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Keysight Technologies
Understanding the SystemVue
To ADS Simulation Bridge
Application Note
Introduction
The Keysight Technologies, Inc. SystemVue is a new system-level design environment that enables a
top-down, model-based design methodology for both communication physical layer (PHY) systems
and aerospace/defense systems.
This application note examines the link from SystemVue directly into an RF hardware design low that
allows mutual system-RF co-veriication. At a practical level, this is achieved by adding special I/O
blocks that connect datalow simulators in both SystemVue 2010.01 and Keysight Advanced Design
System (ADS) 2009 Update 1. This connection allows a complex-valued, sampled I/Q datastream from
SystemVue to low to ADS where it can be processed with the Circuit Envelope or Transient/Convolution
circuit simulator and then return to SystemVue for coded receiver and demodulation (Figure 1).
Coded baseband Closed-loop feedback for Coded baseband
reference IP BER, HARQ, throughput reference IP
Source SystemVue SystemVue Receiver
I/O I/O
ADS RF/IF ADS
I/O Designs I/O
RF nonlinear physical
design with layout/EM
Figure 1. SystemVue can drive ADS in a live co-simulation to achieve higher system-level
accuracy and enable more predictive collaboration.
Beneits for both baseband/DSP and RF designers
This completed round trip allows system-level architects and baseband algorithm developers to
beneit from the increased accuracy for analog-domain components and RF "work-in-progress."
Typically, these users of math, C++, and HDL language modelling do not have access to high-
accuracy, envelope-domain physical models. Instead, they do their development in isolation with
inferior RF equivalents.
RF circuit designers also derive a beneit from the completed round trip. Their early RF designs can be
seen operating in a working system with early baseband DSP processing wrapped around them, using
realistic waveforms. While ADS users are accustomed to co-verifying baseband designs with their RF
circuits, in most situations, the baseband DSP has already been completed. Consequently, there is
no real opportunity to change the DSP, only to verify the RF. RF design groups can now access earlier
baseband investigations (in the math or C++ stages), before they are committed to implementation
and while there is still time to re-partition the system design between either the baseband or RF
paths--the best place to solve a problem, if one should occur.
In essence, SystemVue allows cross-domain debugging (down to the math or C++ algorithms) in order
to track and solve architectural issues that were previously dificult to do across toolsets.
03 | Keysight | Understanding the SystemVue To ADS Simulation Bridge