Free Trials

Download a free trial to find out which Altium software best suits your needs

How to Buy

Contact your local sales office to get started on improving your design environment


Download the latest in PCB design and EDA software

  • Altium Designer

    Complete Environment for Schematic + Layout

  • CircuitStudio

    Entry Level, Professional PCB Design Tool

  • CircuitMaker

    Community Based PCB Design Tool


    Agile PCB Design For Teams

  • Altium 365

    Connecting PCB Design to the Manufacturing Floor

  • Altium Concord Pro

    Complete Solution for Library Management

  • Octopart

    Extensive, Easy-to-Use Component Database

  • PDN Analyzer

    Natural and Effortless Power Distribution Network Analysis

  • See All Extensions

    World-Renowned Technology for Embedded Systems Development

  • Live Courses

    Learn best practices with instructional training available worldwide

  • On-Demand Courses

    Gain comprehensive knowledge without leaving your home or office

  • Altium 365 Viewer

    View & Share electronic designs in your browser

  • Altium Designer 20

    The most powerful, modern and easy-to-use PCB design tool for professional use


    Annual PCB Design Summit

    • Forum

      Where Altium users and enthusiasts can interact with each other

    • Blog

      Our blog about things that interest us and hopefully you too

    • Ideas

      Submit ideas and vote for new features you want in Altium tools

    • Bug Crunch

      Help make the software better by submitting bugs and voting on what's important

    • Wall

      A stream of events on AltiumLive you follow by participating in or subscribing to

    • Beta Program

      Information about participating in our Beta program and getting early access to Altium tools

    All Resources

    Explore the latest content from blog posts to social media and technical white papers gathered together for your convenience


    Take a look at what download options are available to best suit your needs

    How to Buy

    Contact your local sales office to get started improving your design environment

    • Documentation

      The documentation area is where you can find extensive, versioned information about our software online, for free.

    • Training & Events

      View the schedule and register for training events all around the world and online

    • Design Content

      Browse our vast library of free design content including components, templates and reference designs

    • Webinars

      Attend a live webinar online or get instant access to our on demand series of webinars

    • Support

      Get your questions answered with our variety of direct support and self-service options

    • Technical Papers

      Stay up to date with the latest technology and industry trends with our complete collection of technical white papers.

    • Video Library

      Quick and to-the-point video tutorials to get you started with Altium Designer

    How to Use a Modular Approach to Simplify Your PCB Design Process

    Altium Designer
    |  March 10, 2017
    Getting started with PCB design can feel as daunting as climbing a mountain

    Modular PCB design can end up taking more time if it is not planned out properly when moving from conceptual spec to actual design. There are a lot of factors to consider at once. For example, where to place major components to optimize space and performance, and which one to drop first. You’ll also need to consider where subsystems fit and which placement will result in the cleanest traces. These initial decisions can be daunting and lead to either procrastination or having to completely start over. Read on to find a solution for this!


    Image source: Adobe Stock User alexbrylovhk

    On my first trip to the Yosemite, I bit off more than I could chew. Big mountains, bad planning, and I found myself at the mercy of a squeeze chimney. One emergency bivvy later, my project had to be scrapped and I was back in the valley staring up at the mountain I couldn’t conquer. Modular PCB design can end up like my failed climbing endeavor if it is not planned out properly when moving from conceptual spec to actual design.  There are a lot of factors to consider at once. For example, where to place major components and which one to drop first. You’ll also need to consider where subsystems fit and which placement will result in the cleanest traces. These initial decisions can be daunting and lead to either procrastination or, in my case in Yosemite, having to completely start over.

    To help break through ’s block I simplify the design concepts by modularizing them into virtual components.


    Image source: Flickr User Uwe Hermann (CC BY 2.0)

    Break the Mountain Down into Steps

    Much like how a climber would approach a mountain; break your Printed Board design into manageable “pitches” and tackle each one individually until you’ve reached the top. To get your design started, find areas in the design that are self-contained or have a well-understood interface. These sections will eventually need to be designed in detail, but in the beginning, we only need to identify their presence on the board. Once they have been identified, you can temporarily block them off using a placeholder, which we will refer to as a “black box”.  Much like planning a climbing route, this will let you focus on the big picture and then you can go back and tackle each individual section. Using placeholders in your design to prioritize sections of your layout is commonly referred to as “modularizing your design”.

    If you think about it, many of the actual components we use in our designs are black boxes for two reasons:

    1. They present a well-defined interface in their pinouts and specs.

    2. We know that their performance is predefined and specific to their interface. As a result, we do not need to define how they function in their interface.  

    Imagine how complicated your project would become if you had to represent the internal workings of all op-amps, CPU’s, regulators, etc. It would be enormously complex.  

    We can expand upon this concept of placeholders to kick start the design process.  Often you’ll have a jumping off point for figuring out how to break down your design into manageable pitches if you stay organized. Remember your project documentation? Those flow charts, design overviews, and user documentation should present the function of your design at a high level. Like your modular PCB layout, these documents focus on the big picture of your design and are an excellent resource for initially modularizing your PCB layout.

    Regardless of whether you have these documents or not, I recommend repeating the following steps until the design concept is simple enough to complete:

    • Find a subsystem or functional group you can modularize

    • Identify all the components that are part of the group

    • Identify the inputs and outputs (i.e. the interface) of the group

    • Create a black box to represent the group and its interface

    • Substitute the black box for the identified components in your design

    Once you have defined your modules, take a first pass at your schematic or PCB using black boxes just to get an idea of how they interrelate.  It will be straightforward to build out the whole design. With that done, you can begin designing the contents of the individual black boxes. You may choose to modularize the subsystems within them as well. Modularization works at any level.


    Image source: Flickr User Steve Marple (CC BY 2.0)

    Modularization Tools and Techniques

    Most design software will include features that help you modularize your design. This allows you to represent your modules in the project environment in whatever way makes the most sense to you and your team. Here are a few ideas that are commonly available:

    Drawing Tools

    Use the drawing tools to place shapes on your board.  This can be a simple box or something more creative--whatever helps you stay organized. You can also use the line drawing tool to show connections to other of the design.

    Custom Components

    Some design software lets you define custom components in case you don’t find everything you need in their component libraries. You may even be able to define the electrical properties of the component accurately enough to include it in a working schematic.


    Use text to represent your black box, or add written text to a drawn shape. It may also be helpful to annotate why you made this placement and to define the black box's intended function. Be sure to point to the part of the design the note applies to with an arrow.


    Create reminders for yourself to design the contents of your black boxes using "to-dos". To-do items should be available to you anywhere in a project. They can be assigned to an owner, categorized, and marked as complete when they are done.

    Clean Up With Ease

    Since my first experience in Yosemite, better route planning has led to significantly less discomfort. The same goes for modularizing your PCB design software and, lucky you, there are even programs to help you out with this. Altium Designer® can help modularize your design, and track and report on your progress. This way you can spend less time anxiously plotting how to get out of a bad situation and more time designing an excellent product.  

    About Author

    About Author

    PCB Design Tools for Electronics Design and DFM. Information for EDA Leaders.

    most recent articles

    Back to Home