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11. 发明授权

US06617905B1 System and method for threshold bias offset voltage cancellation in a comparator 有权
标题翻译：比较器中阈值偏移电压消除的系统和方法
公开(公告)号：US06617905B1
公开(公告)日：2003-09-09
申请号：US10282547
申请日：2002-10-29
申请人： Hongming An , Brian Lee Abernethy , Bruce Harrison Coy
发明人： Hongming An , Brian Lee Abernethy , Bruce Harrison Coy
IPC分类号： H03L500
CPC分类号： H03F3/45982 , H03F3/45609 , H03K5/2418
摘要： A system and method are provided for reducing the threshold bias offset voltage in a comparator, by canceling and bypassing the bias offset current errors. The comparator system comprises amplification stages with bias cancellation circuitry and a threshold setting circuit. The bias offset current cancellation circuit is used to cancel the base current of differential amplifier input emitter follower. The bias offset current cancellation circuit also cancels the loading effect of amplifier input emitter-follower driving stage. The threshold offset voltage is further reduced by the threshold setting circuit. The threshold-setting circuit includes two integrators and a unit gain operation amplifier. The integrators have the input accept a single-ended input signal, an output connected to the negative input of the comparator, and an output connected to the unit gain operational amplifier, whose output is connected to the negative input of the comparator.
摘要翻译：提供了一种系统和方法，用于通过消除和绕过偏置偏移电流误差来减小比较器中的阈值偏移偏移电压。比较器系统包括具有偏置消除电路和阈值设置电路的放大级。偏置电流消除电路用于消除差分放大器输入射极跟随器的基极电流。偏置电流消除电路还消除了放大器输入发射极跟随器驱动级的负载效应。阈值设置电路进一步减小阈值偏移电压。阈值设置电路包括两个积分器和单位增益运算放大器。积分器具有接收单端输入信号，连接到比较器的负输入的输出和连接到单位增益运算放大器的输出，其输出连接到比较器的负输入。

12. 发明授权

US08432981B1 High frequency and idle communication signal state detection 有权
标题翻译：高频和空闲通信信号状态检测
公开(公告)号：US08432981B1
公开(公告)日：2013-04-30
申请号：US12721333
申请日：2010-03-10
申请人： Hongming An , Wei Fu , CongQing Xiong , James Ho
发明人： Hongming An , Wei Fu , CongQing Xiong , James Ho
IPC分类号： H04K1/10 , H04M1/64 , H04M1/00
CPC分类号： H04K3/22 , H04K3/45 , H04K3/822
摘要： Various techniques are provided to detect a state of a communication signal. In one example, a method of detecting a state of a signal includes receiving a differential communication signal comprising a positive portion and a complementary negative portion. The method also includes generating a common mode voltage signal from the positive portion and the negative portion of the communication signal. The method also includes rectifying the positive portion and the negative portion of the communication signal to provide a rectified signal. The method also includes comparing the common mode voltage, signal with the rectified signal. The method also includes generating a high frequency detect signal in response to the comparing. The method also includes determining whether the communication signal is in an idle state or a high frequency state based on the high frequency detect signal.
摘要翻译：提供各种技术来检测通信信号的状态。在一个示例中，检测信号状态的方法包括接收包括正部分和互补负部分的差分通信信号。该方法还包括从通信信号的正部分和负部分产生共模电压信号。该方法还包括校正通信信号的正部分和负部分以提供整流信号。该方法还包括将共模电压，信号与整流信号进行比较。该方法还包括响应于比较产生高频检测信号。该方法还包括基于高频检测信号确定通信信号是处于空闲状态还是高频状态。

