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公开(公告)号：US07626721B2
公开(公告)日：2009-12-01
申请号：US11546791
申请日：2006-10-12
CPC分类号： H03H17/0621 , H03H17/0219
摘要： A system and method are provided for minimizing data-dependent power variations. The system and method can include summing an input with a dither signal, processing the summed signal, and substantially removing the effects of the dither signal from the output. The output is an approximation of processing to the input alone, while certain aspects of processing activity, such as temperature changes and current draw, are less dependent on input values. Variations in data-dependent activities are thus reduced. The effects of the dither signal may be removed by equivalently processing the dither signal alone, and using that result as a compensating signal to cancel components of the processed signal that result from the presence of the dither signal.
摘要翻译： 提供了一种用于最小化依赖于数据的功率变化的系统和方法。 该系统和方法可以包括将输入与抖动信号相加，处理相加的信号，以及基本上去除抖动信号对输出的影响。 输出是对输入单独处理的近似值，而处理活动的某些方面（如温度变化和电流消耗）较少依赖于输入值。 因此，数据依赖活动的变化减少了。 可以通过等效地处理抖动信号来消除抖动信号的影响，并且使用该结果作为补偿信号来消除由抖动信号的存在引起的处理信号的分量。
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公开(公告)号：US20080143565A1
公开(公告)日：2008-06-19
申请号：US11546791
申请日：2006-10-12
IPC分类号： H03M1/20
CPC分类号： H03H17/0621 , H03H17/0219
摘要： A system and method are provided for minimizing data-dependent power variations. The system and method can include summing an input with a dither signal, processing the summed signal, and substantially removing the effects of the dither signal from the output. The output is an approximation of processing to the input alone, while certain aspects of processing activity, such as temperature changes and current draw, are less dependent on input values. Variations in data-dependent activities are thus reduced. The effects of the dither signal may be removed by equivalently processing the dither signal alone, and using that result as a compensating signal to cancel components of the processed signal that result from the presence of the dither signal.
摘要翻译： 提供了一种用于最小化依赖于数据的功率变化的系统和方法。 该系统和方法可以包括将输入与抖动信号相加，处理相加的信号，以及基本上去除抖动信号对输出的影响。 输出是对输入单独处理的近似值，而处理活动的某些方面（如温度变化和电流消耗）较少依赖于输入值。 因此，数据依赖活动的变化减少了。 可以通过等效地处理抖动信号来消除抖动信号的影响，并且使用该结果作为补偿信号来消除由抖动信号的存在引起的处理信号的分量。
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公开(公告)号：US07450044B2
公开(公告)日：2008-11-11
申请号：US11692128
申请日：2007-03-27
申请人： George S. Moore , Nico Lugil , Kenneth D. Poulton
发明人： George S. Moore , Nico Lugil , Kenneth D. Poulton
IPC分类号： H03M1/06
CPC分类号： H03M1/0609 , H03M1/0624 , H03M1/1028 , H03M1/1042 , H03M1/662
摘要： A digital-to-analog conversion system comprises a digital input, a digital-to-analog converter and a modified digital signal generator. The digital-to-analog converter has a conversion frequency and is subject to a periodic error having a periodicity equal to that of an N-th sub-harmonic of the conversion frequency, where N is an integer. The digital input is operable to receive a digital input signal. The modified digital signal generator is interposed between the digital input and the digital-to-analog converter and is operable in response to the digital input signal to generate a modified digital signal. The modified digital signal comprises a dynamic digital mitigation component that mitigates the periodic error of the digital-to-analog converter.
