New RF switch optimises performance of broadband cable systems

Peregrine Semiconductor, a fabless provider of radio frequency integrated circuits (RFICs), is making available the PE42720 75-Ohm RF switch for broadband cable systems. Manufactured on Peregrine’s UltraCMOS technology, the HaRP-enhanced single-pole, double-throw (SPDT) switch features high linearity, leading isolation performance and excellent video feedthrough making it suitable for supporting higher data rates in cable modem termination systems (CMTS), multi-service headends, cable television (CATV) optical transceivers, fiber hubs, optical network terminals, and CATV amplifier modules.

Optimised for high linearity and isolation performance, the PE42720 supports increasing data rates as required by the industry transition to DOCSIS 3.1. High linearity reduces 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% increase in data rates up to 10Gb/s downstream and 1Gb/s upstream.

“As the cable television market moves to OFDM to increase data rates, manufacturers will need to make improvements in efficiency in all parts of the system by reducing noise, intermodulation distortions, and ingress,” said Mark Schrepferman, director of the commercial and industrial product line with Peregrine’s High performance Solutions Business Unit.

Peregrine’s new switch features high isolation performance of at least 60dB across the entire broadband frequency range of 5MHz to 3 GHz (65dB at 1 GHz (typ) and 64dB at 2GHz). The device features excellent video feedthrough of 5mVpp for reduced distortion, and delivers low insertion loss (0.7 dB @ 1GHz and .8 dB @ 2 GHz), which enhances overall system performance by reducing RF path noise figure. In addition, high linearity with a CTB/CSO of -104 dBc 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.

www.psemi.com

 

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