Spectrum Analyzers Redefined

摘要

Spectrum analyzers are changing to accommodate the requirements of modern communications systems. RF envelope amplitude scaled to read Vrms, long the standard format of a spectrum analyzer's measurement results, is being augmented by direct power measurement. Vector signal analysis is adding in-phase/quadrature (IQ) demodulation to the usual AM and FM capabilities. New types of spectrum analyzers also have been developed. Some provide realtime signal acquisition, capturing all relevant information about the signal as it varies in time. Others address terahertz dense wavelength division multiplexed (DWDM) systems that modulate multiple wavelengths of light in a single fiber-optic cable.