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    Measuring method by spectrum analyzer
    1.
    发明授权
    Measuring method by spectrum analyzer 失效
    频谱分析仪测量方法

    公开(公告)号：US06229316B1

    公开(公告)日：2001-05-08

    申请号：US08707032

    申请日：1996-09-03

    申请人： Takayoshi Fukui ,  Kouichi Yamashita ,  Takahiro Yamaguchi ,  Osamu Aoyama ,  Takashi Kosuge ,  Yoshiaki Miyamae ,  Toshiharu Kasahara ,  Hiroaki Takaoku

    发明人： Takayoshi Fukui ,  Kouichi Yamashita ,  Takahiro Yamaguchi ,  Osamu Aoyama ,  Takashi Kosuge ,  Yoshiaki Miyamae ,  Toshiharu Kasahara ,  Hiroaki Takaoku

    IPC分类号： G01R2316

    CPC分类号： G01R23/16 ,  G01R29/26

    摘要： A spectrum analyzer in which automatic setting of parameters such as band width is done by the analyzer without manual operator input and noise measurements are determined and displayed to the operator. This is accomplished by an input signal being supplied to a frequency mixer via an input variable attenuator. The frequency of the input signal is mixed with the frequency of a local signal from a frequency sweep generator. The mixed signal is then supplied to a band pass filter and the output of the filter is amplified by an amplifier. The frequency of the amplified output is mixed with the frequency of a local signal from a local oscillator by a frequency mixer. The intermediate frequency signal is taken out by a band pass filter and the output is detected by a detector. The detected output is converted into a digital signal by an A/D converter after passing through a low pass filter and the digital signal is stored in a buffer memory. A CPU sets an attenuation amount. The CPU also controls a frequency sweep generator by controlling a ramp voltage generator through a timing controller. The CPU sets a sweep frequency band, a band width RBW, a band width VBW, and a sampling period, as well as a display control of the data stored in the buffer memory on a display unit.

    摘要翻译： 频谱分析仪，其中通过分析仪完成诸如带宽等参数的自动设置，无需手动操作员输入和噪声测量，并将其显示给操作者。 这通过经由输入可变衰减器被提供给混频器的输入信号来实现。 输入信号的频率与来自频率扫描发生器的本地信号的频率混合。 然后将混合信号提供给带通滤波器，并且滤波器的输出由放大器放大。 放大输出的频率通过混频器与来自本地振荡器的本地信号的频率混合。 中频信号由带通滤波器取出，输出由检测器检测。 在通过低通滤波器之后，A / D转换器将检测到的输出转换成数字信号，数字信号存储在缓冲存储器中。 CPU设置衰减量。 CPU还通过定时控制器控制斜坡电压发生器来控制频率扫描发生器。 CPU设置扫描频带，带宽RBW，带宽VBW和采样周期，以及在显示单元上存储在缓冲存储器中的数据的显示控制。

    Direct digital synthesizer driven phase lock loop spectrum analyzer
    3.
    发明授权
    Direct digital synthesizer driven phase lock loop spectrum analyzer 失效
    直接数字合成器驱动锁相环频谱分析仪

    公开(公告)号：US5818215A

    公开(公告)日：1998-10-06

    申请号：US634429

    申请日：1996-04-18

    申请人： Yoshiaki Miyamae ,  Hiroaki Takaoku ,  Osamu Aoyama

    发明人： Yoshiaki Miyamae ,  Hiroaki Takaoku ,  Osamu Aoyama

    IPC分类号： G01R23/173 ,  G01R13/24

    CPC分类号： G01R23/173

    摘要： A spectrum analyzer converts frequencies of an input signal using a local signal from a local signal generator, detects the frequency converted outputs, and sweeps the frequencies of said local signal generated by said local signal generator, to obtain a frequency-based output, wherein said local signal generator comprises a digital direct synthesizer for incrementing the output frequency for every input clock, a variable frequency oscillator for outputting an oscillation output as said local signal and a phase locked loop for controlling the oscillation frequency of said variable frequency oscillator using the output of said digital direct synthesizer as a reference signal.

    摘要翻译： 频谱分析器使用来自本地信号发生器的本地信号来转换输入信号的频率，检测变频输出，并扫描由所述本地信号发生器产生的所述本地信号的频率，以获得基于频率的输出，其中所述 本地信号发生器包括用于递增每个输入时钟的输出频率的数字直接合成器，用于输出振荡输出作为所述本地信号的可变频率振荡器和用于使用所述输出的输出控制所述可变频率振荡器的振荡频率的锁相环 所述数字直接合成器作为参考信号。