A Full V-Band High-Output Power Frequency Doubler with High Fourth Harmonic Suppression in a InGaAs mHEMT Technology

This paper presents a full V-Band frequency doubler with high output power and high harmonic suppression, including the fourth harmonic, without any dedicated active or passive filter structure following the doubler stage. The circuit is based on a balanced architecture, and designed in a 35 nm mHEMT technology. The differential signal is generated at the input using an on-chip broadside transformer balun. The MMIC achieves a maximum output power of 5.7 dBm at a frequency of 62 GHz, with a suppression of unwanted harmonics of 27.5 dBc. Over the whole V-Band, a minimum suppression of unwanted harmonics of 21 dBc is achieved.