[[RF.Spice A/D]] is an extensive superset of [[B2.Spice A/D]], offering additional RF simulation capability plus a comprehensive library of system-level black-box virtual blocks. Due to popular demand, EMAG Technologies Inc. continues to offer [[B2.Spice A/D]] simply as the '''"Lite Version"''' of the [[RF.Spice A/D]] product. The [[User Interface|user interface]] of the two products are now identical and both share the same consolidated online documentation and tutorial lessons. However, the users of the [[B2.Spice A/D]] edition will find the following submenus of the '''Parts Menu''' greyed out and inaccessible:
* [[RF.Spice A/D]] Workshop > Parts Menu > [[Multiport Networks]]* [[RF.Spice A/D]] Workshop > Parts Menu > [[Transmission Lines]]* [[RF.Spice A/D]] Workshop > Parts Menu > RF Devices* [[RF.Spice A/D]] Workshop > Parts Menu > Waveform Generation Blocks* [[RF.Spice A/D]] Workshop > Parts Menu > Analog Signal Processing Blocks* [[RF.Spice A/D]] Workshop > Parts Menu > Digital Signal Processing Blocks* [[RF.Spice A/D]] Workshop > Parts Menu > Spectral Processing Blocks* [[RF.Spice A/D]] Workshop > Parts Menu > Modulation Blocks * [[RF.Spice A/D]] Device Manager > Tools Menu > Transmission Line calculators * [[RF.Spice A/D]] Device Manager > Tools Menu > Transmission Line Designers
In addition, all the transmission line calculator and transmission line designer utilities under the Device Manager's '''Tools Menu''' are greyed out, and so are the RF device creation and model import and creation items in the Device Manager's '''File Menu'''are greyed out. Needless to say, the parts database of the [[B2.Spice A/D]] edition is a reduced subset of the parts database of [[RF.Spice A/D]].
== The Stages of a Circuit/System Simulation ==