High power CG2409 RF switches from CEL increase data throughput

Affordable pHEMT (pseudomorphic high electron mobility transistor) RF switches from CEL are claimed to provide increased data throughput, improved coverage range, and better signal quality.

The CEL CG2409 family of high power RF switches is available in two packages, the X3 and M2. The CG2409X3 and CG2409M2 are manufactured using pHEMT technology and are packaged and tested in Japan. 

RF switches are microwave devices that route high frequency signals through transmission paths and can be used for diverse range of RF product applications including WLAN, mobile communications, wireless security, wireless home automation and digital. The CG2409X3 and CG2409M2 RF switch components can be used within an application to switch between transmit/receive modes, as diversity switches, switching between two different antennae, and also switching between RF frequency bands.

The CG2409X3 is a wideband, high-power single-pole, double-throw (SPDT) GaAs MMIC RF switch. It is specified for the frequency range of 0.05 to 6GHz, and can operate at a control voltage from 1.8 to 5.0V. The P0.1dB compression point of the switch is 37.5dBm at 3.0V.  The second and third harmonic specs are -80dBc and -85dBc respectively at input power of 26dBm. The insertion loss ranges from 0.3dB to 0.6dB while the isolation ranges from 32 to 28dB over the frequency range. The device is in a compact, six-pin XSON package (1.5 x 1.5 x 0.37mm). 

The CG2409M2 is also a high-power, single-pole, double-throw (SPDT) GaAs MMIC RF switch but is specified for the frequency range of 0.05 to 3.8GHz and operates at a control voltage from 1.8 to 5.0V. The P0.1dB compression point of the switch is 36.5dBm. The second and third harmonic specs are -80 and -85dBc respectively at input power of 26dBm. The insertion loss ranges from 0.35 to 0.6dB, while the isolation ranges from 35 to 21dB over the frequency range. This device is in a small, six-pin surface mount package (2.0 x 1.25 x 0.9mm).

CEL points out that there are two trends that dominate recent Wi-Fi systems development. One is the increase of RF transmission power for improved coverage range and better signal quality, and the other is the increasing use complex modulation schemes to boost the data throughput.

Both trends put more stringent requirements on power handling capability as well as linearity of the RF components used in the transmission path in order to meet regulatory and signal integrity specifications.  As a result, RF switches at the antenna ports are now one of the most critical components. While more integrated front-end-modules are finding increasing usage, particularly for space constrained applications, CEL maintains that discrete MMIC switches still offer the most flexibility in terms of system configuration and performance selection. 

These new CEL switches are drop-in compatible to at least one RF switch model from Renesas (Renesas switches are also offered through CEL), at a lower price than their equivalent drop-in Renesas RF switches. 

http://www.cel.com

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