Phase matched AlGaAs/GaAs complementary HBTs for push-pull operation

Nearly ideal push-pull phase performance has been demonstrated using monolithically integrated AlGaAs/GaAs complementary HBTs. The maximum relative phase difference between the devices at a 5 GHz fundamental was 7 and 10 degrees at the 10 GHz second harmonic. When compared to single-ended N pn performance the push-pull pairs exhibited lower second and fourth harmonic content while the fundamental and third harmonic levels were simultaneously reinforced. The phase coherence was stable over a large range of base-collector reverse bias and collector current.