Method and apparatus for setting the signal-to-noise ratio of a

Details Method and apparatus for setting the signal-to-noise ratio of a Method and apparatus for setting the signal-to-noise ratio of a

1987-09-29

1989-06-06

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2728

Patent

active

048374989

ABSTRACT:
A signal source which provides a carrier signal having a precisely set signal-to-noise ratio is provided. The carrier signal and its sideband noise components are attenuated below the equivalent thermal noise floor of an attenuator. The attenuated carrier signal and the equivalent thermal noise floor are then amplified in an amplifier having a known noise figure to produce a composite carrier signal having a usable power level and a precisely known signal-to-noise ratio. Since the equivalent thermal noise floor is a function only of temperature, the desired carrier signal-to-noise ratio may be set by setting the power level of the carrier signal and knowing the noise figure of the amplifier.

REFERENCES:
patent: 2773186 (1956-12-01), Herrmann, Jr.
patent: 3683282 (1972-08-01), D'Amato et al.
patent: 4742561 (1988-05-01), Tipton

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