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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 

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