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1. 发明授权

US08249386B2 Video bandwidth resolution in DFT-based spectrum analysis 有权
标题翻译：基于DFT的频谱分析中的视频带宽分辨率
公开(公告)号：US08249386B2
公开(公告)日：2012-08-21
申请号：US12058546
申请日：2008-03-28
申请人： Yi He , Marcus K. Dasilva , Kathryn A. Engholm
发明人： Yi He , Marcus K. Dasilva , Kathryn A. Engholm
IPC分类号： G06K9/36
CPC分类号： G01R23/16
摘要： A method and apparatus for improved video bandwidth resolution in DFT-based spectrum analysis is disclosed. A first embodiment comprises an emulation of a continuous range of video bandwidths in DFT-based spectrum analysis using overlapping resolution bandwidth frames. A second embodiment utilizes frame weighting to reduce the standard deviation in the spectrum of noise signal to emulate a corresponding standard deviation of a specified video bandwidth.
摘要翻译：公开了一种在基于DFT的频谱分析中改进视频带宽分辨率的方法和装置。第一实施例包括使用重叠分辨率带宽帧在基于DFT的频谱分析中对视频带宽的连续范围的仿真。第二实施例利用帧加权来降低噪声信号频谱中的标准偏差，以模拟指定视频带宽的相应标准偏差。

2. 发明授权

US07649930B2 Filter equalization using magnitude measurement data 有权
标题翻译：使用幅度测量数据滤波均衡
公开(公告)号：US07649930B2
公开(公告)日：2010-01-19
申请号：US11272285
申请日：2005-11-09
申请人： Yi He , Thomas C. Hill, III , Marcus K. Dasilva
发明人： Yi He , Thomas C. Hill, III , Marcus K. Dasilva
IPC分类号： H03H7/30 , H03H7/40 , H03K5/159
CPC分类号： H04L27/00
摘要： A filter equalization technique for an analog signal path, such as in an instrument that simultaneously measures a signal over a band of frequencies, uses magnitude measurement data for high frequency bands for which phase-calibrated sources are not readily available. A sinusoidal signal source together with an accurate power meter is used to provide a stepped frequency input over a desired frequency band to the analog signal path with an accurate measured magnitude. The output of the analog signal path is digitized and the resulting frequency magnitudes are computed. Then the resulting power meter results are deducted from the frequency magnitudes measured each time by the instrument to determine the magnitude response of the analog signal path. Using a Hilbert transform the corresponding phase response is determined based on a minimum phase assumption over the desired frequency band. From the magnitude and phase responses an inverse or digital equalization filter may be designed for the analog signal path.
摘要翻译：用于模拟信号路径的滤波器均衡技术，例如在同时测量频带上的信号的仪器中，使用相位校准源不容易获得的高频带的幅度测量数据。使用正弦信号源与精确的功率计一起，以精确的测量幅度向模拟信号路径提供期望频带上的阶跃频率输入。将模拟信号路径的输出数字化，并计算得到的频率幅度。然后，由仪器每次测量的频率幅度中扣除所得的功率计结果，以确定模拟信号路径的幅度响应。使用希尔伯特变换，基于期望频带上的最小相位假设来确定相应的相位响应。根据幅度和相位响应，可以为模拟信号路径设计反相或数字均衡滤波器。