13. 发明授权

US06775635B1 System and method for measuring amplifier gain in a digital network 失效
标题翻译：用于测量数字网络中放大器增益的系统和方法
公开(公告)号：US06775635B1
公开(公告)日：2004-08-10
申请号：US10217209
申请日：2002-08-12
申请人： Bruce Harrison Coy , Hongming An , Shyang Kye Kong
发明人： Bruce Harrison Coy , Hongming An , Shyang Kye Kong
IPC分类号： G01R3500
CPC分类号： G01R31/319 , G01R31/3171 , H04B17/20
摘要： A system and method are provided for measuring amplifier gain in a digital network. The method includes accepting a digital input signal; amplifying the input signal (Vin); comparing the amplified signal to dc thresholds; measuring output errors; and, calculating the amplifier gain in response to the thresholds. More specifically, accepting a digital input signal includes accepting an input signal having an amplitude. Comparing the amplified signal to dc thresholds includes comparing the amplified signal to a low threshold and a high threshold. Measuring errors includes measuring a predetermined error condition in response to the high threshold and the low threshold. Then, calculating the amplifier gain in response to the thresholds includes calculating the amplifier gain in response to the high threshold, the low threshold, and the input signal amplitude.
摘要翻译：提供了一种用于测量数字网络中的放大器增益的系统和方法。该方法包括接收数字输入信号; 放大输入信号（Vin）; 将放大的信号与直流阈值进行比较; 测量输出误差; 并且响应于阈值来计算放大器增益。更具体地，接受数字输入信号包括接受具有振幅的输入信号。将放大的信号与直流阈值进行比较包括将放大的信号与低阈值和高阈值进行比较。测量误差包括响应于高阈值和低阈值来测量预定的误差条件。然后，响应于阈值来计算放大器增益包括响应于高阈值，低阈值和输入信号幅度来计算放大器增益。

14. 发明授权

US06696897B1 System and method for voltage controlled oscillator phase interpolation 有权
标题翻译：压控振荡器相位插值的系统和方法
公开(公告)号：US06696897B1
公开(公告)日：2004-02-24
申请号：US10218946
申请日：2002-08-14
申请人： Shyang Kye Kong , Hongming An , Bruce Harrison Coy
发明人： Shyang Kye Kong , Hongming An , Bruce Harrison Coy
IPC分类号： H03B2700
CPC分类号： H03K5/135 , H03B27/00 , H03K17/603 , H03K17/6264 , H03K2005/00065
摘要： A system and method are provided for controlling the phase of a voltage controlled oscillator output. The method comprises: accepting a plurality of VCO outputs coarsely differentiated by phase; selecting one of the VCO outputs; finely modifying the phase of the selected VCO output; and, supplying the phase modified VCO output. In one aspect, accepting VCO outputs coarsely differentiated by phase includes: accepting a first VCO output (I0); accepting a second VCO output (I1), differentiated approximately 90 degrees from the first VCO output; accepting a third VCO output (Q0), differentiated approximately 90 degrees from the second VCO output; and, accepting a fourth VCO output (Q1), differentiated approximately 90 degrees from the third VCO output. Finely modifying the phase of the selected VCO output includes modifying the selected VCO output in the range between +45 and −45 degrees. In one aspect, the output is modified in 16 discrete steps.
摘要翻译：提供一种用于控制压控振荡器输出的相位的系统和方法。该方法包括：接受由相位粗略区分的多个VCO输出; 选择一个VCO输出; 精细修改所选VCO输出的相位; 并提供相位改变的VCO输出。在一个方面，接受由相位粗略微分的VCO输出包括：接受第一VCO输出（I0）; 接受与第一VCO输出差分大约90度的第二VCO输出（I1）; 接受与第二VCO输出差分大约90度的第三个VCO输出（Q0）; 并且接受与第三VCO输出差分大约90度的第四VCO输出（Q1）。精细修改所选VCO输出的相位包括在+45和-45度之间的范围内修改选定的VCO输出。在一个方面，输出在16个离散步骤中被修改。

