coarsely determined by (initially) selecting a high frequency first reference clock (Fref1), and counting the number of data transitions in a first time segment of the serial data stream at a plurality of sample frequencies equal to Fref1/n, where n is an integer ≧1. The count for each sampling frequency is compared to the count for Fref1 (n=1). Next, the highest sampling frequency (n=x) is determined, which has a lower count than Fref1, and the coarse clock frequency is set to Fc1=Fref1/(x−1).

摘要翻译： 提供了一种用于自动获取串行数据流时钟的系统和方法。 该方法接收到具有未知时钟频率的串行数据流，并粗略地确定时钟频率。 通过（最初）选择高频第一参考时钟（Fref 1）粗略地确定频率，并且以等于Fref 1 / n的多个采样频率对串行数据流的第一时间段中的数据转换次数进行计数 ，其中n是整数> = 1。 将每个采样频率的计数与Fref 1（n = 1）的计数进行比较。 接下来，确定最高采样频率（n = x），其具有比Fref 1更低的计数，并且粗略时钟频率被设置为Fc 1 = Fref 1 /（x-1）。

公开(公告)号：US08346840B2

公开(公告)日：2013-01-01

申请号：US11954325

申请日：2007-12-12

申请人： Viet Linh Do ,  Simon Pang

发明人： Viet Linh Do ,  Simon Pang

IPC分类号： G06F7/52

CPC分类号： G06F7/535 ,  G06F2207/5353

摘要： A system and method are provided for rational division. The method accepts accepting a binary numerator and a binary denominator. A binary first sum is created of the numerator and a binary first count from a previous cycle. A binary first difference is created between the first sum and the denominator. In response to comparing the first sum with the denominator, and first carry bit is generated and added to a first binary sequence. The first binary sequence is used to generate a k-bit quotient. Typically, the denominator value is larger than the numerator value. In one aspect, the numerator and denominator form a rational number. Alternately, the numerator may be an n-bit bit value formed as either a repeating or non-repeating sequence, and the denominator is an (n+1)-bit number with a decimal value of 2(n+1).

摘要翻译： 提供了一种合理划分的系统和方法。 该方法接受接受二进制分子和二进制分母。 由分子创建二进制第一和，并从上一个循环创建二进制第一个计数。 在第一个总和和分母之间创建二进制的第一个差异。 响应于将第一和与分母进行比较，并且生成第一进位位并将其相加到第一二进制序列。 第一个二进制序列用于生成k比特商。 通常，分母值大于分子值。 一方面，分子和分母形成一个有理数。 或者，分子可以是形成为重复序列或非重复序列的n位比特值，分母是小数值为2（n + 1）的（n + 1）位数字。

公开(公告)号：US08094754B2

公开(公告)日：2012-01-10

申请号：US12327776

申请日：2008-12-03

申请人： Mehmet Mustafa Eker ,  Simon Pang ,  Viet Linh Do ,  Hongming An ,  Philip Michael Clovis

发明人： Mehmet Mustafa Eker ,  Simon Pang ,  Viet Linh Do ,  Hongming An ,  Philip Michael Clovis

IPC分类号： H03D3/24

CPC分类号： H04L7/033 ,  H03L7/087 ,  H03L7/10 ,  H03L7/1976 ,  H03L7/22

摘要： A system and method are provided for holding the frequency of a non-synchronous communication signal in a clock and data recovery (CDR) device frequency synthesizer. The method initially acquires the phase of a non-synchronous first communication signal having a first frequency, and divides a first synthesized signal by a selected frequency ratio value, creating a frequency detection signal having a frequency equal to a reference signal frequency. In response to losing the first communication signal and subsequently receiving a second communication signal with a non-predetermined second frequency, the frequency ratio value is retrieved from memory based upon the assumption that the second frequency is the same, or close to the first frequency. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a second synthesized signal is generated having an output frequency equal to first frequency. Using a rotational frequency detector (RFD), the second communication signal, and the second synthesized signal, a second synthesized signal is generated having an output frequency equal to second frequency.

