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 | |  | | | | | Using X2Y® Multi-pin Capacitors When Designing Power Delivery Systems
Steve Weir
Consultant with Teraspeed® Consulting Group LLC and X2Y Attenuators, LLC | |
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Interview: Using X2Y Multi-pin Capacitors When Designing Power Delivery Systems
X2Y modeling capacitors are now supported by Allegro PCB PI option XL, release 15.7. Cadence interviewed Steve Weir to obtain his views on when the X2Y multi-pin capacitors should be used in the design of Power Delivery Systems.
CDN: What is the primary criteria for capacitors in Power Delivery System (PDS) design?
Steve: Numerous references including papers and presentations by well known industry experts all clearly explain that low mounted inductance is important for capacitors of all capacitance values. Inductance is mentioned no less than 36 times in Dr. Eric Bogatin's recent webinar "Best Board Design Practices for the Power Distribution Network (PDN)". A low inductance bypass capacitor network is a critical component of the total Power Distribution Network.
CDN: When do you recommend reducing mounted capacitor inductance with extra vias?
Steve: With X2Y capacitors this is not an issue. When using conventional two terminal capacitors improved mounted inductance must be traded off against the negative impacts of: reduced via utilization, greater blocked routes, and greater plane perforation.
CDN: How do you balance the trade-offs between component unit cost and total manufactured cost.
Steve: Sophisticated OEMs recognize that total manufactured cost directly impacts their bottom line. On the other hand, raw component unit, or even line item costs are elements that do not independently reflect on the bottom line. Placement costs, via drill costs, board area, layer count impacts, and assembly reliability are all impacted negatively by higher component counts. Cheap or even free components often come with very expensive price tags, while high quality components afford real savings time and again.
CDN: When should customers choose an X2Y capacitor versus a regular capacitor?
Steve: X2Y capacitors should be used wherever power distribution performance and/or cost are a significant concern.
CDN: Are there scenarios/situations where X2Y is not appropriate to use. Pointing that out would be valuable to the readers.
Steve: As with any component, if a particular required capacitance value is not available then another capacitor type is called for. There are also some very specific design circumstances where the physical mechanics lend themselves to other form factor components. In such circumstances we recommend appropriate solutions to our customers. Find out more at X2Y® Components Library and PDN Papers.
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X2Y modeling capacitors are now supported by Allegro PCB PI option XL, release 15.7. Cadence interviewed Steve Weir of X2Y to obtain his views on when the X2YR multi-pin capacitors should be used in the design of Power Delivery Systems. Find out more at X2Y® Components Library and PDN Papers.
About the author
Steve Weir is a Consultant with Teraspeed® Consulting Group LLC and X2Y Attenuators, LLC. Steve Weir has more than 20 years of experience in the Electronics Industry, holds 17 U.S. patents, and has architected a number of packet and TDM switching products. As a recognized expert on design strategies for Power Distribution Networks (PDN), Steve has participated as TecPanelist at multiple DesignCon Symposiums on the subjects of both bypass capacitor characterization and Power Integrity design methods for ICs. Steve is a frequent contributor to the Si-List, a message reflector dedicated to signal and power integrity. |
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