A 278-348 GHz 6th Harmonic Injection Locking Frequency Multiplier based on 3rd Harmonic Injection Locking Oscillator in 130 nm SiGe Process

This paper presents a 3rd ILO and a 6th ILFM fabricated in 130-nm SiGe BiCMOS technology. A hybrid-Colpitts model has been proposed to improve the conventional model of the Colpitts oscillator above 100 GHz. The 3rd ILO can be locked from 285 GHz to 345 GHz and the 6th ILFM can be locked from 278 GHz to 348 GHz. The maximum output power of the 3rd ILO is 1.1 dBm at 285 GHz with a peak DC-RF efficiency of 1.92% and the maximum output power of the 6th ILFM is 1.33 dBm at 288 GHz with a peak DC-RF efficiency of 1.5%. The 3-dB BW of the 6th ILFM is from 278 to 333 GHz. To the best knowledge of the authors, the measured locking range of 70GHz (22.3%) and the 3-dB BW of 55 GHz (18%) are the widest for the reported injection locking signal sources above 100 GHz.