For measuring suppression of the power radiated in adjacent channels with W-CDMA (wideband code division multiple access) signals, instruments must have sufficient margin relative to the tolerance limits laid down in specifications. This requirement becomes even more stringent for a spectrum analyzer used to measure the ACPR (adjacent-channel power ratio) on modules and components in the transmission path of W-CDMA base stations. Spectrum Analyzer FSE with its wide dynamic range is the ideal choice for this application. The attainable ACPR value is limited by the inherent noise floor of the spectrum analyzer and the increase of nonlinear distortion products. For this reason the level at the mixer has to be set very carefully. Use of RF Attenuator RSG...
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