3. 发明授权

US5644260A RC/CR automatic quadrature network 失效
标题翻译： RC / CR自动正交网络
公开(公告)号：US5644260A
公开(公告)日：1997-07-01
申请号：US542745
申请日：1995-10-13
申请人： Marcus K. DaSilva , Andrew M. Teetzel
发明人： Marcus K. DaSilva , Andrew M. Teetzel
IPC分类号： H03H7/20 , H03C1/02 , H03C1/52 , H03C1/60 , H03C3/00 , H03C3/40 , H03C5/00 , H03D1/22 , H03D3/00 , H03H7/21 , H03H11/16 , H03H11/18 , H03H11/22 , H04L27/20 , H04L27/36
CPC分类号： H03C5/00 , H03C1/52 , H03C3/00 , H03C3/40 , H03H11/16 , H03H11/18 , H03H11/22 , H03C1/02 , H03C1/60 , H03C2200/0016 , H03C2200/0058 , H03D1/2245 , H03D3/007
摘要： An IQ modulator incorporates a quadrature network that is responsive to a frequency dependent control signal and that has in-phase and quadrature signals that are of equal amplitude and in exact quadrature over a wide range of applied frequencies. The quadrature network includes RC and CR phase shifters whose C's are fixed capacitors of equal value and whose R's are made equal to each other and to the capacitive reactance of the C's by the action of the frequency dependent control signal. The R's may be FET's. The frequency dependent control signal may be generated without express knowledge of the applied frequency by a servo loop that nulls out the amplitude difference between the in-phase and quadrature outputs from the quadrature network; it may also be generated from a look-up table as an express function of frequency. The frequency dependent control signal is split into separate instances that are applied to each R, and an offset may be introduced therebetween to provide extreme precision. The offset may be fixed or programmatically controlled as a function of frequency. Varactors may be used to provide variable C's in cooperation with fixed R's. The entire circuit may be fabricated as a GaAs IC for use in the frequency range of 200 MHz to 3 GHz.
摘要翻译： IQ调制器包括正交网络，该正交网络响应于频率相关的控制信号，并且具有同相和正交信号，它们在宽的施加频率范围内具有相等幅度和准确的正交。正交网络包括RC和CR相移器，其C是相等值的固定电容器，并且R通过频率相关控制信号的作用使得R相互相等并且与C的容性电抗相对应。 R的可能是FET的。频率相关控制信号可以在没有通过伺服环路的应用频率的明确知识的情况下产生，从而消除来自正交网络的同相和正交输出之间的幅度差异; 它也可以从查找表生成为频率的表达功能。频率相关控制信号被分割成分别应用于每个R的实例，并且可以在其间引入偏移以提供极高的精度。偏移可以是固定的或者作为频率的函数被编程地控制。 Varactors可以用于与固定R协作提供变量C。整个电路可以被制造为在200MHz至3GHz的频率范围内使用的GaAs IC。

4. 发明授权

US5105168A Vector locked loop 失效
标题翻译：矢量锁定循环
公开(公告)号：US5105168A
公开(公告)日：1992-04-14
申请号：US751458
申请日：1991-08-28
申请人： Marcus K. DaSilva
发明人： Marcus K. DaSilva
IPC分类号： H03L5/00 , H03C1/06 , H03D3/24 , H03F1/32 , H03L7/07 , H03L7/08 , H03L7/087 , H03L7/093
CPC分类号： H03L7/07 , H03C1/06 , H03D3/244 , H03F1/3247 , H03F1/3282 , H03L7/087 , H03F2200/438
摘要： A vector locked loop is disclosed having a topology somewhat similar to two cross coupled phase locked loops, but wherein both magnitude and phase are used as feedback signals. The output signal is generated by combining the outputs of two VCOs in a combiner network. This output signal is fed back to the input, where phase and magnitude detectors are used to generate error signals. These error signals are processed to yield control signals for controlling the frequencies of the two VCOs. The vector locked loop can be adapted for a number of applications, including frequency translation, modulation (phase, amplitude or arbitrary), and high efficiency linear power amplification.

5. 发明授权

US5093636A Phase based vector modulator 失效
标题翻译：基于相位的矢量调制器
公开(公告)号：US5093636A
公开(公告)日：1992-03-03
申请号：US588632
申请日：1990-09-25
申请人： Thomas M. Higgins, Jr. , Marcus K. DaSilva , Robert J. Conley
发明人： Thomas M. Higgins, Jr. , Marcus K. DaSilva , Robert J. Conley
IPC分类号： H04L27/36 , H03C5/00 , H03F1/02 , H04L27/20
CPC分类号： H03C5/00 , H03F1/0294
摘要： Vector modulation is effected by summing output signals from two phase modulators. The lack of amplitude modulation on the signals when summed permits non-linear processing of the signals, such as PLL frequency translation. In one embodiment, the phase modulators comprise fractional-N phase locked loops modulated with digital data words. In another, the phase modulators comprise direct digital synthesizers.

