MOSFET RF Switch Flaunts High Isolation

As wireless technology evolves into higher frequencies, many applications are demanding higher isolation performance. To satisfy this need, Peregrine Semiconductor has announced a high-isolation, SPST 50-ohm absorptive switch. Known as the PE4246, this low-insertion-loss switch operates broadband from DC to 5.0 GHz.

The PE4246 Ultra-Thin-Silicon (UTSi) MOSFET RF switch gives isolation characteristics of 55 dB at 1 GHz and 90 dB at 5 GHz. It boasts integrated 50-ohm, 0.25-W terminations on the input and output RF ports. The PE4246 is available in a 6-lead, 3- × -3-mm MLPM package. It operates as a true single-supply device with integrated on-chip CMOS control logic. The single-pin control interface also can be driven by a +5-V TTL signal input. With a nominal 3-V supply, the switches exhibit an ultra-low power consumption of less than 33 µA. Their insertion loss is 0.8 to 1.3 dB over the operating-frequency range.

Samples of the PE4246 are available through Peregrine Semiconductor and Richardson Electronics. In volumes of 10,000, pricing starts at $1.98 per unit.