专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06495997B2 High impedance current mode voltage scalable driver 失效
公开(公告)号：US06495997B2
公开(公告)日：2002-12-17
申请号：US09895285
申请日：2001-06-29
申请人： Garrett W. Hall , Andrew M. Volk
发明人： Garrett W. Hall , Andrew M. Volk
IPC分类号： G05F316
CPC分类号： G05F3/242
摘要： A high impedance current mode voltage scalable driver allows signals from a higher supply voltage platform to transition to lower supply platforms. The scalable driver uses a current source to provide high impedance onto a load coupled to the driver. The driving of the load by the current source is controlled by symmetrical switches which are operated by the transition of the input signal. The driver utilizes voltage scaling to allow a particular higher supply voltage platform to transition to a variety of lower supply voltage platforms.

2. 发明授权

US08595274B2 Random number generator 有权
标题翻译：随机数发生器
公开(公告)号：US08595274B2
公开(公告)日：2013-11-26
申请号：US11967716
申请日：2007-12-31
申请人： Pravas Pradhan , Andrew M. Volk , Praveen Dani
发明人： Pravas Pradhan , Andrew M. Volk , Praveen Dani
IPC分类号： G06F1/02
CPC分类号： G06F7/588 , H04L9/0662 , H04L9/0861 , H04L2209/08 , H04L2209/12
摘要： Generally, this disclosure describes a system and method for generating random numbers. In at least one embodiment described herein, the method may include generating random bits in accordance with at least one security application via an integrated circuit, said integrated circuit including a true random number generator having an analog core. The method may further include providing, via an internally generated power supply, power to said analog core via a voltage regulator associated with said true random number generator. Of course, additional operations are also within the scope of the present disclosure.
摘要翻译：通常，本公开描述了用于生成随机数的系统和方法。在本文描述的至少一个实施例中，该方法可以包括经由集成电路根据至少一个安全应用产生随机比特，所述集成电路包括具有模拟核心的真随机数发生器。该方法还可以包括经由内部产生的电源经由与所述真随机数发生器相关联的电压调节器向所述模拟核心提供电力。当然，额外的操作也在本公开的范围内。

3. 发明申请

US20100073035A1 SYNCHRONOUS FREQUENCY SYNTHESIZER 有权
标题翻译：同步频率合成器
公开(公告)号：US20100073035A1
公开(公告)日：2010-03-25
申请号：US12238189
申请日：2008-09-25
申请人： Praveen Dani , Robert Fulton , Andrew M. Volk , Surya Musunuri
发明人： Praveen Dani , Robert Fulton , Andrew M. Volk , Surya Musunuri
IPC分类号： H03B21/00
CPC分类号： G06F1/08 , H03K5/1565 , H03K2005/00052 , H03L7/16
摘要： An apparatus for clock generation is presented. In one embodiment, the apparatus comprises a phase interpolator that generates an output with a phase value within reference phases associated with two input clocks. Logic units are coupled to determine a number of phase settings for the phase interpolator. A divider is coupled to the phase interpolator to generate an output clock based on a modifiable divider setting.
摘要翻译：提出了一种用于时钟生成的装置。在一个实施例中，该装置包括相位插值器，其产生具有与两个输入时钟相关联的参考相位内的相位值的输出。逻辑单元被耦合以确定相位内插器的多个相位设置。分频器耦合到相位内插器，以基于可修改的分频器设置产生输出时钟。

