Frequency spectrum analyzer with high C/N ratio

Details Frequency spectrum analyzer with high C/N ratio Frequency spectrum analyzer with high C/N ratio

1998-10-13

2000-12-26

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 7622, G01R 1324

Patent

active

061665339

ABSTRACT:
A frequency spectrum analyzer having an improved carrier to noise ration for analyzing frequency spectrum of an input signal. The spectrum analyzer includes a first frequency converter formed of a first frequency mixer, a first IF (intermediate frequency) filter and a first local signal oscillator; a second frequency converter; a third frequency converter formed of a third frequency mixer, a third IF filter and a third local signal oscillator; a frequency divider for dividing a frequency of the first local signal by a factor of N; a frequency multiplier for multiplying a frequency of the third local signal; a fourth frequency mixer which is provided with a divided frequency signal from the frequency divider as a fourth local signal; and a fifth frequency mixer which mixes the input signal to be analyzed and a multiplied frequency signal from the frequency multiplier as a fifth local signal and provides a frequency converted input signal to the fourth frequency mixer; where the fourth frequency mixer mixes the fourth local signal and the frequency converted input signal and provides a resultant IF signal to the third frequency converter.

REFERENCES:
patent: 4672308 (1987-06-01), Leikus
patent: 4710702 (1987-12-01), Itaya et al.
patent: 5168213 (1992-12-01), Wardle et al.
patent: 5736845 (1998-04-01), Kosuge
patent: 5818215 (1998-10-01), Miyamae et al.

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