A 325 GHz Quadrature Voltage Controlled Oscillator With Superharmonic-Coupling

摘要

We present a 325 GHz quadrature voltage controlled oscillator (QVCO) using 0.25 $mu{rm m}$ InP HBT technology and superharmonic coupling of two differential Colpitts VCOs. The individual VCOs exhibit about $-5 mathchar"702D {rm dBm}$ single-ended output power and 10 GHz frequency tuning range. The quadrature oscillation is successfully demonstrated with dc power consumption of 92.4 mW and phase imbalance less than $pm 12^{circ}$ at around 325 GHz.