4. 发明授权

US07479777B2 Circuitry and method to measure a duty cycle of a clock signal 有权
标题翻译：测量时钟信号占空比的电路和方法
公开(公告)号：US07479777B2
公开(公告)日：2009-01-20
申请号：US11648488
申请日：2006-12-28
申请人： Mukul Kelkar , Andrew M. Volk , Rajesh Kanakath , Vui Y. Liew
发明人： Mukul Kelkar , Andrew M. Volk , Rajesh Kanakath , Vui Y. Liew
IPC分类号： G06M1/10 , H03L7/00 , H03L7/08 , G01R25/00
CPC分类号： G01R31/31727
摘要： In some embodiments, a chip includes clock generation circuitry to create a clock signal, and reference signal oscillator circuitry to produce a reference signal with a higher frequency than the clock signal. The chip includes a counter to change a count value in response to changes in the reference signal; and count logic circuitry to cause count storage circuitry to read the count value in response to at least some changes in the clock signal and to make at least some of the values in the count storage circuitry related to a duty cycle of the clock signal available to an external tester. Other embodiments are described and claimed.
摘要翻译：在一些实施例中，芯片包括用于产生时钟信号的时钟产生电路和参考信号振荡器电路，以产生具有比时钟信号更高的频率的参考信号。芯片包括响应于参考信号变化而改变计数值的计数器; 以及计数逻辑电路，以使得计数存储电路响应于所述时钟信号中的至少一些变化来读取所述计数值，并且使所述计数存储电路中的至少一些值与所述时钟信号的占空比相关，外部测试仪描述和要求保护其他实施例。

5. 发明授权

US06928494B1 Method and apparatus for timing-dependant transfers using FIFOs 失效
标题翻译：使用FIFO进行定时相关传输的方法和装置
公开(公告)号：US06928494B1
公开(公告)日：2005-08-09
申请号：US09538386
申请日：2000-03-29
申请人： Andrew M. Volk , Michael W. Williams , David J. McDonnell
发明人： Andrew M. Volk , Michael W. Williams , David J. McDonnell
IPC分类号： G11C7/10 , G06F3/00
CPC分类号： G11C7/10
摘要： A method and apparatus for communicating commands and/or data between two different time domains. In one embodiment, multiple memory commands are placed into one or more FIFOs in a manner that specifies the delays that must take place between execution of the different commands. Along with the commands, delay information is placed into the FIFOs, specifying the number of clock cycles, or other form of time delay, that must elapse between execution of a command and execution of a subsequent command. This delay information is used to delay the execution of the subsequent command for the specified time period, while minimizing or eliminating any excess delays. Cue information can also be placed into the FIFOs with the commands to specify which commands must wait for other commands before beginning execution. The delay and cue information is determined and created in the time domain that initiates the transfers. The delays and cueing are executed in the other time domain. Although the different commands may be delivered through different FIFOs and can therefore have unpredictable arrival times with respect to each other, the delay and cueing information maintains the proper execution order and timing between the commands. Interactive control logic at the output of each FIFO uses the timing data to maintain execution in the proper order and with the proper inter-command delays.
摘要翻译：一种用于在两个不同时域之间传送命令和/或数据的方法和装置。在一个实施例中，多个存储器命令以指定在不同命令的执行之间必须发生的延迟的方式被放置到一个或多个FIFO中。与命令一起，将延迟信息放入FIFO中，指定执行命令和执行后续命令之间必须经过的时钟周期数量或其他形式的时间延迟。该延迟信息用于在指定的时间段内延迟后续命令的执行，同时最小化或消除任何多余的延迟。提示信息也可以放在FIFO中，其命令用于指定哪些命令在开始执行之前必须等待其他命令。在启动传输的时域中确定和创建延迟和提示信息。延迟和提示在其他时间域执行。虽然不同的命令可以通过不同的FIFO传递，并且因此可以相对于彼此具有不可预测的到达时间，但延迟和提示信息保持命令之间的正确的执行顺序和定时。每个FIFO的输出端的交互控制逻辑使用定时数据来维持正确顺序的执行和适当的指令间延迟。

