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1. 发明申请

US20090028218A1 USB system with spread spectrum EMI reduction 有权
标题翻译： USB系统具有扩频EMI降低功能
公开(公告)号：US20090028218A1
公开(公告)日：2009-01-29
申请号：US11881416
申请日：2007-07-27
申请人： Dan Hariton , Narendar Venugopal , Duoc Nguyen , Santosh K. Panigrahi , Gautam K. Singh , Sushl Kumar
发明人： Dan Hariton , Narendar Venugopal , Duoc Nguyen , Santosh K. Panigrahi , Gautam K. Singh , Sushl Kumar
IPC分类号： H04B1/69
CPC分类号： H04L1/205 , H04L2001/0094
摘要： A method for applying spread spectrum noise reduction techniques to USB specifically USB2.0 communications systems includes the step of generating a base (seed) frequency for the USB system, modulating the base (seed) frequency with a spread spectrum (SS) characteristic, and utilizing (as-is, not modified) the existing ASIC that multiplying the now modulated base (seed) frequency to generate the USB standard frequency signaling rate of 480 MHz with the SS characteristic within the USB standard specification for frequency deviation.
摘要翻译：一种将扩展频谱降噪技术应用于USB专用USB2.0通信系统的方法包括为USB系统生成基本（种子）频率，以扩展频谱（SS）特性调制基本（种子）频率的步骤，以及利用（原样，未修改）现有的ASIC，将现有调制的基准（种子）频率乘以产生USB标准频率信号速率为480 MHz，具有USB标准规范内的SS特性，用于频率偏差。

2. 发明授权

US07953175B2 USB system with spread spectrum EMI reduction 有权
标题翻译： USB系统具有扩频EMI降低功能
公开(公告)号：US07953175B2
公开(公告)日：2011-05-31
申请号：US11881416
申请日：2007-07-27
申请人： Dan Hariton , Narendar Venugopal , Duoc Nguyen , Santosh K. Panigrahi , Gautam K. Singh , Sushl Kumar
发明人： Dan Hariton , Narendar Venugopal , Duoc Nguyen , Santosh K. Panigrahi , Gautam K. Singh , Sushl Kumar
IPC分类号： H04L27/00
CPC分类号： H04L1/205 , H04L2001/0094
摘要： A method for applying spread spectrum noise reduction techniques to USB specifically USB2.0 communications systems includes the step of generating a base (seed) frequency for the USB system, modulating the base (seed) frequency with a spread spectrum (SS) characteristic, and utilizing (as-is, not modified) the existing ASIC that multiplying the now modulated base (seed) frequency to generate the USB standard frequency signaling rate of 480 MHz with the SS characteristic within the USB standard specification for frequency deviation.
摘要翻译：一种将扩展频谱降噪技术应用于USB专用USB2.0通信系统的方法包括为USB系统生成基本（种子）频率，以扩展频谱（SS）特性调制基本（种子）频率的步骤，以及利用（原样，未修改）现有的ASIC，将现有调制的基准（种子）频率乘以产生USB标准频率信号速率为480 MHz，具有USB标准规范内的SS特性，用于频率偏差。

3. 发明申请

US20080157894A1 Method and apparatus for frequency modulating a periodic signal of varying duty cycle 有权
标题翻译：用于频率调制变化占空比的周期信号的方法和装置
公开(公告)号：US20080157894A1
公开(公告)日：2008-07-03
申请号：US12074459
申请日：2008-03-03
申请人： Dan Ion Hariton , Narendar Venugopal
发明人： Dan Ion Hariton , Narendar Venugopal
IPC分类号： H03K7/08
CPC分类号： H03K7/10 , H03K7/08 , H04B15/02 , H04B2215/067
摘要： A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal to generate a spread spectrum carrier signal; and, 3) retiming a PWM signal with this high frequency SS carrier signal so that the binary transitions of the PWM signal are aligned with the frequency varying carrier signal. In another embodiment, a PWM oscillator is driven by a second, FM oscillator having spread spectrum characteristics. In another embodiment a PWM oscillator is driven and modulated by a counter/frequency divider comprised of modules.
摘要翻译：用于对PWM进行频率调制的方法和装置包括：1）产生频率比PWM信号大得多的高频载波信号; 2）调制高频信号以产生扩频载波信号; 并且3）用该高频SS载波信号重新定时PWM信号，使得PWM信号的二进制转换与频率变化载波信号对准。在另一个实施例中，PWM振荡器由具有扩展频谱特性的第二FM振荡器驱动。在另一个实施例中，PWM振荡器由包括模块的计数器/分频器驱动和调制。