摘要翻译： 提供了一种用于在时钟和数据恢复（CDR）设备频率合成器中保持非同步通信信号的频率的系统和方法。 该方法最初获取具有第一频率的非同步第一通信信号的相位，并且将第一合成信号除以所选频率比值，产生频率等于参考信号频率的频率检测信号。 响应于丢失第一通信信号并随后接收具有非预定第二频率的第二通信信号，基于第二频率相同或接近第一频率的假设，从存储器检索频率比值。 使用相位频率检测器（PFD），参考信号和频率比值，产生具有等于第一频率的输出频率的第二合成信号。 使用旋转频率检测器（RFD），第二通信信号和第二合成信号，生成具有等于第二频率的输出频率的第二合成信号。

公开(公告)号：US20090147901A1

公开(公告)日：2009-06-11

申请号：US12372946

申请日：2009-02-18

申请人： Viet Linh Do ,  Philip Michael Clovis ,  Michael Hellmer ,  Mehmet Mustafa Eker ,  Hongming An ,  Simon Pang

发明人： Viet Linh Do ,  Philip Michael Clovis ,  Michael Hellmer ,  Mehmet Mustafa Eker ,  Hongming An ,  Simon Pang

IPC分类号： H04L7/00

CPC分类号： H04L7/0331 ,  H03L7/0891 ,  H03L7/095 ,  H03L7/113 ,  H03L7/1976 ,  H04L7/0004

摘要： A system and method are provided for automatic frequency acquisition maintenance in a clock and data recovery (CDR) device. In an automatic frequency acquisition (AFA) mode, the method uses a phase detector (PHD) to acquire the phase of a non-synchronous input communication signal having an initial first frequency. In the event of a loss of lock/loss of signal (LOL/LOS) signal being asserted, a frequency ratio value is retrieved from memory. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a synthesized signal is generated. In response to using the PFD to generate the synthesized signal and the LOL/LOS signal being deasserted, a rotational frequency detector (RFD) is used to generate a synthesized signal having a frequency equal to the frequency of the input communication signal. With the continued deassertion of the LOL/LOS signal, the PHD is enabled and the phase of the input signal is acquired.

摘要翻译： 提供了一种用于时钟和数据恢复（CDR）设备中的自动频率采集维护的系统和方法。 在自动频率采集（AFA）模式中，该方法使用相位检测器（PHD）来获取具有初始第一频率的非同步输入通信信号的相位。 在信号失去锁定/丢失（LOL / LOS）信号被断言的情况下，从存储器检索频率比值。 使用相位频率检测器（PFD），参考信号和频率比值，产生合成信号。 响应于使用PFD产生合成信号并且LOL / LOS信号被无效，旋转频率检测器（RFD）用于产生具有等于输入通信信号频率的频率的合成信号。 随着LOL / LOS信号的持续消除，PHD被使能，并且获取输入信号的相位。

公开(公告)号：US20090092213A1

公开(公告)日：2009-04-09

申请号：US12327776

申请日：2008-12-03

申请人： Mehmet Mustafa Eker ,  Simon Pang ,  Viet Linh Do ,  Hongming An ,  Philip Michael Clovis

发明人： Mehmet Mustafa Eker ,  Simon Pang ,  Viet Linh Do ,  Hongming An ,  Philip Michael Clovis

IPC分类号： H04L7/04

CPC分类号： H04L7/033 ,  H03L7/087 ,  H03L7/10 ,  H03L7/1976 ,  H03L7/22

摘要： A system and method are provided for holding the frequency of a non-synchronous communication signal in a clock and data recovery (CDR) device frequency synthesizer. The method initially acquires the phase of a non-synchronous first communication signal having a first frequency, and divides a first synthesized signal by a selected frequency ratio value, creating a frequency detection signal having a frequency equal to a reference signal frequency. In response to losing the first communication signal and subsequently receiving a second communication signal with a non-predetermined second frequency, the frequency ratio value is retrieved from memory based upon the assumption that the second frequency is the same, or close to the first frequency. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a second synthesized signal is generated having an output frequency equal to first frequency. Using a rotational frequency detector (RFD), the second communication signal, and the second synthesized signal, a second synthesized signal is generated having an output frequency equal to second frequency.