6. 发明授权

US06624662B1 Buffer with compensating drive strength 有权
标题翻译：具有补偿驱动强度的缓冲器
公开(公告)号：US06624662B1
公开(公告)日：2003-09-23
申请号：US09608503
申请日：2000-06-30
申请人： Andrew M. Volk
发明人： Andrew M. Volk
IPC分类号： H03K19094
CPC分类号： H03K19/0005 , H03K19/018585
摘要： A compensating buffer providing both course tuning on initialization and fine-tuning during operation is disclosed. The course tuning is provided by a plurality of binary-weighted driver legs which are selected during initialization. The fine-tuning which is selectable during both initialization and during operation is provided through linear-weighted biasing. The linear-weighted biasing is simplified through the use of a digital-to-analog converter.
摘要翻译：公开了一种在操作期间提供初始化和微调两个过程调整的补偿缓冲器。课程调整由在初始化期间选择的多个二进制加权的驾驶员腿提供。在初始化和运行期间均可选择的微调通过线性加权偏置来提供。通过使用数模转换器来简化线性加权偏置。

7. 发明授权

US06496132B2 Method and apparatus for increasing linearity and reducing noise coupling in a digital to analog converter 失效
公开(公告)号：US06496132B2
公开(公告)日：2002-12-17
申请号：US10068233
申请日：2002-02-05
申请人： Andrew M. Volk
发明人： Andrew M. Volk
IPC分类号： H03M100
CPC分类号： H03K17/063 , H03K17/04106 , H03M1/742
摘要： A DAC stage having a ground offset switch driver control signal generator, provides greater linearity by preventing rail-to-rail voltage swings of the switch driver signals. In one embodiment of the present invention, a pair of inverting logic gates, coupled between a power rail and a node positively offset from ground, are used to drive the current switches in a DAC stage.

8. 发明授权

US6166563A Method and apparatus for dual mode output buffer impedance compensation 有权
标题翻译：用于双模输出缓冲器阻抗补偿的方法和装置
公开(公告)号：US6166563A
公开(公告)日：2000-12-26
申请号：US299771
申请日：1999-04-26
申请人： Andrew M. Volk , Jennefer Asperheim , Hou-Sheng Lin , Romesh Trivedi
发明人： Andrew M. Volk , Jennefer Asperheim , Hou-Sheng Lin , Romesh Trivedi
IPC分类号： H03K19/00 , H03K19/0185 , H03K19/0175
CPC分类号： H03K19/018585 , H03K19/0005
摘要： A method and circuit for programming an output buffer having a first output driver for producing a first signaling level with a first programmable strength and a second output driver for producing a second signaling level with a second programmable strength. The method includes coupling a test resistor between a source of the second signaling level and a mode terminal, sensing a first level at the mode terminal, and uncoupling the test resistor from the mode terminal. If the first level is between the second signaling level and a reference level, then programming the output buffer with reference to an unterminated transmission line coupled to the mode terminal. Otherwise, programming the output buffer with reference to an external resistor coupled between a source of the first signaling level and the mode terminal. The circuit includes a first counter coupled to the first comparator to produce a first value responsive to the mode flag, the mode terminal, and the reference level. A first latch, coupled to the first counter, provides the adjusted first value to the first output driver. A second latch, coupled to the second counter, provides the adjusted second value to the second output driver.
摘要翻译：一种用于编程具有第一输出驱动器的输出缓冲器的方法和电路，所述第一输出驱动器用于产生具有第一可编程强度的第一信号电平和用于产生具有第二可编程强度的第二信号电平的第二输出驱动该方法包括将测试电阻器耦合在第二信号电平的源极和模式端子之间，感测模式端子处的第一电平，以及将测试电阻器与模式端子解耦。如果第一级在第二信令电平和参考电平之间，则参考耦合到模式终端的未终端传输线来编程输出缓冲器。否则，参考耦合在第一信号电平的源与模式终端之间的外部电阻来编程输出缓冲器。电路包括耦合到第一比较器的第一计数器，以响应于模式标志，模式端子和参考电平产生第一值。耦合到第一计数器的第一锁存器将经调整的第一值提供给第一输出驱动器。耦合到第二计数器的第二锁存器向第二输出驱动器提供经调整的第二值。