摘要翻译： 数模转换系统包括数字输入，数模转换器和经修改的数字信号发生器。 数模转换器具有转换频率，并且经受周期性误差，其周期性等于转换频率的第N次谐波的周期性，其中N是整数。 数字输入可操作以接收数字输入信号。 经修改的数字信号发生器插入在数字输入和数模转换器之间，并且响应于数字输入信号可操作以产生经修改的数字信号。 经修改的数字信号包括减轻数 - 模转换器的周期性误差的动态数字缓解部件。
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公开(公告)号：US07395290B2
公开(公告)日：2008-07-01
申请号：US10861867
申请日：2004-06-04
申请人： George S. Moore
发明人： George S. Moore
IPC分类号： G06F17/10
CPC分类号： H03H17/04 , H03H17/025
摘要： A digital filter and method of filtering frequency translate or shift a spectrum of a digital input signal and further filter a translated signal to reduce or attenuate frequency components in the spectrum of the input signal. The digital fitter includes first and second translators and a first filter. The first filter is connected between the first and second translators and is centered approximately at direct current (DC). The digital filter may further include a second filter, a third translator connected to an output of the second filter, a complex local oscillator connected to an input of each translator, and a complex-to-real converter connected to an output of the third translator. The method includes frequency translating the digital input signal and separately frequency translating a first translated signal after the first translated signal is filtered to produce a second translated signal.
摘要翻译： 数字滤波器和滤波方法对数字输入信号的频谱进行频率转换或移位，并进一步滤波转换的信号以减少或衰减输入信号的频谱中的频率分量。 数字滤波器包括第一和第二转换器和第一滤波器。 第一滤波器连接在第一和第二平移器之间，并且大致以直流（DC）为中心。 数字滤波器还可以包括第二滤波器，连接到第二滤波器的输出的第三转换器，连接到每个转换器的输入的复合本地振荡器，以及连接到第三转换器的输出的复数到实数转换器 。 该方法包括对数字输入信号进行频率转换，并且在第一转换信号被滤波以产生第二转换信号之后单独频率地平移第一转换信号。
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公开(公告)号：US5432474A
公开(公告)日：1995-07-11
申请号：US221910
申请日：1994-04-01
CPC分类号： H03F3/08 , H03F2200/372
摘要： An improved method and circuitry for processing high-impedance (current mode) input signals for use in translinear and other mode circuits in a manner that avoids the signal dependent bandwidth variations that occur in the prior art. A non-linear feedback structure using a transconductance gain element is employed to extend the bandwidth and/or suppress bandwidth variations encountered in the prior art. One application of this invention is the extension of Gilbert amplifier topologies, with their attendant normalization and integrated circuit implementation advantages, for operation with very low input signal levels to high bandwidth applications. A further extension in this invention allow this transconductance to be electrically adjusted to allow active bandwidth control or to compensate for signal sources with different input capacitances. The invention is particularly suitable for use as a preamplifier for pairs of sensed photodetector current signals.
摘要翻译： 一种改进的方法和电路，用于以避免现有技术中发生的依赖于信号的带宽变化的方式处理用于跨线路和其他模式电路的高阻抗（电流模式）输入信号。 使用使用跨导增益元件的非线性反馈结构来扩展现有技术中遇到的带宽和/或抑制带宽变化。 本发明的一个应用是扩展吉尔伯特放大器拓扑结构，具有随之而来的归一化和集成电路实现的优点，用于以非常低的输入信号电平操作到高带宽应用。 在本发明中的另一个扩展允许电跨越这种跨导电调节以允许有源带宽控制或用不同的输入电容补偿信号源。 本发明特别适合用作感测光电检测器电流信号对的前置放大器。
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公开(公告)号：US20080238747A1
公开(公告)日：2008-10-02
申请号：US11692128
申请日：2007-03-27
申请人： George S. Moore , Nico Lugil , Kenneth D. Poulton
发明人： George S. Moore , Nico Lugil , Kenneth D. Poulton
IPC分类号： H03M1/66
CPC分类号： H03M1/0609 , H03M1/0624 , H03M1/1028 , H03M1/1042 , H03M1/662
摘要： A digital-to-analog conversion system comprises a digital input, a digital-to-analog converter and a modified digital signal generator. The digital-to-analog converter has a conversion frequency and is subject to a periodic error having a periodicity equal to that of an N-th sub-harmonic of the conversion frequency, where N is an integer. The digital input is operable to receive a digital input signal. The modified digital signal generator is interposed between the digital input and the digital-to-analog converter and is operable in response to the digital input signal to generate a modified digital signal. The modified digital signal comprises a dynamic digital mitigation component that mitigates the periodic error of the digital-to-analog converter.
