
151Group III-Nitride Microwave Monolithically Integrated Circuits
5.2.1 gALLiuM nitride cLAss-A, cLAss-B, And cLAss-c
M
icrowAve MonoLithicALLy integrAted circuits
Class-A operation is very desirable for any amplier to enhance linearity and to
maximize output power levels [27]. The class-A operation for GaN is very critical
due to the high power density for this mode of operation. This can be estimated
from the graph in Figure 5.6. It provides the dissipated power for linear operation
as a function of the operation bias for class-A and maximum current typical for
GaN. Most of the GaN MMIC are thus operated in class-A/B [28] with a relativel ...