15. 发明授权

US08971423B1 Systems and methods for locking an oscillator to an incoming data signal 有权
标题翻译：将振荡器锁定到输入数据信号的系统和方法
公开(公告)号：US08971423B1
公开(公告)日：2015-03-03
申请号：US12721432
申请日：2010-03-10
申请人： Wei Fu , Hongming An , Bin Nie , Jun Ye
发明人： Wei Fu , Hongming An , Bin Nie , Jun Ye
IPC分类号： H04K1/10 , H03D3/24 , H03K5/19
CPC分类号： H03L7/0807 , H03L7/0895 , H03L7/093 , H03L7/113
摘要： In one example, a system includes an oscillator adapted to provide an oscillator signal, a frequency divider adapted to divide the oscillator signal to provide a divided oscillator signal, and a phase-frequency detector adapted to provide phase-frequency detection signals in response to a reference clock signal and the divided oscillator signal. The system also includes a charge pump adapted to provide first output signals in response to the phase-frequency detection signals, a phase detector adapted provide second output signals in response to an incoming data signal and the oscillator signal, and one or more switches adapted to pass the first output signals during a frequency acquisition mode and pass the second output signals during a phase lock mode. The system also includes an active filter adapted to filter the passed first or second output signals. The oscillator is adapted to adjust a frequency of the oscillator signal in response to the filtered first or second output signals.
摘要翻译：在一个示例中，系统包括适于提供振荡器信号的振荡器，适于分频振荡器信号以提供分频振荡器信号的分频器，以及相位频率检测器，其适于响应于参考时钟信号和分频振荡器信号。该系统还包括适于响应于相位频率检测信号提供第一输出信号的电荷泵，相位检测器适于响应输入数据信号和振荡器信号提供第二输出信号，以及一个或多个开关，适于在频率获取模式期间传递第一输出信号，并在锁相模式期间传递第二输出信号。该系统还包括适用于过滤所传送的第一或第二输出信号的有源滤波器。振荡器适于响应于滤波的第一或第二输出信号来调整振荡器信号的频率。

16. 发明授权

US08775856B1 System and method for generating clock signal for a plurality of communication ports by selectively dividing a reference clock signal with a plurality of ratios 有权
标题翻译：通过选择性地划分具有多个比率的参考时钟信号来产生多个通信端口的时钟信号的系统和方法
公开(公告)号：US08775856B1
公开(公告)日：2014-07-08
申请号：US12721447
申请日：2010-03-10
申请人： Hongming An , Jun Ye , Christopher Thomas , CongQing Xiong
发明人： Hongming An , Jun Ye , Christopher Thomas , CongQing Xiong
IPC分类号： G06F1/00 , G06F1/12
CPC分类号： G06F1/06
摘要： Various techniques are provided to generate a plurality of reference clock signals using a single reference clock signal generator. In one example, a clock signal generation system includes a reference clock signal generator adapted to provide a reference clock signal. The system also includes a plurality of dividers adapted to divide the reference clock signal using different ratios to provide a plurality of communication port clock signals. The system also includes a plurality of different communication ports adapted to receive the communication port clock signals and adapted to operate in accordance with different communication protocols using the communication port clock signals.
摘要翻译：提供各种技术以使用单个参考时钟信号发生器产生多个参考时钟信号。在一个示例中，时钟信号产生系统包括适于提供参考时钟信号的参考时钟信号发生器。该系统还包括多个分频器，其适于使用不同的比率划分参考时钟信号以提供多个通信端口时钟信号。该系统还包括多个不同的通信端口，其适于接收通信端口时钟信号并且适于根据使用通信端口时钟信号的不同通信协议进行操作。

17. 发明授权

US08111785B2 Auto frequency acquisition maintenance in a clock and data recovery device 有权
标题翻译：自动频率采集维护在时钟和数据恢复设备中
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。

18. 发明申请

US20090201066A1 Digitally Clock with Selectable Frequency and Duty Cycle 有权
标题翻译：数字时钟，可选频率和占空比
公开(公告)号：US20090201066A1
公开(公告)日：2009-08-13
申请号：US12423774
申请日：2009-04-14
申请人： Viet Linh Do , Hongming An , Jim Lew
发明人： Viet Linh Do , Hongming An , Jim Lew
IPC分类号： G06F1/04
CPC分类号： G06F1/08
摘要： A system and method are provided for controlling the duty cycle and frequency of a digitally generated clock. The method accepts a first clock signal having a fixed first frequency. A frequency control word with a first pattern is loaded into a first plurality of serially-connected registers. A duty cycle control word with a second pattern is loaded into a second plurality of serially-connected registers. A register clock signal is generated in response to the first clock and the first pattern. Then, a digital clock signal is generated having a frequency and duty cycle responsive to the register clock signal and the second pattern.
摘要翻译：提供了一种用于控制数字生成时钟的占空比和频率的系统和方法。该方法接收具有固定的第一频率的第一时钟信号。具有第一模式的频率控制字被加载到第一多个串行连接的寄存器中。具有第二模式的占空比控制字被加载到第二多个串行连接的寄存器中。响应于第一时钟和第一模式产生寄存器时钟信号。然后，产生响应于寄存器时钟信号和第二模式的频率和占空比的数字时钟信号。

