HP 5091-7196E free download

File name 5091-7196E.pdf

Agilent PN 89400-3 CDMA Measurements with the 89400 Series Vector Signal Analyzers Product Note Measurement challenges in CDMA interest. Power in adjacent channels In the precision RF front-end of Code division multiple access (CDMA) makes it impossible to use power or the Agilent Technologies 89400 communications systems combine peak-power meters without external Series VSAs, a block downconverter digital modulation and spectrum- filtering. You need an analyzer that tunes to a 7-MHz span anywhere spreading encoding techniques to makes combined time- and frequency- within a 2.65-GHz range for the create broadband signals which are selective measurements. 89441 and 1.8-GHz range for the immune to noise, and which them- 89440A. The down-converted sig- selves look like noise. Their natural Other measurements of interest to nal is filtered and digitized by a noise immunity allows multiple CDMA system designers include digital high-speed, high-resolution A to D CDMA signals to overlay each other modulation analysis, filter frequency converter. Subsequent digital mix- in a common band. Measurements of response, amplifier intermodulation ers and filters allow the span to CDMA signals present new challenges and compression, identification and be narrowed to as little as 1 Hz at to test instruments. quantification of AM or PM spurious arbitrary center frequency. High- sidebands, and phase noise character- performance processors provide In the world of CDMA, a key measure- ization. These common measurements fast spectrum, time domain, and ment is the power spectrum