We report for the first time two-tone test results measured on a GaInP
/GaAs HBT. A 2 x 400 mum2 device delivered more than 1.3 W under one-t
one testing at 7.5 GHz and output more than 1 W under two-tone. The co
rresponding intermodulation product is -14 dBc, and decreases to -21 a
nd -36 dBc, respectively, at 3-dB and 10-dB back-off from the saturate
d two-tone output. These results demonstrate that GaInP/GaAs HBT's are
suitable for microwave transmitter applications.