摘要翻译： 提供了一种用于在时钟和数据恢复（CDR）设备频率合成器中保持非同步通信信号的频率的系统和方法。 该方法最初获取具有第一频率的非同步第一通信信号的相位，并且将第一合成信号除以所选频率比值，产生频率等于参考信号频率的频率检测信号。 响应于丢失第一通信信号并随后接收具有非预定第二频率的第二通信信号，基于第二频率相同或接近第一频率的假设，从存储器检索频率比值。 使用相位频率检测器（PFD），参考信号和频率比值，产生具有等于第一频率的输出频率的第二合成信号。 使用旋转频率检测器（RFD），第二通信信号和第二合成信号，生成具有等于第二频率的输出频率的第二合成信号。

公开(公告)号：US08554815B1

公开(公告)日：2013-10-08

申请号：US12621361

申请日：2009-11-18

申请人： Viet Linh Do ,  Simon Pang

发明人： Viet Linh Do ,  Simon Pang

IPC分类号： G06F1/02 ,  G06F7/52

CPC分类号： E02F3/3609 ,  E02F3/3604 ,  E02F9/006

摘要： A system and method are provided for synthesizing signal frequencies using a single reference clock and a primitive ratio of integers. The method accepts a plurality (k) of reference frequency values (fri), where 1≦i≦k, associated with a corresponding plurality of synthesized frequency values (foi). For each synthesized frequency value, a raw ratio of integers Nprawi and Dprawi is calculated, such that: f o i = Np raw i Dp raw i × f r i . A greatest common divisor (GCD) of Nprawi and Dprawi and a primitive ratio of integers Np i Dp i is found for each raw ratio of integers, such that: N p i = Np raw i GCD ⁡ ( Np raw i , Dp raw i ) ; and , ⁢ D p i = Dp raw i GCD ⁡ ( Np raw i , Dp raw i ) . Using the common clock frequency value (fcr), each primitive ratio of integers, each reference frequency value, and each GCD, a final ratio of integers Ncri and Dcri, C · ( N cr i D cr i ) , is calculated for each synthesized frequency value, where C is an integer value.

摘要翻译： 提供了一种用于使用单个参考时钟和整数的原始比来合成信号频率的系统和方法。 该方法接受与对应的多个合成频率值（foi）相关联的多个（k）个参考频率值（fri），其中1 @ i @ k。 对于每个合成频率值，计算整数Nprawi和Dprawi的原始比，使得：f o i = Np raw i Dp raw i×f r i。 对于每个原始的整数比，发现Nprawi和Dprawi的最大公约数（GCD）和整数Np i Dp i的原始比率，使得：N pi = Np raw i GCD⁡（Np raw i，Dp raw i） ; 和D p i = Dp raw i GCD⁡（Np raw i，Dp raw i）。 使用公共时钟频率值（fcr），对于每个合成的时钟频率值（fcr），计算每个原始比例的整数，每个参考频率值和每个GCD，整数Ncri和Dcri，C·（N cr i D cr i）的最终比率 频率值，其中C是整数值。

公开(公告)号：US08059778B1

公开(公告)日：2011-11-15

申请号：US12755292

申请日：2010-04-06

申请人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

发明人： Viet Linh Do ,  Mehmet Mustafa Eker ,  Simon Pang

IPC分类号： H03D3/24

CPC分类号： H03L7/113 ,  H03L7/093 ,  H03L7/0995 ,  H03L7/1974 ,  H04L7/033 ,  H04L7/0331

摘要： A system and method are provided for automatically acquiring a serial data stream clock. The method receives a serial data stream with an unknown clock frequency and coarsely determines the clock frequency. The frequency is coarsely determined by (initially) selecting a high frequency first reference clock (Fref1), and counting the number of data transitions in a first time segment of the serial data stream at a plurality of sample frequencies equal to Fref1/n, where n is an integer ≧1. The count for each sampling frequency is compared to the count for Fref1 (n=1). Next, the highest sampling frequency (n=x) is determined, which has a lower count than Fref1, and the coarse clock frequency is set to Fc1=Fref1/(x−1).

摘要翻译： 提供了一种用于自动获取串行数据流时钟的系统和方法。 该方法接收到具有未知时钟频率的串行数据流，并粗略地确定时钟频率。 通过（最初）选择高频第一参考时钟（Fref1）粗略地确定频率，并且以等于Fref1 / n的多个采样频率对串行数据流的第一时间段中的数据转换次数进行计数，其中 n为整数≧1。 将每个采样频率的计数与Fref1（n = 1）的计数进行比较。 接下来，确定最高采样频率（n = x），其具有比Fref1更低的计数，并且将粗略时钟频率设置为Fc1 = Fref1 /（x-1）。