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For layout purposes, it is critical to specify whether the analog and digital grounds should be considered one ground signal (i.e. In the example schematic, both an analog and a digital ground are used. Once satisfied with the schematic (and functionality or performance through the use of simulation), it is time to prepare the schematic for transfer to the PCB layout environment. Since these are net connections only and do not connect to a footprint for layout purposes, it is appropriate to have them appear in a black color. Notice here that power and ground symbols are considered virtual parts that connect into a single net, and these symbols are treated specially in the schematic environment. Figure 1 is a Multisim SPICE simulation schematic that helps illustrate the basic steps from schematic to final PCB generation:įigure 1: A Multisim SPICE simulation schematic. All of the components selected in the schematic must have correctly assigned packages associated with them so that the generated part list and netlist representing required connections will be correct. The first step in successfully creating a PCB is the proper creation of an appropriate schematic drawing of the circuit. Schematic drawing and footprint selection This article outlines an example design flow. In this part, we discuss schematic drawing and footprint selection as well as transferring the design to layout. Part one of this article, PCB Design Basics, outlines the major terminology in PCB design. The articles are written in the context of the National Instruments circuit design tools NI Multisim and NI Ultiboard.
#Altium pcb design example series#
This series of articles discusses the different steps of PCB development from the basics of creating a design schematic with specific requirements, to finalizing a board and preparing it for fabrication.