How an RF product is scaled into volume and kept in good order: yield and RF parametric monitoring across sites and lots, field returns, changes to wafers, substrates, filters, assembly and software through change notification, and keeping certifications valid as the product and the rules change. Product engineers, operations managers and quality and compliance engineers use it.

1. Purpose and scope

After release, the product's performance has to hold in volume. RF parameters depend on many inputs: wafer lots, substrate batches, filter revisions, assembly sites and test hardware. Small shifts in any of them can move gain, power or emissions, and a shift that stays inside test limits can still erode margin to a regulatory limit or a customer's own budget. Sustaining keeps watch over these distributions and acts before they become returns.

Changes are a constant of sustaining: a second source for a filter, a new assembly site, a die shrink, a firmware update. Each one is assessed for RF performance, reliability and test, and in radio products also for certification, because a certified module's approvals cover a specific configuration. The stage runs from the volume ramp through periodic sustaining and change reviews until the product moves to end of life.

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