A K-band MMIC frequency doubler using resistive series feedback circuit

A novel K-band MMIC frequency doubler has been developed using resistive se ries feedback circuit. The doubler exhibits much better D/U ratio, smaller output power variation against ambient temperature and lower power consumpt ion than those of the conventional single-ended doubler. This pa per presen ts the simulation results on the effect of the resistive series feedback by harmonic balance methods. To obtain practical and accurate simulation resu lts, newly developed gate charge model for C-gs and C-gd is introduced. The fabricated result of the proposed MMIC is also demonstrated.