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    • 5. 发明申请
    • FREQUENCY-SCALABLE SHOCKLINE-BASED VNA
    • 基于频率可调的基于键盘的VNA
    • US20110306314A1
    • 2011-12-15
    • US12813337
    • 2010-06-10
    • Karam Michael NoujeimJon S. Martens
    • Karam Michael NoujeimJon S. Martens
    • H04B17/00
    • G01R31/2841G01R27/32
    • A high-frequency VNA system is provided using non-linear transmission line (NLTL or shockline) based samplers configured to provide scalable operation characteristics. Scaling to adjust noise performance vs. frequency is accomplished as follows: (1) increasing or decreasing the fall time of a shockline's output voltage waveform. This is accomplished by changing the number of Schottky varactors in a shockline, as well as changing the shockline's Bragg cutoff frequency by setting the spacing between Schottky varactors; (2) changing the structure of the pulse-forming network connected with the sampler by changing the length of the differentiator arms in the sampler pulse-forming network; and (3) changing the LO signal frequency applied to the shockline. Multiple NLTL based samplers are multiplexed to form a broadband reflectometer with the multiplexing circuitry selectively connecting one of the NLTL based sampler segments at a time to allow user selection of a desired performance vs. frequency response for each segment.
    • 使用基于非线性传输线(NLTL或冲击线)的采样器提供高频VNA系统,其被配置为提供可扩展的操作特性。 调整噪声性能与频率的比例可达到以下几点:(1)增加或减少冲击线输出电压波形的下降时间。 这是通过改变冲击线中肖特基变容二极管的数量,以及通过设置肖特基变容二极管之间的间距来改变冲击线的布拉格截止频率来实现的。 (2)通过改变采样器脉冲形成网络中的微分器臂的长度来改变与取样器连接的脉冲形成网络的结构; 和(3)改变施加到冲击线的LO信号频率。 多个基于NLTL的采样器被多路复用以形成宽带反射计,多路复用电路一次有选择地连接一个基于NLTL的采样器段,以允许用户选择每个段的期望性能与频率响应。
    • 6. 发明申请
    • CHARACTERIZING TEST FIXTURES
    • 表征测试仪器
    • US20080258738A1
    • 2008-10-23
    • US11738265
    • 2007-04-20
    • Jon S. MartensDavid V. Judge
    • Jon S. MartensDavid V. Judge
    • G01R35/00G01R27/28
    • G01R35/005G01R27/28
    • Provided herein are techniques for characterizing a test fixture that is used for connecting a device under test (DUT) to a vector network analyzer (VNA), e.g., to thereby enable de-embedding of the test fixture from measurements of the DUT connected to the test fixture. In an embodiment, the test fixture is separated into 4-port test fixture segments, based on which ports of the DUT have internal coupling. Each test fixture segment has an outer 2-port reference plane and an inner 2-port reference plane. A 4-port calibration is performed at outer planes of the two test fixture segments, while corresponding ports of the inner planes of the test fixture segments are connected together with thru segments, to thereby determine a thru set of S-parameters. A set of S-parameters is determined for each of the 4-port test fixture segments, based on the thru set of S-parameters.
    • 本文提供了用于表征用于将被测设备(DUT)连接到矢量网络分析仪(VNA)的测试夹具的技术,例如,从而能够将测试夹具从与连接到 测试夹具 在一个实施例中,基于DUT的哪些端口具有内部耦合,测试夹具被分成4端口测试夹具段。 每个测试夹具段具有外部2端口参考平面和内部2端口参考平面。 在两个测试夹具段的外平面上执行4端口校准,而测试夹具段的内平面的相应端口通过段连接在一起,从而确定一组S参数。 基于S参数的集合,为每个4端口测试夹具段确定一组S参数。
    • 7. 发明授权
    • Probe tone S-parameter measurements
    • 探头音S参数测量
    • US06943563B2
    • 2005-09-13
    • US10138989
    • 2002-05-02
    • Jon S. Martens
    • Jon S. Martens
    • G01R27/28H04B17/00G01R35/00
    • G01R27/28H04B17/20
    • An S-parameter measurement technique allows measurement of devices under test (DUTs), such as power amplifiers, which require a modulated power tone drive signal for proper biasing, in combination with a probe tone test signal, wherein both the modulated and probe tone signals operate in the same frequency range. The technique uses a stochastic drive signal, such as a CDMA or WCDMA modulated signal in combination with a low power probe tone signal. A receiver in a VNA having a significantly narrower bandwidth than the modulated signal bandwidth enables separation of the modulated and probe tone signals. VNA calibration further improves the measurement accuracy. For modulated signals with a significant power level in the frequency range of the probe tone signal, ensemble averaging of the composite probe tone and power tone signals is used to enable separation of the probe tone signal for measurement.
