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RF switch complies with DOCSIS 3.1 standard

Posted: 16 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Peregrine Semiconductor? RF switch? DOCSIS? customer premises equipment? CPE?

Peregrine Semiconductor Corp. introduced a high-linearity RF switch that allows a dual upstream/downstream band architecture in cable customer premises equipment (CPE) devices. By using a dual-band architecture, the UltraCMOS PE42722 gives multi-service operators (MSOs) the option to provide their customers additional services while CPEs can comply with the latest DOCSIS 3.1 cable industry standard.

CPE devices, such as STBs, cable modems and home gateways, have previously supported only one upstream and downstream band at a time. Until now, no switch has met the linearity requirements necessary to support a dual-band architecture. When upgrading to a different high-speed service plan, the customer is faced with the inconvenience of physically changing the CPE device to get the hardware necessary to support the higher upstream and downstream band requirements. The introduction of the PE42722 high-linearity switch marks the first time that dual upstream/downstream bands can reside in the same CPE device, according to the company. Once CPE devices are equipped with the PE42722 switch, the exchanging of hardware will no longer be necessary.

UltraCMOS PE42722

An additional benefit of the PE42722 high-linearity switch is its compliance with the DOCSIS 3.0 and 3.1 cable standards. The DOCSIS 3.1 standard was introduced in October 2013 in order to meet the customers' demand for more high-speed home data, but its requirements put enormous pressure on the entire cable industry ecosystem, from CPE devices to the infrastructure. To ease the infrastructure transition to the higher speeds and eliminate the need to replace the CPE, these devices must incorporate the flexibility to accommodate multiple upstream/downstream frequency band definitions. To create a dual-band architecture, a switch must be placed directly at the cable modem (CM) connector before the filters and needs to comply with the stringent DOCSIS 3.1 CM spurious emissions requirements of -50dBmV. Such a low spurious level requires the switch harmonic performance to be better than -115dBc.

Covering a frequency range of 5-1794MHz, the PE42722 readily supports an average input power greater than 65dBmV. The switch's low insertion loss (0.3dB at 1218MHz) preserves noise figure and receiver sensitivity and achieves superior signal quality, along with providing high isolation of 40dB at 612MHz, detailed Peregrine. The PE42722 also features a low current consumption of 130uA, standard 1.8V and 3.3V logic support, a voltage supply range from 2.3-5.5V, and 1.5kV ESD protection on all pins.

Offered in a 32-lead 5mm x 5mm QFN package, volume-production parts, samples and evaluation kits are available. Each PE42722 switch is priced at $3.38 each for 10K-quantity orders.

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