A SiGe-Based D-Band Fundamental-Wave VCO with 9 dBm Output Power and-185 dBc/Hz FoMT

The design and measurement results of a fully-differential fundamental-wave VCO based on the Colpitts topology are presented. The circuit is realized in a 0.13-mu m SiGe BiCMOS technology with a maximum oscillation frequency of 300GHz. Design measures taken to minimize phase noise and to achieve high output power without using any output buffer are discussed. Operating at a supply voltage of 3.3V, on-wafer measurements show a tuning range of around 12GHz from 147 to 159GHz. The circuit achieves a maximum output power of 9dBm (at 3.3V) and 9.8dBm (at 3.6V), both with an efficiency of around 6% and consumes a DC power of 132mW and 164mW, respectively. The average measured phase noise of the VCO over the entire tuning range is -92dBc/Hz at 1MHz offset, with a minimum phase noise of -96dBc/Hz around 157GHz. The VCO demonstrates state-of-the-art performance in D-Band both in terms of output power and phase noise.