Spectrum analyzer and logarithmic amplifier therefor

Details Spectrum analyzer and logarithmic amplifier therefor Spectrum analyzer and logarithmic amplifier therefor

1987-10-07

1989-03-14

Laroche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307492, G06G 724

Patent

active

048127728

ABSTRACT:
The spectrum analyzer comprises an input for receiving eletromagnetic signals in a predetermined first frequency band and an image reject mixer for reducing the power of images of the received signals while down-converting the signals to an intermediate frequency. The image reject mixer reduces the signal power level to approximately that of the background noise of the signal. The mixer is swept through a predetermined frequency band in order to down-convert each frequency in the received signal band individually. The down-converted signals are logarithmically compressed using a multi-stage logarithmic compression circuit having variable gain amplifiers in each stage.

REFERENCES:
patent: Re30781 (1981-10-01), Miyamoto
patent: 3062789 (1962-10-01), Mace
patent: 4209714 (1980-06-01), Miyamoto

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