W-Band SiGe Frequency Doubler with Optimum Harmonic Termination for 14% Efficiency

A W-band balanced frequency doubler with an optimized harmonic termination and neutralization technique is proposed for high output power and high conversion efficiency in a 90-nm SiGe process. The proposed design demonstrates a peak conversion gain of 0.7 dB and the maximum output power higher than 4 dBm at an output frequency of 84 GHz with the conversion efficiency of 14%.