A COPLANAR WAVE-GUIDE INALAS INGAAS HBT MONOLITHIC KU-BAND VCO/

An 18 GHz coplanar waveguide (CPW) monolithic voltage controlled oscil lator (VCO) has been demonstrated using InAlAs/InGaAs HBT technology, The VCO achieves 6% frequency tuning range using a varactor diode cons tructed from the HBT base emitter junction, A CPW design was employed to increase the Q-factor of the monolithic resonator as well as reduce the chip size, The VCO obtains an output power of +10 +/- 0.5 dBm ove r the tuning range and a collector efficiency of 11.5%. A SSB phase no ise of -72 and -96 dBc/Hz at 100 kHz and 1 MHz offset frequency from t he carrier were achieved, respectively, This represents the first repo rted phase noise results of an InAlAs/InGaAs-based HBT VCO with a mono lithic integrated varactor and are comparable to other MMIC HBT varact or-tuned VCO's reported in this frequency band.