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New Design Considerations
Open New Design Considerations Document
Topics in this guide include:
User Interface Issues
Design Environment Colors: Set up the AWRDE with your preferred schematic, system diagram, and layout colors.
Simulation Issues
Project Units: Determine your project units strategy-- either setting unit modifiers or only using base units. Project units are problematic when using equations if you change your project units, or if you export a schematic from one project and import it into a project with different units.
Dependent Parameters: Standardize the units to Base Units prior to exporting to ensure that a consistent set of schematic parameter values are used for group design projects.
Test Benches: A hierarchical approach to simulation that requires creation of a single schematic with all circuit elements, except sources. After this step, a test bench is created with the appropriate sources, using a copy of the original schematic for specific measurements. The advantage of this approach is that the original schematic is not altered in any way.
Multi-processor Configuration: Take advantage of multiple processors in a machine for electromagnetic and harmonic balance simulations.
X-Models: X-models, or EM-based models, are used for distributed elements when the highest degree of accuracy in representing a discontinuity, such as a bend or tee, is desired. When properly used, X-models offer the accuracy of EM simulation with the speed of linear simulation.
Layout Issues
Database Resolution: A sensible database resolution unit is important when setting up a process. This step is automated for designers using Process Development Kits (PDKs). A database unit is defined as the smallest unit of precision for a layout.
Flow Considerations: Working through a planned design flow is recommended before beginning an actual design, to eliminate potential problems late in the cycle. The manufacturing flow, layer configuration, artwork import, and design export must all be considered before starting the design.
Snapping Mode: Snapping functions connect the faces of layout cells in different ways. You can set snapping options in the Layout Options dialog box. AWR recommends using manual snapping rather than automatic snapping for complex layouts.
Inset Faces: In PCB, MIC, or MMIC designs, connections between cells are made on faces rather than pins. Gaps can be created in layout as a result of rotating cells if layout options are not fully understood.
Export Options: It is important to understand Layout Options if you plan to export your layout. You do not need to select these options at the beginning of a project, however, you should consider them prior to tape-out.
GDSII Cell Options: It is important to understand the implications of selecting the various Cell Library properties settings.
Physical Considerations: If you plan to perform Layout Versus Schematic (LVS) analysis on MWO projects, you should be aware that an LVS engine may not understand all portions of your design, such as EM structures or Touchstone® data files.
Library Issues
Component Libraries: Decide on a vendor library management approach.
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