Highest-isolation, carrier-grade Wi-Fi switch in CMOS technology

September 25, 2013 // By Graham Prophet
An RF switch delivers a claimed 50 times more isolation and 10 times better linearity for 802.11ac Wi-Fi access points

Peregrine Semiconductor has announced a high-performance, carrier-grade Wi-Fi switch with the highest-available isolation – by a factor of 50. Peregrine’s switch also sets a new bar in linearity, which suits it for the fast-growing market of 802.11ac Wi-Fi access points.

Most Wi-Fi access points now contain multiple radios in order to address the capacity demands of cellular data. Based on Peregrine’s UltraCMOS technology, the PE42423 is the first in its class to offer 41 dB of port-to-port isolation at 6 GHz. This best-in-class isolation enables multi-radio access points to perform at peak levels without interference between the radios. Exceeding the stringent 802.11ac standard, Peregrine’s switch also offers 65 dBm of linearity to achieve higher data rates. In addition, UltraCMOS technology delivers equally high performance at either 3.3V or 5V, unlike gallium arsenide (GaAs) switches that experience severe performance degradation below 5V. Peregrine’s switch gives networking-product designers the flexibility to operate at lower power supplies and reduce energy consumption.

The PE42423 is a Single-Pole Double Throw (SPDT) RF switch featuring low insertion loss (0.8 dB @ 2.4 GHz, 0.95 dB @ 5.8 GHz), fast switching time (500 nsec) and high ESD ratings (3.0 kV HBM on all RF pins). The switch supports +1.8V standard logic control. It provides stable RF performance over a power supply range between 2.3V and 5.5V. The packaging is RoHS compliant, 16-lead QFN and measures 3 x 3 mm. Features include;

100 MHz to 6 GHz operation

802.11 a/b/g/n/ac support

Wide power-supply range between 2.3V and 5.5V

+1.8V control logic compatible

Isolation of; 47 dB @ 2.4 GHz, 43 dB @ 6 GHz

High linearity across supply range; IIP3 of 65 dBm, IIP2 of 120 dBm

High power handling; 38.5 dBm @ 2.4 GHz, 37 dBm @ 6 GHz

Fast switching time of 500 nsec

Peregrine Semiconductor; www.psemi.com