4. 发明授权

US07676012B1 Spread spectrum controllable delay clock buffer with zero cycle slip 有权
标题翻译：扩展频谱可控延迟时钟缓冲器，零周期滑移
公开(公告)号：US07676012B1
公开(公告)日：2010-03-09
申请号：US10831017
申请日：2004-04-22
申请人： Narendar Venugopal , Dan I. Hariton , Dipankar Mandal , Sushil Kumar , Werner Hoeft
发明人： Narendar Venugopal , Dan I. Hariton , Dipankar Mandal , Sushil Kumar , Werner Hoeft
IPC分类号： H03D3/24
CPC分类号： H03B23/00
摘要： A controllable delay clock buffer that provides spread spectrum modulation of the output signals with zero cycle slip includes a PLL having a PLL loop filter that comprises an RC network. A clock signal is input to the PLL, and a SS modulation frequency is injected into the capacitor of the PLL loop filter. The SS signal is provided by a secondary charge pump that produces a programmable waveform such as a square wave or a stair case square wave current signal. The programmable waveform is integrated by the loop filter capacitor to form a corresponding triangular or trigonal waveform which varies the input to the VCO of the PLL to define a frequency modulation profile that has a corresponding triangular or trigonal envelope. The bandpass profile of the SS modulation signal is at a higher frequency range than the lowpass profile of the PLL, so that the SS waveform profile is not distorted or cancelled by the PLL.
摘要翻译：提供具有零周期滑差的输出信号的扩频调制的可控延迟时钟缓冲器包括具有包括RC网络的PLL环路滤波器的PLL。时钟信号被输入到PLL，SS调制频率被注入到PLL环路滤波器的电容器中。 SS信号由产生诸如方波或阶梯方波电流信号的可编程波形的次级电荷泵提供。可编程波形由环路滤波电容器集成，形成对应的三角波或三角波形，其改变PLL的VCO的输入以定义具有相应三角形或三角形包络的频率调制曲线。 SS调制信号的带通分布在比PLL的低通分布更高的频率范围内，使得SS波形分布不被PLL失真或消除。

5. 发明授权

US5491458A Apparatus for spreading the spectrum of a signal and method therefor 失效
标题翻译：用于扩展信号频谱的装置及其方法
公开(公告)号：US5491458A
公开(公告)日：1996-02-13
申请号：US336006
申请日：1994-11-08
申请人： Earl W. McCune, Jr. , Narendar Venugopal
发明人： Earl W. McCune, Jr. , Narendar Venugopal
IPC分类号： H03B1/04 , H03C3/00 , H03B29/00 , H03K3/84
CPC分类号： H04B15/04 , H03B1/04 , H03B2202/08 , H03C3/00
摘要： An oscillator generates a signal that is applied to one input of a phase shifter circuit. The other input of the phase shifter is connected to a source of a phase modulation signal. In response to the phase modulationsignal, the phase shifter provides a clock signal with a spread spectrum.
摘要翻译：振荡器产生施加到移相器电路的一个输入端的信号。移相器的另一输入端连接到相位调制信号的源极。响应于相位调制信号，移相器提供具有扩展频谱的时钟信号。

