Spectrum analyzer

Details Spectrum analyzer Spectrum analyzer

1996-12-31

1998-07-07

Do, Diep N.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 7623, 324 7627, G01R 2316

Patent

active

057774641

ABSTRACT:
The object of a spectrum analyzer of present invention is to increase a frequency stability and SPAN probability. A voltage control oscillator is rendered to a locked state based on a frequency as a reference frequency output from a direct digital synthesizer. Thereafter, the voltage control oscillator performs a sweep operation for a signal output therefrom, based on a frequency error to which a ramp signal is added by an adder, that is, based on the reference frequency output from the direct digital synthesizer.

REFERENCES:
patent: 4839582 (1989-06-01), Fukaya et al.
patent: 4839583 (1989-06-01), Takano et al.
patent: 4890099 (1989-12-01), Takano et al.
patent: 5038096 (1991-08-01), Obie et al.
patent: 5210483 (1993-05-01), Amamoto et al.

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