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MMIC power amps extend X-Band frequency range

Posted: 26 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:MMIC? power amplifier? LNA?

Cree Inc. has launched five new GaN HEMT MMIC amplifiers that increase the range of frequencies available through X-Band. As part of a sample release, the MMICs are currently available as bare die and are targeted to be available in packaged formats later this year.

"The introduction of these MMICs expands our leadership position in providing GaN solutions that improve system performance beyond what can be realized using traditional GaAs MMIC technology for applications such as communication systems, homeland defense, electronic warfare and radar from S-band through X-band," said Jim Milligan, Cree director of RF and microwave products. "By using our proven GaN MMIC process, the performance of these products can provide an attractive combination of power, efficiency and linearity for the system designer."

The CMLA2540001D heralds the introduction of what is claimed to be the first commercially available GaN HEMT LNA MMIC. The device operates over the 2.5GHz to 4GHz band with small-signal gain of 28dB and I/O return losses of greater than 10dB. At an operating voltage of 24V, the device has a noise figure of better than 2dB over the entire frequency range, with a typical value of 1.7dB. I/O third order intercept points are 12dBm and 38dBm, respectively. These features make this MMIC an excellent choice for a robust LNA with improved linearity and input power handling for radar and other S-band applications. This LNA occupies a small chip size of only 1.7mm x 2.5mm.

Designated the CMPA2060025D, this MMIC power amplifier delivers approximately 25W output power from 2GHz to 6GHz, improving on the performance and extending the frequency coverage of Cree's popular CMPA2560025D series devices down to 2.0 GHz. Power gain over the band is 17dB with I/O return losses of better than 7dB. The MMIC shows excellent power added efficiency (PAE) of typically 35% over the entire frequency range and has dimensions of 3.67mm x 3.61mm. This product is ideal for homeland defense and electronic warfare applications.

The CMPA2735075D high power amplifiers provide 75W of output power with a typical PAE of 60% over an instantaneous bandwidth of 2.7GHz to 3.5GHz. Ideal for civil and military radar applications that require significant power, gain and efficiency within a small footprint, the CMPA2735075D is one of the smallest MMIC high-power amplifiers covering this bandwidth available in the marketplace, measuring just 4.42mm x 5mm. The amplifier operates with a supply voltage of 28V with 20dB of power gain (typical); and is matched to 50? I/O, requiring minimal off-chip bias bypassing.

The CMPA5585025D provides more than 25W output power over the 5GHz to 8GHz band and is designed for applications in point-to-point radios, satellite communications, test instrumentation and EMC amplifiers. This MMIC device provides 20dB power gain with typical power added efficiencies of greater than 38% within a footprint of only 17.25mm?.

The CMPA801B025D MMIC power amplifier covers the 8GHz to 11GHz frequency range with a typical output power capability of 25W. This MMIC has applications in satellite communications and a variety of civilian and military radar applications. This device features 18 dB of power gain with typical power added efficiencies of 35% in an extremely small size of 4.78mm x 3.61mm.

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