6. 发明授权

US4654610A PIN diode switched RF signal attenuator 失效
标题翻译： PIN二极管开关RF信号衰减器
公开(公告)号：US4654610A
公开(公告)日：1987-03-31
申请号：US758608
申请日：1985-07-23
申请人： Marcus K. Dasilva
发明人： Marcus K. Dasilva
IPC分类号： H03H7/24 , H03H7/25 , H01P1/22
CPC分类号： H03H7/25 , H03H7/255
摘要： A multi-path, ladder-type variable step RF signal attenuator is provided. The ladder network is comprised of a number of asymmetric power splitting elements and PI-pad resistor attenuator elements. The high-speed switching and long life characteristics of PIN diodes are utilized to switch resistive attenuator elements into or out of the ladder network to provide selectable values of signal attenuation.
摘要翻译：提供多路梯形式可变步长RF信号衰减器。梯形网络由多个非对称功率分离元件和PI-焊盘电阻器衰减器元件组成。使用PIN二极管的高速开关和长寿命特性来将电阻衰减器元件切换到梯形网络中或从梯形网络中切出以提供可选择的信号衰减值。

7. 发明授权

US4546331A Frequency modulation in a phase-locked loop 失效
标题翻译：锁相环中的频率调制
公开(公告)号：US4546331A
公开(公告)日：1985-10-08
申请号：US581767
申请日：1984-02-21
申请人： Marcus K. DaSilva , David P. Whipple , Robert E. Temple
发明人： Marcus K. DaSilva , David P. Whipple , Robert E. Temple
IPC分类号： H03C3/00 , H03C3/02 , H03C3/09 , H03L7/197
CPC分类号： H03C3/0975 , H03C3/0941 , H03C3/095 , H03L7/197 , H03C3/02
摘要： Apparatus is provided to frequency modulate (FM) RF carrier frequencies generated in a phase-locked loop (PLL). FM outside the loop bandwidth is AC coupled to the loop. FM within the loop bandwidth is DC coupled via an integrating OP-AMP to provide phase modulation. Whenever the output of the integrator exceeds a preset threshold, a prescaler removes or adds two pi (or integral multiples of two pi) radians of phase change from the input to the loop divide-by-N circuit. At the same time, a current source pumps charge into the integrator to exactly compensate for the amount of phase removed or added resetting the integrator. DC feedback around the integrating OP-AMP and a feedback signal proportional to the exact amount of phase added or removed provides a true synthesized loop center frequency with no drift. When the feedback path is interrupted, DC FM is provided.
摘要翻译：提供了在锁相环（PLL）中产生的频率调制（FM）RF载波频率的装置。 FM外环带宽是交流耦合到环路。环路带宽内的FM通过集成OP-AMP直流耦合，以提供相位调制。每当积分器的输出超过预设阈值时，预分频器将从输入到环路除N电路中移除或添加两个相位变化的pi（或两个π）的整数倍。同时，电流源将电荷泵送到积分器中，以精确地补偿去除的量或增加的积分器复位量。集成OP-AMP周围的DC反馈和与精确相位相加成正比的反馈信号提供了一个没有漂移的真正的合成回路中心频率。当反馈路径中断时，提供DC FM。

8. 发明授权

US07765086B2 Modulation domain trigger 有权
标题翻译：调制域触发
公开(公告)号：US07765086B2
公开(公告)日：2010-07-27
申请号：US11009161
申请日：2004-12-09
申请人： Alfred K. Hillman, Jr. , Marcus K. Dasilva , Edward C. Gee , Yi He
发明人： Alfred K. Hillman, Jr. , Marcus K. Dasilva , Edward C. Gee , Yi He
IPC分类号： G06F11/30
CPC分类号： G01R23/16 , G01R13/0263
摘要： A modulation domain trigger generator demodulates a modulated input signal to extract information content, and a trigger is generated from the extracted information content in response to specified trigger criteria. The modulation domain trigger generator may be combined with a plurality of different types of trigger generators, including frequency domain and time domain trigger generators, to process the input signal in response to different trigger criteria to produce more than one trigger. The different trigger outputs may be combined to produce an acquisition trigger to acquire data surrounding an anomalous or identifiable event within the input signal.
摘要翻译：调制域触发发生器解调调制输入信号以提取信息内容，并且响应于指定的触发标准从所提取的信息内容产生触发。调制域触发发生器可以与多个不同类型的触发发生器组合，包括频域和时域触发发生器，以响应于不同的触发标准处理输入信号以产生多于一个的触发。可以组合不同的触发输出以产生采集触发以获取围绕输入信号内的异常或可识别事件的数据。

