IDT Improves RF Switch Performance with New SPDT Switch Featuring KZ Constant Impedance Technology

IDT F2923

IDT’s F2923 Provides Constant Impedance on All Ports During Switching Transitions without Compromising Isolation, Linearity or Insertion Loss

Integrated Device Technology (IDT) introduced the industry’s first single-pole, double-throw (SPDT) RF switch featuring its patent-pending K|Z| constant impedance technology. The IDT F2923 is a low insertion loss SPDT absorptive RF switch designed for a multitude of RF applications, including base stations (2G, 3G, 4G, 5G), wireless backhaul, CATV, and portable handhelds.

IDT - F2923

The K|Z| feature controls all port impedances when switching between RF ports, preserving the return loss. Standard switches without K|Z| create a large voltage standing wave ratio (VSWR) transient when switching RF paths because the impedance of the switch is not well controlled during the switching event. A VSWR transient can degrade system performance and reduce reliability. Benefits of K|Z| in different dynamic or “hot switching” scenarios include:

  • Minimizing switched Tx/Rx Synthesizer pulling and recovery time in TDD systems
  • Avoiding damage and error-inducing transients when switching between two RF elements such as PAs, drivers and LNAs.
  • Minimizing transient amplitude and phase error on the unswitched path(s) when switching a path of a distribution network such as a 3 dB coupler or 4 way splitter.

In addition to K|Z| technology, the device delivers:

  • Insertion loss of only 0.48 dB at 2 GHz
  • IIP3 greater than 66 dBm @ 2 GHz
  • Industry-leading isolation of 74 dB at 2 GHz

Covering a broad frequency range from 300 kHz to 8000 MHz, IDT’s innovative K|Z| technology ensures the device delivers near-constant impedance (VSWR < 1.4:1 compared to 9:1 for standard switches) when switching from one RF port to another while not compromising isolation, linearity, or insertion loss. The F2923 uses a single positive supply voltage of 3.3 V and supports standard 1.8 V and 3.3 V control logic levels.

Evaluation Board for F2923 SPDT
Evaluation Board for F2923 SPDT with Constant Impedance, K|Z|.


The F2923 switch is sampling and comes in a 4 × 4 mm 20-TQFN package.

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