RF switch features constant impedance technology

8th March 2016

Mick Elliott

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Datasheet

The F2923 absorptive radio frequency (RF) switch from Integrated Device Technology (IDT) is now being shipped by distributor Mouser Elkectronics. It is the first single-pole, double-throw (SPDT) RF switch to feature IDT’s K_Z constant impedance technology, which maintains desired impedance of terminals during switching.

The switch features low insertion loss and is designed for RF applications, including base stations, test and measurement, wireless backhaul, public safety infrastructure, and portable handheld devices.

The RF switch covers a broad 300kHz to 8,000MHz frequency range. In addition to low insertion loss (0.48dB at 2 GHz), the switch provides isolation of 74dB at GHz and excellent linearity.

The K_Z technology ensures the switch delivers near-constant impedance when switching from one RF port to another without compromising isolation, linearity, or insertion loss.

For example, standard switches can create a large voltage standing wave ratio (VSWR) of 9-to-1; the F2923 switch maintains a VSWR of less than 1.4‑to‑1, which helps protect against damage to sensitive downstream devices during switching.

The K_Z technology also allows for dynamic or “hot” switching, minimizing local oscillator pulling in time division duplex (TDD) systems, and reducing phase and amplitude variations in distribution networks.

The IDT F2923 RF switch is available in a 4mm × 4mm, 20-pin TQFN package. The switch uses a single positive supply voltage of 3.3VDC and supports standard 1.8V and 3.3V control logic levels.