9. 发明授权

US06215448B1 Broadband coupler for measurement of antenna signals 失效
标题翻译：用于测量天线信号的宽带耦合器
公开(公告)号：US06215448B1
公开(公告)日：2001-04-10
申请号：US09365370
申请日：1999-07-30
申请人： Marcus K. DaSilva , Ryan Lowell Hendrickson
发明人： Marcus K. DaSilva , Ryan Lowell Hendrickson
IPC分类号： H01Q128
CPC分类号： H01P5/183 , H04B17/16 , H04B17/20
摘要： A selected length of antenna for a device under test is placed within a conductive inner cylinder, forming an unterminated “input” coaxial transmission line. The inner cylinder is in turn within and coaxial with a conductive outer cylinder, forming an “output” transmission line. The inner cylinder is the center conductor of the output transmission line, and in a region extending beyond the extent of the antenna therein, conically tapers to being a normal center conductor of solid cross section. The outer cylinder matches this taper to maintain a constant characteristic impedance Z0out (say, 50 &OHgr;) for the output transmission line, which then delivers its output signal to a matched terminating load in measurement equipment via either a coaxial connector or an interconnecting length of auxiliary transmission line. These triaxially nested input and output transmission lines are supported at a driven end by an RF tight box that contains a mounting fixture to support the device under test in a fixed and appropriate relation to the triaxially nested input and output transmission lines, and that is lined with anechoic RF absorbing material.
摘要翻译：被测器件的选定长度的天线被放置在导电内筒内，形成未端接的“输入”同轴传输线。内筒又与导电外筒同轴，形成“输出”传输线。内筒是输出传输线的中心导体，并且在延伸超过天线的范围的区域中，锥形成为固体截面的正常中心导体。外筒与这个锥形匹配，以保持输出传输线的恒定特性阻抗Z0out（例如，50欧米加），然后输出信号通过同轴连接器或互连长度的辅助装置将其输出信号传递到测量设备中匹配的终端负载传输线。这些三轴嵌套输入和输出传输线在被驱动端由一个RF紧固盒支撑，该RF封闭盒包含一个安装夹具，以与三轴嵌套的输入和输出传输线固定和适当的关系支撑待测设备，具有消声射频吸收材料。

10. 发明授权

US5150082A Center frequency calibration for DC coupled frequency modulation in a phase-locked loop 失效
标题翻译：锁相环中直流耦合频率调制的中心频率校准
公开(公告)号：US5150082A
公开(公告)日：1992-09-22
申请号：US839826
申请日：1992-02-21
申请人： Scott B. Grimmett , David P. Whipple , Marcus K. DaSilva
发明人： Scott B. Grimmett , David P. Whipple , Marcus K. DaSilva
IPC分类号： H03C3/02 , H03C3/09
CPC分类号： H03C3/0991 , H03C3/0925 , H03C3/0933 , H03C3/0941 , H03C3/095 , H03C3/0975 , H03C2200/0029 , H03C3/02
摘要： A method of providing DC coupled frequency modulation without center frequency offset of a RF carrier frequency generated in a phase-locked loop circuit. The circuit is automatically calibrated to generate a feedback signal for cancelling DC offsets at the input of the coupling integrator with a digital-to-analog converter and resistor network driven by a digital counter. After removing frequency modulation, the coupling integrator's output will ramp while the offsets remain uncancelled. Incrementing or decrementing the digital counter in response to the integrator's output will adjust the feedback signal until the offsets are cancelled and the integrator ceases to ramp. The counter value is stored in a memory to allow subsequent presetting of the feedback signal to the calibrated magnitude. Holding the feedback signal constant thereafter during DC coupled frequency modulation keeps the RF carrier at center frequency.
摘要翻译：提供直流耦合频率调制的方法，而不需要在锁相环电路中产生的RF载波频率的中心频率偏移。该电路被自动校准，以产生一个反馈信号，用于通过由数字计数器驱动的数模转换器和电阻网络在耦合积分器的输入端消除DC偏移。在去除频率调制后，耦合积分器的输出将斜坡，而偏移量保持不变。响应于积分器的输出而递增或递减数字计数器将调整反馈信号直到抵消偏移量并且积分器停止斜坡。计数器值存储在存储器中，以允许将反馈信号的后续预设置为校准的量值。在DC耦合频率调制期间保持反馈信号恒定，使RF载波保持在中心频率。

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