摘要翻译： 数模转换系统包括数字输入，数模转换器和经修改的数字信号发生器。 数模转换器具有转换频率，并且经受周期性误差，其周期性等于转换频率的第N次谐波的周期性，其中N是整数。 数字输入可操作以接收数字输入信号。 经修改的数字信号发生器插入在数字输入和数模转换器之间，并且响应于数字输入信号可操作以产生经修改的数字信号。 经修改的数字信号包括减轻数 - 模转换器的周期性误差的动态数字缓解部件。
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7.发明授权公开(公告)号：US07397865B2
公开(公告)日：2008-07-08
申请号：US10405555
申请日：2003-04-02
IPC分类号： H04L27/20
CPC分类号： H04L27/364
摘要： A system analyzer may generate an estimated frequency response of a device, system, communication medium, or combination thereof by utilizing a stimulus signal that is robust against IQ modulator impairments. A stimulus generator may be used to generate a plurality of discrete tones according to a frequency spacing and a frequency offset. The frequency spacing and the frequency offset cause spectrally inverted spurs (generated by impairments of the IQ modulator) to occur at frequencies other than frequencies of said modulated signal that are associated with said plurality of discrete tones. Additionally, by implementing a Discrete Fourier Transform (DFT) to possess a frequency resolution equal to the frequency offset, there is no leakage of power associated with the spectrally inverted spurs into frequency bins of the DFT associated with the desired frequency components. Likewise, leakage between the desired frequency components and leakage associated with the local oscillator may be avoided.
摘要翻译： 系统分析器可以通过利用针对IQ调制器损伤的鲁棒的刺激信号来生成设备，系统，通信介质或其组合的估计的频率响应。 刺激发生器可以用于根据频率间隔和频率偏移产生多个离散音调。 频率间隔和频率偏移导致频谱反转的杂散（由IQ调制器的损伤产生）发生在与所述多个离散音调相关联的所述调制信号的频率以外的频率处。 另外，通过实现具有等于频率偏移的频率分辨率的离散傅里叶变换（DFT），不存在与频谱反转的杂散相关联的功率泄漏到与期望的频率分量相关联的DFT的频率仓中。 同样，可以避免所需频率分量之间的泄漏和与本地振荡器相关的泄漏。
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公开(公告)号：US07038602B1
公开(公告)日：2006-05-02
申请号：US10977905
申请日：2004-10-30
申请人： George S. Moore
发明人： George S. Moore
IPC分类号： H03M1/06
CPC分类号： H03M1/1038 , H03M1/0836 , H03M1/1215
摘要： In one representative embodiment, scaling factors and delay values associated with respective analog-to-digital converters (ADCs) of an interleaved ADC are stored in memory. As a digital sample from the interleaved ADC is received, a respective amplitude scaling factor is retrieved from memory and applied to the digital sample. Preferably, a first order correction is then applied to the amplitude corrected-sample. The first order correction estimates the derivative using the current amplitude corrected sample and at least one additional amplitude corrected sample. The derivative is multiplied by an estimate of the respective timing delay associated with the particular sample. The corrected amplitude value is added to the multiple of the derivative and the timing delay to form the fully corrected digital sample.
摘要翻译： 在一个代表性实施例中，与交错ADC的相应模数转换器（ADC）相关联的缩放因子和延迟值被存储在存储器中。 当接收到来自交织的ADC的数字样本时，从存储器检索相应的幅度缩放因子并将其应用于数字样本。 优选地，将一阶校正应用于振幅校正样本。 第一阶校正使用当前幅度校正样本和至少一个附加振幅校正样本估计导数。 该导数乘以与特定样本相关联的相应定时延迟的估计。 将校正后的振幅值加到导数和定时延迟的倍数以形成完全校正的数字样本。
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公开(公告)号：US4802149A
公开(公告)日：1989-01-31
申请号：US943171
申请日：1986-12-18
申请人： George S. Moore
发明人： George S. Moore
摘要： Outputs of a linear phased array antenna can be employed for emitter field sorting, i.e., providing an indication of the frequency and angle of arrival of signals from a plurality of radiation sources, through the use of a two-dimensional optical processor that does not require a mechanism for correcting for acoustic spreading in a multi-channel Bragg cell. In effect, the multi-channel array of transducers of a Bragg cell forms a composite N-channel transducer the width of which is N times the spacing between channels. For a CW radiation source, the signal received by each array element undergoes an incremental phase shift associated with the tilt of the phase front across the array. When these signals are used to drive respectively adjacent transducers of a multi-channel Bragg cell, the acoustic effect within the bulk is equivalent to that of driving a large composite transducer with a constant frequency signal. This larger size of the effective composite transducer provides significantly reduced divergence of the composite acoustic wave, while the linear phase shift across the transducer results in a tilting of the composite acoustic wave. The two-dimensional acoustic wave modulation of a light beam passing through the Bragg cell is then imaged in the transform plane of a downstream Fourier transform lens, so as to produce a two-dimensional Fourier transform of the Bragg cell. In the transform plane there is provided a frequency display in the horizontal (parallel to the direction of travel of acoustic waves in the Bragg cell) direction and an angle of arrival (azimuth angle) display in the vertical direction. Multiple radiation sources at different locations may be processed independently through superposition.
