Why choose Newbury Innovation to help with your PCB CAD layout?
- You will have an experienced CAD engineer exclusively dedicated to your project.
- We will quote a fixed price and delivery time.
- We have the experience (30 years and 1000’s of CAD layouts) to create a properly engineered PCB CAD layout including full consideration of design for manufacture.
- We have a vast practical knowledge of components and footprints.
- We can incorporate mechanical design including displays, keypads and enclosures.
At the Newbury Group, comprehensive electronic design advice is available from within our team. This may be an additional cost depending on the scope.
We design layouts using market-leading design packages such as Altium and Easy-PC. ORCAD compatible netlists are directly readable. We provide project files on request, to allow you to modify the designs for yourself if you wish.
Optionally, we can fabricate sample PCBs for you and assemble them. These services are in-house.
How do we proceed with your CAD layout?
From customer sketches, we produce a Project File. This file contains the schematic layout incorporating component data derived from our libraries. Each component symbol will have a description of that component, a supplier, stock code and a special notes column. At the press of a button, an Excel parts list is created listing every component within the design.
Due consideration is given to client’s requirements for cost, mechanical design, overall size, external connections, etc, all of which will influence the number of layers, the copper weights, track widths, and PCB thickness.
Once the schematic layout is approved, we create the PCB tracking layers accordingly. The benefit of producing a new design in this way is that the total makeup of the project is contained within an integrated and intelligent dataset. Any changes or modifications flow through the dataset maintaining the integrity of every part of the design database.
It is not always necessary to create a schematic if the design is relatively simple. It is possible using parts lists and schematics supplied by customers to go straight to the layout of PCB tracking.
Components placed from our library are connected as shown in the schematic diagram by suitable tracking. When the layout is complete a net list is generated for sign off.
This is an area where requirements have become more demanding over the past few years.
Impedance control for differential and single end data lines, mostly in the regions of 50 or 75 ohms need more consideration for track widths and spacings, and where they are placed, be it on external or internal layers.
We use state of the art software to calculate these factors ensuring that correct impedances are achieved. These can be verified by the provision of suitably designed test coupons which are measured on a calibrated impedance testing machine.
We have wide experience of design and manufacture of flexible circuits, where due consideration must be made for both the working environment, whether one time or dynamic flex, and for design for manufacture, to ensure the flex circuit is incorporated into a rigid carrier pallet.
Although flexible circuits have been around for a long time, they are still not widely used. Nevertheless, they can be very useful for connecting rigid PCB’s within stacks. For example, interlinking from perhaps a main microprocessor to a moving head interface board.
Layout considerations are quite different from those of rigid PCBs. Careful thought is required for coverlays to ensure the solder point widows are correctly aligned. They may also need rigid areas at specific points to create flatness for placement of SMD components. These can be made up of additional layers of rigid polyimide or FR4 material. Sharp internal corners and tight bend radii must be avoided.