JPS5992863U - spectrum analyzer - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional spectrum analyzer, Figure 2
The figure is a timing chart of a conventional spectrum analyzer, Figure 3 is a diagram showing an example of a spectrum observed with a conventional spectrum analyzer, Figure 4 is a configuration diagram of a spectrum analyzer according to this invention, and Figure 5 is a diagram showing a spectrum analyzer according to this invention. FIG. 6 is a diagram showing an example of a spectrum observed by the spectrum analyzer according to this invention. In the figure, 1 is an input terminal, 2 is a mixer, 3 is an IF amplifier, and 4
is a variable BPF, 5 is a log amplifier, 6 is a detector, 7 is a video amplifier, 8 is a side wave generator, 9 is a sweep width control circuit, 10
1 is a center frequency control circuit, 11 is a sweep oscillator, 12 is a brightness control circuit, 13 is a CRT display, 14 is a variable BPF, 1
5 is an IF amplifier, 16 is a display signal switching circuit, 17 is a center frequency variable circuit, 18 is a display frequency comparison circuit, and 19 is a frequency control switching circuit. Note that the same or corresponding parts in the figures are given the same reference numerals. ('(2(3 5 O Fig. 2) (4(5(' I f2 I 13 Fig. 5

Claims (1)

[Scope of utility model registration request] a mixer that mixes a predetermined input signal with a sweep signal of a sweep oscillator; an IF amplifier that amplifies the output of the mixer; a variable bandpass filter that is connected to the output terminal of the IF amplifier and whose passband width can be varied; a log amplifier that inputs the output of the bandpass filter, a detector that detects the output of the log amplifier, a video amplifier 2 that amplifies the output of the detector, and a sidewave generator that generates a sidewave signal; a sweep width control circuit that inputs the sidewave signal of the sidewave generator, adjusts the amplitude of the sidewave signal, and controls the sweep width of the oscillation frequency of the sweep oscillator; and a sweep width control circuit that controls the sweep center frequency of the sweep oscillator. a center frequency control circuit that inputs the sidewave signal of the sidewave generator, a brightness control circuit that inputs the outputs of the video amplifier, sidewave generator, and brightness control circuit, and outputs the spectrum of the input signal. In a spectrum analyzer equipped with a display that displays the above I.
A variable bandpass filter for time axis observation connected to the output end of the F amplifier, an IF amplifier that amplifies the output of the variable bandpass filter for time axis observation, and an output of the IF amplifier or the output of the video amplifier. A display signal switching circuit for supplying either one of them to the display, a variable center frequency circuit for generating a time axis observation center frequency signal, an output of the variable band pass filter for time axis observation, and a sweep width during spectrum display. A signal creation circuit that creates a signal indicating a time axis observation range using the sweep width control signal of the control circuit and the output of the center frequency variable circuit, and supplies that signal to the brightness control circuit; A spectrum analyzer comprising a frequency control switching circuit that sends the output of the sweep width control circuit and the output of the variable center frequency circuit to the sweep oscillator during the time axis observation period.