摘要翻译： 线性相控阵天线的输出可用于发射体场分选，即通过使用不需要的二维光学处理器来提供来自多个辐射源的信号的频率和到达角度的指示 用于校正多通道布拉格单元中的声扩展的机构。 实际上，布拉格单元的多通道阵列的换能器形成了一个复合N沟道换能器，其宽度是通道间距的N倍。 对于CW辐射源，由每个阵列元件接收的信号经历与跨阵列的相位前沿的倾斜相关联的增量相移。 当这些信号用于分别驱动多通道布拉格单元的相邻换能器时，体内的声效与驱动具有恒定频率信号的大复合换能器相同。 这种较大尺寸的有效复合传感器提供了显着减小的复合声波的发散度，而穿过换能器的线性相移导致复合声波的倾斜。 然后通过布拉格单元的光束的二维声波调制在下游付里叶变换透镜的变换平面中成像，以便产生布拉格单元的二维傅里叶变换。 在变换平面中，在水平方向（平行于布拉格单元中的声波的行进方向）和在垂直方向上的到达角（方位角））显示频率显示。 可以通过叠加来独立地处理不同位置处的多个辐射源。
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公开(公告)号：US4198675A
公开(公告)日：1980-04-15
申请号：US907703
申请日：1978-05-19
申请人： George S. Moore
发明人： George S. Moore
CPC分类号： G02F1/113 , G06G7/20 , G02F2203/19
摘要： Linearization of a closed-loop acousto-optic modulation system is maintained over a uniform closed-loop bandwidth that is independent of the output light intensity level through the use of a compensating square-root function generator which employs the third quadrant characteristic of a MOSFET. The MOSFET may be connected as the feedback impedance of an operational amplifier which provides the square-root gain control function for complementing the non-linearity of the acousto-optic modulator. By utilizing the third quadrant characteristics of the source-to-drain voltage relative to the drain current of the MOSFET, the square-root function generator has a transfer function which insures that a linear relationship between modulator output light intensity and input signal current can be obtained irrespective of light intensity.In accordance with a preferred embodiment of the present invention, the operational amplifier of the square-root function generator may be supplied with an offset voltage in order to insure that the desired square-root transfer function can be attained regardless of differences in the manufactured characteristics of the field effect transistors that may be used. Temperature compensation circuitry may also be adopted as part of the square-root gain control component of the system to counteract the temperature sensitivity of the MOSFET's square-root current-voltage characteristic.
摘要翻译： 通过使用采用MOSFET的第三象限特性的补偿平方根函数发生器，闭环声光调制系统的线性化被保持在均匀的闭环带宽上，该带宽独立于输出光强度级。 MOSFET可以作为运算放大器的反馈阻抗来连接，该运算放大器提供用于补充声光调制器的非线性的平方根增益控制功能。 通过利用源极 - 漏极电压相对于MOSFET的漏极电流的第三象限特性，平方根函数发生器具有传递函数，确保调制器输出光强度和输入信号电流之间的线性关系可以是 无论光强度如何。 根据本发明的优选实施例，可以向平方根函数发生器的运算放大器提供偏移电压，以确保可以实现所需的平方根传递函数，而不管制造特性的差异如何 可以使用的场效应晶体管。 也可以采用温度补偿电路作为系统的平方根增益控制部件的一部分，以抵消MOSFET的平方根电流 - 电压特性的温度灵敏度。
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