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    Frequency generator including direct digital synthesizer and signal processor including the same
    1.
    发明授权
    Frequency generator including direct digital synthesizer and signal processor including the same 有权
    频率发生器包括直接数字合成器和包括相同的信号处理器

    公开(公告)号：US08699985B1

    公开(公告)日：2014-04-15

    申请号：US12770622

    申请日：2010-04-29

    Applicant: Wing J. Mar

    Inventor： Wing J. Mar

    IPC: H04B1/26 ,  H04B15/00

    CPC classification number: G06F1/0328 ,  G06F2211/902

    Abstract: A signal processor includes a frequency generator that employs a direct digital synthesizer (DDS) to generate a first local oscillator (LO) signal with a variable first LO frequency. The signal processor also includes an oscillator generating a second LO signal having a second LO frequency. The DDS employs programmable frequency control word and a sampling clock signal having a variable sampling clock frequency that is derived from the second LO frequency, to generate a DDS output signal from which the first LO signal is produced. The variable sampling clock frequency and the programmable frequency control word are selected to avoid crossing spurs in the frequency spectrum of the DDS output signal.

    Abstract translation: 信号处理器包括使用直接数字合成器（DDS）产生具有可变的第一LO频率的第一本地振荡器（LO）信号的频率发生器。 信号处理器还包括产生具有第二LO频率的第二LO信号的振荡器。 DDS采用可编程频率控制字和具有从第二LO频率导出的可变采样时钟频率的采样时钟信号，以产生产生第一LO信号的DDS输出信号。 选择可变采样时钟频率和可编程频率控制字，以避免在DDS输出信号的频谱中交叉杂波。

    High performance dual-YTO microwave synthesizer
    5.
    发明授权
    High performance dual-YTO microwave synthesizer 失效
    高性能双YTO微波合成器

    公开(公告)号：US06373344B1

    公开(公告)日：2002-04-16

    申请号：US09733877

    申请日：2000-12-08

    Applicant: Wing J. Mar

    Inventor： Wing J. Mar

    IPC: H03B518

    CPC classification number: H03L7/23 ,  H03B21/02 ,  H03L7/099 ,  H03L7/22

    Abstract: A microwave synthesizer apparatus features very low phase noise, fine frequency resolution and wide tuning range coverage. The microwave synthesizer apparatus utilizes a fundamental offset source in an offset phase lock loop (PLL) to translate an output signal Fout to a lower IF signal Fif for locking to a low frequency interpolation signal Fint. The use of the fundamental offset source instead of the conventional multiple frequency offset signal from a comb generator or sampler results in superior phase noise and spurious performance. The synthesizer comprises a main signal loop having a main loop VCO that produces an output signal Fout and an offset signal loop having an offset VCO that produces an output signal Fos. The signals Fos and Fout are mixed in the main loop to control the frequency of the signal Fout. The main loop VCO and the offset loop VCO preferably are YIG-tuned Oscillators (YTOs) that share a main coil. Moreover, the main YTO and the offset YTO preferably have a common housing and further, each of the main YTO and the offset YTO has a separate FM coil. The use of a dual YTO in the microwave synthesizer apparatus minimizes overall cost and power consumption of the synthesizer by combining the dual YTO in the single package. In one embodiment, the microwave synthesizer further comprises a mode selection feature that selects between operation of the synthesizer in an offset or dual loop mode and a variable divider or single loop mode. In another embodiment, the microwave synthesizer further comprises a selectable frequency divider that produces the output signal Fos with a smaller frequency step size.

    Abstract translation: 微波合成器具有非常低的相位噪声，精细的频率分辨率和宽的调谐范围覆盖。 微波合成器装置利用偏移锁相环（PLL）中的基波偏移源来将输出信号Fout转换成较低的IF信号Fif，用于锁定到低频内插信号Fint。 使用基本偏移源而不是来自梳状发生器或采样器的常规多频偏移信号导致优异的相位噪声和杂散性能。 合成器包括主信号环路，其具有产生输出信号Fout的主环路VCO和具有产生输出信号Fos的偏移VCO的偏移信号环路。 信号Fos和Fout在主回路中混合以控制信号Fout的频率。 主回路VCO和偏移环路VCO优选地是共享主线圈的YIG调谐振荡器（YTO）。 此外，主YTO和偏移YTO优选地具有公共壳体，并且进一步，主YTO和偏移YTO中的每一个具有单独的FM线圈。 在微波合成器装置中使用双重YTO通过将单个包装中的双重YTO组合来最小化合成器的总成本和功耗。 在一个实施例中，微波合成器还包括模式选择特征，其在偏移或双环路模式中的合成器的操作和可变分频器或单回路模式之间进行选择。 在另一个实施例中，微波合成器还包括可选择的分频器，其产生具有较小频率步长的输出信号Fos。

    Frequency generator and method of frequency generation with multiple sampling phase detectors
    6.
    发明授权
    Frequency generator and method of frequency generation with multiple sampling phase detectors 有权
    频率发生器和多采样相位检波器频率发生方法