6. 发明授权

US08254430B1 Method and apparatus for detection and control of spread spectrum EMI reduction 有权
标题翻译：用于检测和控制扩频EMI降低的方法和装置
公开(公告)号：US08254430B1
公开(公告)日：2012-08-28
申请号：US09950225
申请日：2001-09-10
申请人： Narendar Venugopal
发明人： Narendar Venugopal
IPC分类号： H04B1/00
CPC分类号： H03L7/06 , G09G2330/06
摘要： A method and apparatus for enabling the operative association of electronic devices that each employ spread spectrum EMI noise reduction. The method includes the detection of frequency modulation and the generation of a modulation detection signal that conveys the modulation extent and type. The modulation detection signal is then used to accommodate the modulation technique and make it compatible with the receiving electronic device. The apparatus of the invention includes an FM modulator that creates an FM signal from an input signal, an FM detector that detects the FM content of the incoming signal and represent this information by means of either voltage or current signals, and a circuit to process this FM information and perform functions such as modification of the FM content and generating a new signal with this new content, complete removal of the content, and “no-action,” whereby the signal is passed on with no alteration to the content.
摘要翻译：一种能够实现每个采用扩频EMI噪声降低的电子设备的可操作关联的方法和装置。该方法包括频率调制的检测和传送调制范围和类型的调制检测信号的产生。然后调制检测信号用于适应调制技术并使其与接收电子设备兼容。本发明的装置包括一个从输入信号产生FM信号的FM调制器，一个检测输入信号的FM内容并通过电压或电流信号表示该信息的FM检测器，以及一个处理该信号的电路 FM信息，并且执行诸如修改FM内容以及利用该新内容生成新信号，完全移除内容以及“无动作”等功能，由此传递信号而不改变内容。

7. 发明授权

US07679464B2 Method and apparatus for frequency modulating a periodic signal of varying duty cycle 有权
标题翻译：用于频率调制变化占空比的周期信号的方法和装置
公开(公告)号：US07679464B2
公开(公告)日：2010-03-16
申请号：US12074459
申请日：2008-03-03
申请人： Dan Ion Hariton , Narendar Venugopal
发明人： Dan Ion Hariton , Narendar Venugopal
IPC分类号： H03K3/02 , H03K7/08
CPC分类号： H03K7/10 , H03K7/08 , H04B15/02 , H04B2215/067
摘要： A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal to generate a spread spectrum carrier signal; and, 3) retiming a PWM signal with this high frequency SS carrier signal so that the binary transitions of the PWM signal are aligned with the frequency varying carrier signal. In another embodiment, a PWM oscillator is driven by a second, FM oscillator having spread spectrum characteristics. In another embodiment a PWM oscillator is driven and modulated by a counter/frequency divider comprised of modules.
摘要翻译：用于对PWM进行频率调制的方法和装置包括：1）产生频率比PWM信号大得多的高频载波信号; 2）调制高频信号以产生扩频载波信号; 并且3）用该高频SS载波信号重新定时PWM信号，使得PWM信号的二进制转换与频率变化载波信号对准。在另一个实施例中，PWM振荡器由具有扩展频谱特性的第二FM振荡器驱动。在另一个实施例中，PWM振荡器由包括模块的计数器/分频器驱动和调制。

8. 发明授权

US07561002B1 Method and apparatus for frequency modulating a periodic signal of varying duty cycle 有权
标题翻译：用于频率调制变化占空比的周期信号的方法和装置
公开(公告)号：US07561002B1
公开(公告)日：2009-07-14
申请号：US11115550
申请日：2005-04-26
申请人： Dan Ion Hariton , Narendar Venugopal
发明人： Dan Ion Hariton , Narendar Venugopal
IPC分类号： H03K7/08 , H03C3/06
CPC分类号： H03K7/10 , H03K7/08 , H04B15/02 , H04B2215/067
摘要： A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal to generate a spread spectrum carrier signal; and, 3) retiming a PWM signal with this high frequency SS carrier signal so that the binary transitions of the PWM signal are aligned with the frequency varying carrier signal. In another embodiment, a PWM oscillator is driven by a second, FM oscillator having spread spectrum characteristics. In another embodiment a PWM oscillator is driven and modulated by a counter/frequency divider comprised of modules.
摘要翻译：用于对PWM进行频率调制的方法和装置包括：1）产生频率比PWM信号大得多的高频载波信号; 2）调制高频信号以产生扩频载波信号; 并且3）用该高频SS载波信号重新定时PWM信号，使得PWM信号的二进制转换与频率变化载波信号对准。在另一个实施例中，PWM振荡器由具有扩展频谱特性的第二FM振荡器驱动。在另一个实施例中，PWM振荡器由包括模块的计数器/分频器驱动和调制。

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