44GHz silicon switches claim lowest insertion-loss in LGA
Two 44GHz single-pole, double-throw (SPDT) switches, the ADRF5024 and ADRF5025 are offered by Analog Devices in advanced silicon-on-insulator (SoI) technology. The switches are broadband, with the ADRF5024 yielding flat frequency response from 100MHz to 44GHz, and the ADRF5025 yielding from 9.0kHz to 44GHz, with repeatable characteristics better than 1.7dB insertion loss and 35dB channel to channel isolation. Both parts support 27dBm power handling for both through and hot-switching conditions. The switches are in compact, reliable, 2.25 x 2.25mm surface-mount-technology compatible package, exhibiting electrical performance beyond incumbent solutions, saving bias power, eliminating peripheral components and achieving higher integration in systems such as phased arrays, portable instrumentation, high resolution body scanners and next generation millimeter-wave communication infrastructure for 5G and high-constellation satellite networks.
The ADRF5024 and ADRF5025 employ inherent reflective architecture and are characterised for an operating temperature range of –40 to +105 degree C. All pins incorporate electrostatic discharge (ESD) protection. The devices are nominally powered by ±3.3V, drawing low supply current of less than 120 microA typical. The devices use standard positive logic control voltages, simplifying the interface design, advises Analog Devices.
The ADRF5024 and ADRF5025 are replacements for PIN diode-based counterparts, as no external components are necessary for bias generation or matching, and signal pins are internally biased at ground reference to eliminate the need for DC blocking capacitors.
The ADRF5024 is optimised for fast switching applications with speeds less than 10 nano seconds and edge rates at two nano seconds. The ADRF5025 is optimised for wideband applications with good low frequency characteristics down to 9.0kHz. The other characteristics are the same so the parts are drop-in replacements and can be used interchangeably on the same PCB footprint.
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