SPDT RF switch optimises broadband cable performance

20th August 2013

Nat Bowers

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Datasheet

Peregrine Semiconductor introduces a new 75-Ohm RF switch for broadband cable systems. The new PE42720 is a HaRP-enhanced single-pole, double-throw switch featuring high linearity, leading isolation performance and excellent video feedthrough. This feature combination is ideal for supporting higher data rates in cable modem termination systems, multi-service headends, cable television optical transceivers, fibre hubs, optical network terminals, and CATV amplifier modules.

Supporting increasing data rates as required by the industry transition to DOCSIS 3.1, the PE42720 is optimised for high linearity and isolation performance. This high linearity minimizes distortion in the cable network to support new modulation schemes such as 4096-QAM. The ability to support high isolation between RF ports minimizes unwanted signal interference. DOCSIS 3.1 relies on orthogonal frequency-division multiplexing to improve spectral efficiency, and this combination of features enables a 50% increase in data rates up to 10Gb/s downstream and 1Gb/s upstream.

Mark Schrepferman, director of the commercial and industrial product line with Peregrine’s High performance Solutions Business Unit, commented: “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. Peregrine has been supporting these requirements for years in the wireless markets, and we are pleased to bring the exceptional linearity and isolation performance that can only be achieved using Peregrine’s UltraCMOS technology and HaRP enhancements to broadband cable applications.”

The new PE42720 RF 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). 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).

Featuring excellent video feedthrough of 5mVpp for reduced distortion, the switch delivers low insertion loss (0.7 dB @ 1GHz and .8 dB @ 2 GHz). This enhances the 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.

Development tool support:

Peregrine have also announced that the PE42720 Evaluation Kit is available to order now.

Packaging, pricing and availability:

The PE42720 is available now in volume production, supplied in a 4x4 mm 20-lead LGA package priced at $1.06 in 10K quantity orders.