Magnetostatic wave delay line discriminator with automatic quadr

Details Magnetostatic wave delay line discriminator with automatic quadr Magnetostatic wave delay line discriminator with automatic quadr

1985-06-25

1988-10-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 83Q, 333201, 328133, G01R 2500, H03D 1300

Patent

active

047806672

ABSTRACT:
A discriminator having a power divider that divides a signal under test into a signal channel component and a reference channel component. A tunable delay line, such as a magnetostatic wave delay line, inserts a delay into the reference channel. A multielement input transducer selects a narrow band of spin wave wavelengths that are activated, thereby producing frequency discrimination. A phase detector is responsive to both channels to produce an output signal to a spectrum analyzer. A feedback loop, responsive to the output signal of the phase detector automatically places these two components into a quadrature relationship. The discriminator is automatically calibrated by tuning the delay line to values away from the quadrature condition in order to determine the discriminator consant.

REFERENCES:
patent: 4002969 (1977-01-01), Barley et al.
patent: 4002970 (1977-01-01), Ashley et al.
patent: 4002971 (1977-01-01), Rast, Jr. et al.
patent: 4451782 (1984-05-01), Ashida
patent: 4533873 (1985-08-01), Alcock
Owens; "Two Port Magnetostatic Wave Resonator . . . " IEEE MW Symposium-Jun. 1978.
Labaar; "New Discriminator Boosts Phase Noise Testing", Microwaves-Mar. 1982.

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