Meaning
Spectrum analyzer traces define spectral boundary lines that establish minimum acceptable noise performance for receiver and transmitter testing. A noise floor mask acts as a graphical or numerical threshold across a specified frequency range to detect unwanted spur emissions and thermal noise elevation. Automated test routines compare measured power spectral density against the mask to determine whether device performance meets system design requirements.
The boundary applies to receiver front end sensitivity and transmitter out of band noise limits.
Spectral Limit
Automated measurement software overlays limit lines onto RF spectrum traces to automate pass or fail determinations during production testing. Defining a noise floor mask ensures that phase noise and spurious signals remain below acceptable interference thresholds across all operating channels.
Receiver Sensitivity
Dynamic range evaluation requires receiver circuits to detect weak signals above thermal background noise. Evaluating a receiver front end against a noise floor mask identifies internal switching noise and clock harmonics that degrade weak signal reception.
Measurement Boundary
RF test fixtures contribute thermal noise that can distort low level measurement results if uncalibrated. Calibration routines adjust the noise floor mask to account for cable losses and instrument noise figures prior to running device verification routines.