9. 发明授权

US5384502A Phase locked loop circuitry with split loop filter 失效
标题翻译：具有分离环路滤波器的锁相环电路
公开(公告)号：US5384502A
公开(公告)日：1995-01-24
申请号：US82282
申请日：1993-06-24
申请人： Andrew M. Volk
发明人： Andrew M. Volk
IPC分类号： H03L7/089 , H03B1/00 , G05F5/00 , H03K3/26 , H03K5/13
CPC分类号： H03L7/0893
摘要： A filter circuit of a phase locked loop circuitry fabricated on a single substrate provides an error voltage proportional to an amount of a phase difference of a comparison of a reference signal and a feedback signal. The filter circuit is coupled to a phase comparator of the phase looked loop circuitry for receiving the comparison of the reference and feedback signals. The filter circuit includes a first capacitor having a first end coupled to an output of the phase comparator and a second end coupled to ground for generating a first error voltage with respect to the amount of the phase difference of the comparison of the reference and feedback signals. The filter circuit also includes a resistor and capacitor circuit that has a first end coupled to the output of the phase comparator and a second end coupled to the ground for generating a second error voltage with respect to the amount of the phase difference of the comparison of the reference and feedback signals. The resistor and capacitor circuit includes a second capacitor and a resistor coupled between the first and second ends of the resistor and capacitor circuit. The capacitances of the first and second capacitors are independent of each other and can be accurately set. An add circuitry is coupled to receive the first error voltage at the first end of the first capacitor and the second error voltage at the first end of the resistor and capacitor circuit for adding the first and second error voltages to generate the error voltage such that the phase locked loop circuitry can operate in a low power supply environment.
摘要翻译：制造在单个衬底上的锁相环电路的滤波器电路提供与参考信号和反馈信号的比较的相位差成比例的误差电压。滤波器电路耦合到相位环路电路的相位比较器，用于接收参考和反馈信号的比较。滤波器电路包括第一电容器，其具有耦合到相位比较器的输出的第一端和耦合到地的第二端，用于相对于参考和反馈信号的比较的相位差的量产生第一误差电压。滤波器电路还包括电阻器和电容器电路，其具有耦合到相位比较器的输出的第一端和耦合到地的第二端，用于相对于比较的相位差的量产生第二误差电压参考和反馈信号。电阻器和电容器电路包括耦合在电阻器和电容器电路的第一和第二端之间的第二电容器和电阻器。第一和第二电容器的电容彼此独立并且可以被精确地设定。加法电路被耦合以在第一电容器的第一端处接收第一误差电压，并且在电阻器和电容器电路的第一端处接收第二误差电压，用于增加第一和第二误差电压以产生误差电压，使得锁相环电路可以在低电源环境中工作。

10. 发明授权

US07466174B2 Fast lock scheme for phase locked loops and delay locked loops 有权
标题翻译：用于锁相环和延迟锁定环的快速锁定方案
公开(公告)号：US07466174B2
公开(公告)日：2008-12-16
申请号：US11396041
申请日：2006-03-31
申请人： Sridhar R. Tirumalai , Amir Bashir , Jing Li , Andrew M. Volk
发明人： Sridhar R. Tirumalai , Amir Bashir , Jing Li , Andrew M. Volk
IPC分类号： H03L7/06
CPC分类号： H03L7/107 , H03L7/0893
摘要： A fast lock scheme for phase locked loops and delay locked loops, where apparatus, systems, and methods include a startup circuit that is enabled at the beginning of a startup mode and is disabled upon a phase transition detection in the reference and feedback signals to the phase locked loop or delay locked loop. Further apparatus, systems, and methods enable a first charge pump when a phase transition is detected, and enable a second charge pump when the phase difference between the reference and feedback signals fall within a predetermined range.
摘要翻译：用于锁相环和延迟锁定环的快速锁定方案，其中装置，系统和方法包括在启动模式开始时使能的启动电路，并且在参考中的相变检测被禁用，并且将反馈信号反馈到锁相环或延迟锁定环。当检测到相变时，另外的装置，系统和方法使第一电荷泵能够在参考和反馈信号之间的相位差落在预定范围内时启用第二电荷泵。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式