Measurement of Transmitter Noise at High Frequency through Microwave Frequencies.
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL ALA ADVANCED SENSORS DIRECTORATE
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A tutorial review of the basis for transmitter noise measurements shows that noise is best described and measured as AM and FM noise. The contribution of AM noise to RF spectrum shape is determined by the power spectral density shape of the AM noise. The contribution of FM noise to the RF spectrum is to make the shape that of an RLC resonant circuit response rather than a delta function with a sideband structure. AM noise is measured with a direct detector diode. FM noise for frequencies above 5 GHz is measured with a discriminator based on a one-port cavity. FM noise below 15 GHz is measured with an improved transmission line discriminator which is described in detail. The most widely used baseband analyzer is the constant bandwidth superheterodyne wave or spectrum analyzer. The baseband spectrum analyzer has been automated. Complete calculator programs with brief descriptions are presented in the Appendix. Author
- Test Facilities, Equipment and Methods