Electronicdesign 2621 Xl sp47rf
Electronicdesign 2621 Xl sp47rf
Electronicdesign 2621 Xl sp47rf
Electronicdesign 2621 Xl sp47rf
Electronicdesign 2621 Xl sp47rf

Tiny SP4T RF Switch Offers Exceptional Linearity

April 22, 2010
SP4T UltraCMOS silicon-on-sapphire RF swtich covers 50 MHz to 3 GHz and targets transmit/receive switching.

PE42440 single-pole four-throw (SP4T) RF switch

Implementing its UltraCMOS silicon-on-sapphire (SOS) process technology, Peregrine Semiconductor recently unveiled the PE42440 single-pole four-throw (SP4T) RF switch. It targets general-purpose Tx/Rx switching in cellular and 2.4-GHz industrial, scientific, and medical (ISM) radio bands; antenna tuning; and filter bank tuning/switching. Applications are wide-ranging, from cellular radios and radio modules, antenna tuning of UHF bands through 3 GHz, and RFID antenna tuning, to 2.4-GHz ISM femtocells and industrial.

The PE42440 (see the figure) covers from 50 MHz up to 3 GHz. RF performance includes an IIP3 of +67 dBm and P1dB of 41.5 dBm (across the range), insertion loss of 0.45 dB, and 34-dB (at 1 GHz) isolation. The 50-Ω switch handles maximum +33 dBm input power (500 MHz to 3 GHz) with world-class electrostatic discharge (ESD) tolerance of 4.0 kV human body model (HBM) on the RFC pin.

Additional features include integrated CMOS control logic, a decoder for two-pin control that accepts 1.8- and 2.75-V control logic levels, and a low 4.5-Ω series on resistance. A single VDD supply pin eliminates the need for multiple power supplies and power-up sequencing—usually mandatory on competitive devices. As with all SOS-based UltraCMOS RFICs, the device settles fast without gate lag or insertion loss drift, plus there’s no need for blocking capacitors.

Peregrine claims that UltraCMOS outperforms GaAs-based (gallium arsenide) and other silicon-on-insulator (SOI) devices. In addition, SOS offers environmental benefits, too, because it doesn’t produce the toxic e-waste associated with GaAs-based devices. The PE42440, housed in the 16-lead 3- by 3-mm quad flat no-lead (QFN) package, costs $0.67 each in 100,000-unit lots.

Peregrine Semiconductor Corp.

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