A 300-GHz High-Power High-Efficiency Voltage-Controlled Oscillator With Low Power Variation

This letter presents a 300-GHz voltage-controlled oscillator (VCO) with high output power and efficiency. The VCO core employs a differential Colpitts topology with inductive degeneration to facilitate a fundamental oscillation at 300 GHz. A common-base output buffer regulates the output power to minimize the power variation during the frequency tuning. The 300-GHz VCO is fabricated in a 130-nm InP double heterojunction bipolar transistor (DHBT)...