    公开(公告)号：US07940130B2

    公开(公告)日：2011-05-10

    申请号：US12470559

    申请日：2009-05-22

    Applicant: Wing J. Mar

    Inventor： Wing J. Mar

    IPC: H03L7/00

    CPC classification number: H03L7/16 ,  H03L2207/12

    Abstract: A device includes: a plurality of sampling phase detectors, each receiving a sampling signal and a VCO output signal and in response thereto outputting a beat signal representing a frequency and phase difference between the VCO output signal and the sampling signal; a frequency/phase detector receiving a reference signal and a combined beat signal produced by combining the beat signals, and in response thereto producing an error signal representing a phase difference between the reference signal and the combined beat signal; a loop integrator receiving the error signal and in response thereto producing the VCO control signal; a power detector detecting a power level of the combined beat signal; and at least one offset voltage generator adjusting a value of a bias voltage in response to the detected power level of the combined beat signal, and applying the adjusted bias voltage to one of the sampling phase detectors.

    Abstract translation: 一种装置包括：多个采样相位检测器，每个采样相位检测器接收采样信号和VCO输出信号，响应于此，输出表示VCO输出信号和采样信号之间的频率和相位差的差拍信号; 接收参考信号的频率/相位检测器和通过组合拍频信号产生的组合拍频信号，并响应于此产生表示参考信号和组合拍频信号之间的相位差的误差信号; 接收所述误差信号并响应于此产生所述VCO控制信号的环路积分器; 功率检测器，检测组合的搏动信号的功率电平; 以及至少一个偏移电压发生器，响应于所检测的组合搏动信号的功率电平来调节偏置电压的值，以及将调整的偏置电压施加到采样相位检测器之一。

    Vector network analysis system and method using offset stimulus signals
    7.
    发明授权
    Vector network analysis system and method using offset stimulus signals 失效
    矢量网络分析系统和使用偏移刺激信号的方法

    公开(公告)号：US07518353B2

    公开(公告)日：2009-04-14

    申请号：US11400546

    申请日：2006-04-07

    Applicant: Hassan Tanbakuchi ,  Wing J. Mar

    Inventor： Hassan Tanbakuchi ,  Wing J. Mar

    IPC: G01R25/00

    CPC classification number: G01R27/28 ,  G01R31/2841

    Abstract: A vector network analysis system and a method of measuring use offset stimulus signals to stimulate a balanced device under test (DUT) to determine performance parameters. The system includes an offset stimulus source that provides a plurality of stimulus signals and a vector network analyzer. At least one stimulus signal is offset from another stimulus signal of the plurality in one or both of frequency and time-varying phase. The offset stimulus source includes a first signal source and a second signal source that respectively provides the offset stimulus signals. The method of measuring includes generating the offset stimulus signals and applying the offset stimulus signals to a balanced port of the DUT to stimulate the DUT. The performance parameters are determined from measurements of the offset stimulus signals and one or more response signals from the stimulated DUT.

    Abstract translation: 矢量网络分析系统和测量使用偏移刺激信号以刺激被测试的平衡器件（DUT）以确定性能参数的方法。 该系统包括提供多个刺激信号的偏移刺激源和矢量网络分析器。 在频率和时变相位中的一个或两个中，至少一个刺激信号偏离多个的另一激励信号。 偏移刺激源包括分别提供偏移刺激信号的第一信号源和第二信号源。 测量的方法包括产生偏移刺激信号并将偏移刺激信号施加到DUT的平衡端口以刺激DUT。 性能参数由偏移刺激信号的测量和来自受激DUT的一个或多个响应信号确定。

    Dual-oscillator signal synthesizer having high frequency offset stage
    8.
    发明授权
    Dual-oscillator signal synthesizer having high frequency offset stage 有权
    具有高频偏置级的双振荡器信号合成器

    公开(公告)号：US06992531B2

    公开(公告)日：2006-01-31

    申请号：US10681811

    申请日：2003-10-06

    Applicant: Wing J. Mar

    Inventor： Wing J. Mar

    IPC: H03L7/22

    CPC classification number: H03L7/22 ,  H03B21/02 ,  H03L7/099

    Abstract: A signal synthesizer includes a high frequency offset stage having a high frequency offset source and frequency translation element in the feedback path of a dual-oscillator offset loop synthesizer. The signal synthesizer achieves low phase noise via noise cancellation when used to provide the first local oscillator of a spectrum analyzer and when the second local oscillator of the spectrum analyzer provides the high frequency offset source to the signal synthesizer.

    Abstract translation: 信号合成器包括在双振荡器偏移环合成器的反馈路径中具有高频偏移源和频率转换元件的高频偏移级。 当信号合成器用于提供频谱分析仪的第一本地振荡器时，以及当频谱分析仪的第二本地振荡器向信号合成器提供高频偏移源时，通过噪声消除实现低相位噪声。

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