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Frequency spectrum analyzer having time domain analysis function

  • US 6,233,529 B1
  • Filed: 10/06/1998
  • Issued: 05/15/2001
  • Est. Priority Date: 10/14/1997
  • Status: Expired due to Fees
First Claim
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1. A spectrum analyzer having a sweep local oscillator for analyzing frequency spectrum of an input signal, comprising:

  • a continuous period measurement block for continuously measuring each time period of an IF (intermediate frequency) signal produced by mixing the input signal and the local oscillator signal; and

    means for processing the data representing the continuous time period produced by the continuous period measurement block to analyze the input signal in a time domain;

    wherein the continuous period measurement block comprising;

    a divider for dividing a frequency of the IF signal by a predetermined ratio;

    a fractional time measurement circuit for measuring a time length of fractional time produced between an edge of the IF signal and a reference clock pulse by expanding the fractional time;

    a fractional time controller for controlling an operation of measuring the fractional time by the fractional time measurement circuit;

    a counter for counting the number of reference clock pulse during the time period of the IF signal including the fractional time expanded by the fractional time measurement circuit;

    a memory for storing data showing the time period obtained by the counter; and

    an address counter for generating address data for the memory.

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