RF switch performance improved with SPDT switch

25th November 2015
Source: IDT
Posted By : Jordan Mulcare
RF switch performance improved with SPDT switch

IDT has introduced the industry’s first single-pole, double-throw (SPDT) RF switch featuring its patent-pending KZ 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.

The KZ feature controls all port impedances when switching between RF ports, preserving the return loss. Standard switches without KZ 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 Kz in different dynamic or 'hot switching' scenarios include:

  • Minimising 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.
  • Minimising transient amplitude and phase error on the unswitched path(s) when switching a path of a distribution network such as a 3dB coupler or 4 way splitter

“With this latest SPDT switch, we highlight our new KZ technology to dramatically improve hot-switching performance,” said Chris Stephens, General Manager of RF division, IDT. “The F2923 demonstrates yet again IDT’s leadership in the core RF innovations that system developers desire.”

In addition to KZ technology, the device delivers Insertion loss of only 0.48dB at 2GHz, IIP3 greater than 66dBm at 2GHz and industry-leading isolation of 74 dB at 2 GHz.

Covering a broad frequency range from 300kHz to 8000MHz, IDT’s innovative Kz 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 3.3V and supports standard 1.8 and 3.3V control logic levels.


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