V-band GaAs pHEMT cross-coupled sub-harmonic oscillator

A V-band cross-coupled sub-harmonic injection-locked oscillator has been designed and fabricated using 0.15-mu m GaAs pHMET technology. Based on the known harmonic injecting circuit topology, this oscillator was designed by a differential output approach, a low-Q microstrip-line resonator, and a current mirror, which has a free-running oscillation frequency around 60 GHz with a tuning range of 2.5 GHz (from 57.8 GHz to 60.3 GHz). The maximum single-end output power is 3.8 d3m with a dc dissipation of 225 mW under a -3 V supply voltage. Within the input matching network for second (30 GHz) and fourth (15 GHz) sub-harmonic signals injection, it demonstrates the maximum locking ranges close to 120 MHz and 30 MHz, respectively.