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    • 5. 发明授权
    • Signal generator
    • 信号发生器
    • US06316943B1
    • 2001-11-13
    • US09469541
    • 1999-12-22
    • Hideki YamashitaKazuyuki Yagi
    • Hideki YamashitaKazuyuki Yagi
    • G01R2702
    • G01R3/00H03B19/00H03B23/00
    • Apparatus is described for generating a frequency-sweepable measurement signal and a local signal with a frequency separated from the measurement signal frequency by an intermediate frequency. The measurement signal and a local signal are generated by a simple structure, including a high-frequency variable-frequency signal source, a low-frequency fixed-frequency signal source, a first frequency divider and a second frequency divider. The variable-frequency signal source is a sweepable signal source. The first frequency divider divides an output frequency fa from the variable-frequency signal source by n and outputs a measurement signal with a frequency of fa/n. The signal of the variable-frequency signal source is also applied to the first input of the second frequency divider, and the signal of fixed-frequency signal source, with a frequency of fb, is applied to the second input. The second frequency divider removes a one period signal from the signal of the variable-frequency signal source each period of the signal of fixed-frequency signal source, thus obtaining a signal with a frequency of fa−fb. This latter signal is divided by n and a signal with a frequency of (fa−fb)/n is output as the local frequency. fb/n is the intermediate frequency.
    • 描述了用于产生频率可扫描测量信号和具有从测量信号频率与中频分离的频率的本地信号的装置。 测量信号和本地信号由包括高频可变频率信号源,低频固定频率信号源,第一分频器和第二分频器的简单结构产生。 可变频率信号源是可扫描信号源。 第一分频器将可变频率信号源的输出频率fa除以n,并输出频率为fa / n的测量信号。 可变频率信号源的信号也被施加到第二分频器的第一输入,并且频率为fb的固定频率信号源的信号被施加到第二输入。 第二分频器从固定频率信号源的每个周期的可变频率信号源的信号中去除一个周期信号,从而获得频率为fa-fb的信号。 将后一个信号除以n,输出频率为(fa-fb)/ n的信号作为本地频率。 fb / n是中频。
    • 9. 发明授权
    • Signal generator
    • 信号发生器
    • US6028425A
    • 2000-02-22
    • US782722
    • 1997-01-13
    • Hideki YamashitaKazuyuki Yagi
    • Hideki YamashitaKazuyuki Yagi
    • G01R27/02G01R3/00G01R27/28H03B19/00H03B21/01H03B23/00H03B25/00G01R19/18
    • G01R3/00H03B19/00H03B23/00
    • Apparatus is described for generating a frequency-sweepable measurement signal and a local signal with a frequency separated from the measurement signal frequency by an intermediate frequency. The measurement signal and a local signal are generated by a simple structure, including a high-frequency variable-frequency signal source, a low-frequency fixed-frequency signal source, a first frequency divider and a second frequency divider. The variable-frequency signal source is a sweepable signal source. The first frequency divider divides an output frequency fa from the variable-frequency signal source by n and outputs a measurement signal with a frequency of fa/n. The signal of the variable-frequency signal source is also applied to the first input of the second frequency divider, and the signal of fixed-frequency signal source, with a frequency of fb, is applied to the second input. The second frequency divider removes a one period signal from the signal of the variable-frequency signal source each period of the signal of fixed-frequency signal source, thus obtaining a signal with a frequency of fa-fb. This latter signal is divided by n and a signal with a frequency of (fa-fb)/n is output as the local frequency. fb/n is the intermediate frequency.
    • 描述了用于产生频率可扫描测量信号和具有从测量信号频率与中频分离的频率的本地信号的装置。 测量信号和本地信号由包括高频可变频率信号源,低频固定频率信号源,第一分频器和第二分频器的简单结构产生。 可变频率信号源是可扫描信号源。 第一分频器将可变频率信号源的输出频率fa除以n,并输出频率为fa / n的测量信号。 可变频率信号源的信号也被施加到第二分频器的第一输入,并且频率为fb的固定频率信号源的信号被施加到第二输入。 第二分频器从固定频率信号源的每个周期的可变频率信号源的信号中去除一个周期信号,从而获得频率为fa-fb的信号。 将后一个信号除以n,输出频率为(fa-fb)/ n的信号作为本地频率。 fb / n是中频。
    • 10. 发明授权
    • Method for improving signal generator frequency precision using counters
    • 使用计数器提高信号发生器频率精度的方法
    • US5929670A
    • 1999-07-27
    • US782846
    • 1997-01-13
    • Hideki Yamashita
    • Hideki Yamashita
    • G01R27/02G01R27/28H03L7/06H03B19/00
    • G01R27/28
    • A method for improving the precision of a signal generator utilizing counters. The difference between an external standard signal frequency and an internal standard frequency is measured by digital counters. The signal of this internal standard frequency signal source is counted by a first counter and the frequency of an external standard frequency signal source is counted by a second counter. A calculating and control part determines the accurate frequency of internal standard frequency signal source from count values of both counters. The measurement frequency signal source generates a signal with the desired frequency. The circuit is digitally implemented.
    • 一种提高信号发生器利用计数器精度的方法。 外部标准信号频率和内部标准频率之间的差异由数字计数器测量。 该内部标准频率信号源的信号由第一计数器计数,外部标准频率信号源的频率由第二计数器计数。 计算和控制部分从两个计数器的计数值确定内部标准频率信号源的精确频率。 测量频率信号源产生具有所需频率的信号。 电路是数字实现的。