High-Power Submicron InP D-HBT Push-Push Oscillators Operating up to 215 GHz
30 October 2005
High-performance and compact push-push oscillators operating up to 215 GHz were realized in a 0.5 ìm emitter double-heterojunction InGaAs/InP HBT (D-HBT) technology with maximum oscillation frequency fmax of 220 GHz and Vbceo>5V. Two different push- push topologies, each based on a differential Collpitt oscillators topology, were investigated.
Taking the push-push output from the virtual ground at the base-resonator resulted in -8 dBm output power at 184 GHz while about -15...-10 dBm was obtained at 215 GHz by reducing the electrical length of the base resonator. A high-power second harmonic signal of more then 0 dBm was obtained at 184 GHz by directly combining the differential output signal at the collector nodes of the Colpitts oscillator. These oscillators are to our knowledge the highest frequency three-terminal device based sources reported in literature.
