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GaN HEMTs boost WiMAX power amplification

Posted: 27 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:WiMAX? HEMT? transistors? Cree? xx?

GaN transistors from Cree

Cree Inc. is shipping sample quantities of three gallium nitride (GaN) high electron mobility transistors (HEMTs) that are capable of boosting WiMAX power amplification efficiency by up to 50 percent.

The CGH27015S, CGH35015S and CGH35030F provide linear power and efficiency for WiMAX and broadband wireless access applications operating between 2.3GHz and 3.9GHz.

The CGH27015S, contained in a small 3-by-3mm plastic over-mold QFN package, typically produces 2.5W of average output power and 28-percent drain efficiency over the frequency range of 2.3GHz to 2.9GHz.

40% improvement
According to Cree, this represents up to a 40-percent improvement in device efficiency when compared with traditional technologies such as silicon LDMOS or GaAs under WiMAX signals and requirements (802.16-2004). It also features 15dB of small-signal gain and 2-percent error vector magnitude (EVM) under OFDM modulation when operated at 28V.

The CGH35015S, also provided in an over-mold QFN package, typically produces more than 2.5W of average power and 28-percent drain efficiency with typical small-signal gain of 13dB over the frequency range of 3.3GHz to 3.9GHz. According to Cree, this represents up to a 50-percent improvement in device efficiency when compared with silicon LDMOS or GaAs under WiMAX signals.

23% efficiency
In addition, the CGH35030F transistor provides 4W of average power with 23-percent efficiency over the 3.3GHz to 3.9GHz frequency range. This component features more than 11dB gain and 2-percent EVM under OFDM modulation. When employed in an efficiency-enhancement circuit, a pair of these transistors produced more than 10W of average power with over 42-percent efficiency in the 3.5GHz WiMAX band, according to the company.

All three of the Cree devices are EU RoHS-compliant.

- Ismini Scouras
eeProductCenter




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