Peregrine Chip Eases D3.1 Transitions

The new switch IC can be used in cable CPE to make the products capable of supporting dual bands. This means MSOs won't have to replace CPE when they allocate more bandwidth to the upstream.

Brian Santo, Senior editor, Test & Measurement / Components, Light Reading

March 15, 2016

2 Min Read
Peregrine Chip Eases D3.1 Transitions

Peregrine Semiconductor Corp. has introduced a single RF switch for DOCSIS 3.1 customer premises equipment (CPE) that will enable MSOs to deploy a set-top, gateway or cable modem that will remain operable regardless of the upstream/downstream spectrum split an MSO upgrades to over time.

The switches also support both DOCSIS 3.0 and 3.1.

Having this part available means an MSO will not have to swap out CPE as it transitions from D3.0 to D3.1, and -- more importantly -- can keep the same unit in place if and when it decides to increase the amount of spectrum it dedicates to the upstream channel, Peregrine's ‎director of marketing, Kinana Hussain, explained to Light Reading.

Cable CPE to date commonly supports only one upstream/downstream band combination, integrating either a low-band filter or a high-band filter. Peregrine's existing PE42722 and its new PE42723 RF switches can be used instead to enable dual upstream/downstream bands to reside in the same product.

Want to know more about communications ICs? Check out our comms chips channel here on Light Reading.

The traditional cable spectrum split dedicates 5MHz to 42MHz for the return path. With the introduction of DOCSIS 3.1, operators can choose to increase their upstream bandwidth allocation from 5-85MHz (often referred to as the mid-split) or 5-204MHz (the high split), as they increase their total amount of spectrum up to 1.7GHz and possibly beyond.

The new PE42723 resides in a package that is 64% the size of its predecessor, and is made with the same silicon on insulator technology, which the company calls UltraCMOS. Hussain claims its UltraCMOS capabilities make Peregrine the only company with an RF switch that has the linearity characteristics that can support dual bands in a DOCSIS environment.

The new part matches the linearity characteristics of its larger predecessor. As the company designed the new IC, Hussain said, "We thought we might have worse performance, but it turned out actually no."

The switch is placed directly at the cable modem (CM) F-connector before the filters and must comply with D3.1 CM spurious emissions requirements of -50 dBmV, requiring the switch harmonic performance to be greater than -115 dBc.

Offered in 12-lead 3 x 3 mm QFN package, volume-production parts, samples and evaluation kits are available now. For 10K-quantity orders, each PE42723 switch is $1.56.

— Brian Santo, SeniorEditor, Components, T&M, LightReading

About the Author(s)

Brian Santo

Senior editor, Test & Measurement / Components, Light Reading

Santo joined Light Reading on September 14, 2015, with a mission to turn the test & measurement and components sectors upside down and then see what falls out, photograph the debris and then write about it in a manner befitting his vast experience. That experience includes more than nine years at video and broadband industry publication CED, where he was editor-in-chief until May 2015. He previously worked as an analyst at SNL Kagan, as Technology Editor of Cable World and held various editorial roles at Electronic Engineering Times, IEEE Spectrum and Electronic News. Santo has also made and sold bedroom furniture, which is not directly relevant to his role at Light Reading but which has already earned him the nickname 'Cribmaster.'

Subscribe and receive the latest news from the industry.
Join 62,000+ members. Yes it's completely free.

You May Also Like