19. 发明授权

US06744286B1 System and method for comparator threshold adjustment 有权
标题翻译：用于比较器阈值调整的系统和方法
公开(公告)号：US06744286B1
公开(公告)日：2004-06-01
申请号：US10217215
申请日：2002-08-12
申请人： Hongming An , Bruce Harrison Coy , Shyang Kye Kong , Brian Lee Abernathy , Paul Edward Vanderbilt
发明人： Hongming An , Bruce Harrison Coy , Shyang Kye Kong , Brian Lee Abernathy , Paul Edward Vanderbilt
IPC分类号： H03K5153
CPC分类号： H03K5/082
摘要： A system and method are provided for compensating a comparator threshold level. The method comprises: accepting an input signal with an ac component; lowpass filtering the input signal to generate the input signal average voltage; accepting the input signal average voltage; accepting a first dc level; summing the average voltage with the first dc level; supplying a first sum as a first comparator threshold level; comparing the input signal to the first comparator threshold level; and, supplying a first comparator output signal with an ac component. In some aspects of the method, accepting a first dc level includes accepting a plurality of dc levels. Then, the average voltage is summed with each of the plurality of dc levels and supplied as a corresponding plurality of comparator threshold levels. The input signal is compared to each of the comparator threshold levels and a plurality of comparator output signals are supplied.
摘要翻译：提供了用于补偿比较器阈值电平的系统和方法。该方法包括：接收具有交流分量的输入信号; 低通滤波输入信号以产生输入信号平均电压; 接受输入信号平均电压; 接受第一直流电平; 将平均电压与第一直流电平相加; 提供第一和作为第一比较器阈值电平; 将输入信号与第一比较器阈值电平进行比较; 并且提供具有交流分量的第一比较器输出信号。在该方法的一些方面，接受第一直流电平包括接受多个直流电平。然后，将平均电压与多个dc电平中的每一个相加并作为对应的多个比较器阈值电平提供。将输入信号与每个比较器阈值电平进行比较，并提供多个比较器输出信号。

20. 发明授权

US08391420B1 Low frequency communication signal state detection 有权
标题翻译：低频通信信号状态检测
公开(公告)号：US08391420B1
公开(公告)日：2013-03-05
申请号：US12721365
申请日：2010-03-10
申请人： Hongming An , Wei Fu , CongQing Xiong , James Ho
发明人： Hongming An , Wei Fu , CongQing Xiong , James Ho
IPC分类号： H04L27/00 , H04L27/10 , H02P11/00
CPC分类号： H04L25/0272 , H04L25/0292
摘要： Various techniques are provided to detect a state of a communication signal. In one example, a method of detecting a state of a signal includes receiving a differential communication signal comprising a positive portion and a complementary negative portion. The method also includes filtering the positive portion of the communication signal through a first low pass filter to provide a filtered positive portion of the communication signal. The method also includes filtering the negative portion of the communication signal through a second low pass filter to provide a filtered negative portion of the communication signal. The method also includes comparing the filtered positive portion of the communication signal with an internal reference voltage. The method also includes comparing the filtered negative portion of the communication signal with the internal reference voltage. The method also includes generating a low frequency detect signal in response to the comparing operations to indicate whether the communication signal is in a low frequency state.
摘要翻译：提供各种技术来检测通信信号的状态。在一个示例中，检测信号状态的方法包括接收包括正部分和互补负部分的差分通信信号。该方法还包括通过第一低通滤波器对通信信号的正部分进行滤波，以提供经过滤波的通信信号的正部分。该方法还包括通过第二低通滤波器对通信信号的负部分进行滤波，以提供经过滤波的通信信号的负部分。该方法还包括将通信信号的经滤波的正部分与内参考电压进行比较。该方法还包括将通信信号的滤波后的负部分与内部基准电压进行比较。该方法还包括响应于比较操作产生低频检测信号，以指示通信信号是否处于低频状态。

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