Detector power linearity requirements and verification technique

Details Detector power linearity requirements and verification technique Detector power linearity requirements and verification technique

1994-12-05

1997-07-01

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324623, 324633, G01R 2320

Patent

active

056442432

ABSTRACT:
A system (36, 98) for determining the linearity of an RF detector (46, 106). A first technique involves combining two RF signals from two stable local oscillators (38, 40) to form a modulated RF signal having a beat frequency, and applying the modulated RF signal to a detector (46) being tested. The output of the detector (46) is applied to a low frequency spectrum analyzer (48) such that a relationship between the power levels of the first and second harmonics generated by the detector (46) of the beat frequency of the modulated RF signal are measured by the spectrum analyzer (48) to determine the linearity of the detector (46). In a second technique, an RF signal from a local oscillator (100) is applied to a detector (106) being tested through a first attenuator (102) and a second attenuator (104). The output voltage of the detector (106) is measured when the first attenuator (102) is set to a particular attenuation value and the second attenuator (104) is switched between first and second attenuation values. Further, the output voltage of the detector (106) is measured when the first attenuator (102) is set to another attenuation value, and the second attenuator (104) is again switched between the first and second attenuation values. A relationship between the voltage outputs determines the linearity of the detector (106).

REFERENCES:
patent: 3619774 (1971-11-01), Landwehr
patent: 3663954 (1972-05-01), Alker
patent: 3711769 (1973-01-01), Peake
patent: 4246535 (1981-01-01), Huang et al.
V. S. Reinhardt, et al. Methods for Measuring the Power Linearity of Microwave Detectors for Radiometric Applications, (month unavailable) To be published in the 1994 IEEE MTT-S Symposium Digest.

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