With increasing demand on very fast download speeds for movies, videos, photos and other content over existing cable connections, cable providers have evolved the Data Over Cable Service Interface Specification (DOCSIS) standard over decades from version 1 to 4 in order to achieve high data rates of 10 Gbps downstream and 6 Gbps upstream, and to compete with fiber technology.
It is expected that the next major broadband update, DOCSIS 4, will be able to use at least 3 GHz of RF spectrum available on existing coaxial cable for high-speed internet, a dramatically higher upload speed increase than 1.8 GHz currently needed to support DOCSIS 3.1 FD. DOCSIS 4 will enable multi-gigabit symmetrical services while staying compatible with DOCSIS 3.1. DOCSIS 4 will also require higher order quadrature amplification modulation (QAM) schemes up to 256-QAM for downstream and 16-QAM for upstream. For these reasons, linearity RF components that can meet higher downstream modulation error ratios (MER) are essential.
pSemi offers RF switches for cable modems, set-top boxes and residential gateway features with unmatched linearity performance, such as IIP3 and harmonics, enabled by UltraCMOS® technology along with excellent isolation, low insertion loss, low spurious emissions, and a CMOS/TTL-compatible control address the needs of wired broadband applications.
pSemi products for cable broadband include: