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    • 121. 发明授权
    • Measuring method by spectrum analyzer
    • 频谱分析仪测量方法
    • US06229316B1
    • 2001-05-08
    • US08707032
    • 1996-09-03
    • Takayoshi FukuiKouichi YamashitaTakahiro YamaguchiOsamu AoyamaTakashi KosugeYoshiaki MiyamaeToshiharu KasaharaHiroaki Takaoku
    • Takayoshi FukuiKouichi YamashitaTakahiro YamaguchiOsamu AoyamaTakashi KosugeYoshiaki MiyamaeToshiharu KasaharaHiroaki Takaoku
    • G01R2316
    • G01R23/16G01R29/26
    • 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.
    • 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。
    • 125. 发明授权
    • Apparatus for measurement by digital spectrum analyzer
    • 数字频谱分析仪测量装置
    • US4607216A
    • 1986-08-19
    • US654132
    • 1984-09-25
    • Takahiro YamaguchiMasayuki OgawaToshiharu Kasahara
    • Takahiro YamaguchiMasayuki OgawaToshiharu Kasahara
    • G01R27/28G01R23/16
    • G01R23/16
    • A frequency range of measurement is divided into a plurality of regions. For each region a test signal suitable for measurement of the region is generated independently, and the test signal is supplied to a device under test. The output of the device under test is converted by an AD converter into a digital signal, which is then subjected to fast Fourier transform. For each region the sensitivity of the AD converter is set for optimal conversion of the signal level at its input side by the converter, and then the fast Fourier transform is carried out. On the basis of the sensitivity set for one of the regions, the magnitude of the fast Fourier transform output in each of the other regions is corrected according to the sensitivities set for the other regions.
    • 测量的频率范围被分成多个区域。 对于每个区域,独立地生成适合于该区域的测量的测试信号,并且将测试信号提供给被测设备。 被测器件的输出由AD转换器转换为数字信号,然后进行快速傅里叶变换。 对于每个区域,AD转换器的灵敏度被设置用于通过转换器在其输入侧的信号电平的最佳转换,然后执行快速傅里叶变换。 基于为一个区域设置的灵敏度,根据为其他区域设置的灵敏度来校正每个其他区域中的快速傅里叶变换输出的幅度。