High Power-Density 4H-SiC RF MOSFETs
We have made a 4H-SiC RF power MOSFETs with cutoff frequency up to 12 GHz, delivering RF power of 1.9 W/mm at 3 GHz. The transistors withstand 200 V drain voltage, are normally-off, and show no gate lag, which is often encountered in SiC MESFETs. The measured devices have a single drain finger and a double gate finger and a total gate width of 0.8 mm. To our knowledge this is the first time that power densities above 1 W/mm at 3 GHz are reported for SiC MOSFETs.
Robert P. Devaty, David J. Larkin and Stephen E. Saddow
G. Gudjónsson et al., "High Power-Density 4H-SiC RF MOSFETs", Materials Science Forum, Vols. 527-529, pp. 1277-1280, 2006