    • S参数测量技术允许测量被测设备(DUT),例如功率放大器,其需要调制功率音调驱动信号以进行适当的偏置,与探测音测试信号相结合,其中调制和探测音调信号 在相同的频率范围内工作。 该技术使用随机驱动信号,例如CDMA或WCDMA调制信号与低功率探测音调信号的组合。 具有比调制信号带宽明显更窄的带宽的VNA中的接收机能够分离调制和探测音调信号。 VNA校准进一步提高了测量精度。 对于在探测音信号的频率范围内具有显着功率电平的调制信号,使用复合探测音和功率乐音信号的整体平均来使探测音信号分离以进行测量。
    • 8. 发明授权
    • Methods for determining characteristics of interface devices used with vector network analyzers
    • 用于确定与矢量网络分析仪一起使用的接口设备特性的方法
    • US06650123B2
    • 2003-11-18
    • US10050305
    • 2002-01-15
    • Jon S. Martens
    • Jon S. Martens
    • G01R2728
    • G01R27/28
    • Methods are provided for characterizing N interface devices (e.g., adapters or test fixture arms) using a vector network analyzer (VNA). These N interface devices are useful for connecting an N-port device under test (DUT) to the VNA. A first step of includes performing an N-port calibration at each of N outer reference planes. A second step includes performing an N-port calibration at each of N inner reference planes. A set of scattering-parameters (S-parameters) is then determined for each of the N interface devices based on results of the calibrations performed at the first step and results of the calibrations performed at the second step. Each set of S-parameters characterizes a respective one of the N interface devices.
    • 提供了使用矢量网络分析仪(VNA)表征N个接口设备(例如,适配器或测试夹具臂)的方法。 这些N接口设备可用于将被测试的N端口设备(DUT)连接到VNA。 第一步包括在N个外部参考平面中的每一个处执行N端口校准。 第二步包括在N个内部参考平面中的每一个执行N端口校准。 然后基于在第一步骤执行的校准结果和在第二步骤执行的校准结果,确定每个N个接口设备的一组散射参数(S参数)。 每组S参数表示N个接口设备中的相应一个。
    • 10. 发明申请
    • VARIABLE GAIN CONTROL FOR HIGH SPEED RECEIVERS
    • 高速接收机的可变增益控制
    • US20110013733A1
    • 2011-01-20
    • US12505413
    • 2009-07-17
    • Jon S. MartensHelen ChauDavid A. Rangel-GuzmanPeter M. KapetanicDan Levasseur
    • Jon S. MartensHelen ChauDavid A. Rangel-GuzmanPeter M. KapetanicDan Levasseur
    • H04L27/08
    • H03G3/3068
    • A high speed receiver is provided using two parallel processing paths to enable rapid variable gain control. The parallel processing paths include a first processing path using a high resolution Discrete Fourier Transform (DFT), and a second processing path using a reduced DFT requiring fewer samples than the high resolution DFT. An initial sample of the data is processed using the second processing path with the reduced DFT by comparing a Fourier transform of the initial sample with predetermined threshold values. As a result of the comparison of the Fourier transform of the initial sample with the predetermined threshold values, a gain determination block determines whether a requirement exists for gain ranging. If gain ranging is needed, the gain of the data signal is adjusted and the gain ranging process repeats.
    • 使用两个并行处理路径提供高速接收机,以实现快速可变增益控制。 并行处理路径包括使用高分辨率离散傅里叶变换(DFT)的第一处理路径,以及使用与高分辨率DFT相比需要较少样本的减少的DFT的第二处理路径。 通过将初始样本的傅立叶变换与预定阈值进行比较,使用具有减小的DFT的第二处理路径来处理数据的初始样本。 作为初始样本的傅里叶变换与预定阈值的比较的结果,增益确定块确定是否存在增益测距的要求。 如果需要增益测距,则调整数据信号的增益,并重复增益测距过程。