HP 5966-4008E free download

File name 5966-4008E.pdf

Agilent Spectrum and Signal Analyzer Measurements and Noise Application Note Measuring Noise and Noise-like Digital Communications Signals with Spectrum and Signal Analyzers Table of Contents Part I: Noise Measurements ... 3 Introduction... 3 Simple noise--Baseband, Real, Gaussian ... 3 Bandpassed noise--I and Q ... 3 Measuring the power of noise with an envelope detector ... 6 Logarithmic processing... 7 Measuring the power of noise with a log-envelope scale ... 8 Equivalent noise bandwidth ... 8 The noise marker ... 9 Spectrum analyzers and envelope detectors ... 10 Cautions when measuring noise with spectrum and signal analyzers... 12 Part II: Measurements of Noise-like Signals ... 14 The noise-like nature of digital signals ... 14 Channel-power measurements... 14 Adjacent-Channel Power (ACP)...