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RF switch improves broadband cable systems

Posted: 22 Aug 2013 ?? ?Print Version ?Bookmark and Share

Keywords:RF switch? DOCSIS 3.1? UltraCMOS? CATV? CMTS?

Peregrine Semiconductor Corp. has released the 75 RF switch for broadband cable systems. Manufactured on the company's UltraCMOS technology, the HaRP-enhanced single-pole, double-throw (SPDT) PE42720 switch features high linearity, leading isolation performance and excellent video feedthrough geared for supporting higher data rates in cable modem termination systems (CMTS), multi-service headends, cable television (CATV) optical transceivers, fibre hubs, optical network terminals and CATV amplifier modules, detailed the firm.

The PE42720 supports increasing data rates as required by the industry transition to DOCSIS 3.1. High linearity minimises distortion in the cable network to support new modulation schemes such as 4096-QAM, while the ability to support high isolation between RF ports minimises unwanted signal interference. This combination is critical as DOCSIS 3.1 relies on orthogonal frequency-division multiplexing (OFDM) to improve spectral efficiency, allowing a 50 per cent increase in data rates up to 10Gb/s downstream and 1Gb/s upstream.

The switch features high isolation performance of at least 60dB across the entire broadband frequency range of 5MHz to 3GHz (65dB at 1GHz (typ) and 64dB at 2GHz). The device claims to feature excellent video feedthrough of 5mVpp for reduced distortion, and delivers low insertion loss (0.7dB at 1GHz and 0.8dB at 2GHz), which enhances overall system performance by reducing RF path noise figure. In addition, high linearity with a CTB/CSO of -104dBc improves dynamic range of CATV systems. The PE42720 supports 1.8V and 3.3V control logic and ESD performance of 2500V HBM on all ports.

Peregrine Semiconductor also announced availability of the PE42720 Evaluation Kit. The PE42720 is available in volume production, supplied in a 4 x 4mm 20-lead LGA package priced at $1.06 in 10K quantity orders. Samples and volume-production quantities can be ordered today.

Datasheet for the PE42720 can be downloaded here.





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