A 4.5 dBm SiGe Doubler-Amplifier Chain Covering the Entire D-Band

We present an ultra-wideband doubler-amplifier chain with an output power 3-dB bandwidth of 110–186 GHz (46.2 %), covering the entire D-band frequencies (110–170 GHz). The chain consists of a push-push frequency doubler with a following buffer amplifier and is fabricated in a 130-nm SiGe BiCMOS technology, occupying a core area of only $0.11 \mathrm{~mm}^{2}$. The circuit demonstrates a peak output power of 4.5 dBm at 140 GHz, while doubler and amplifier consume 86 mW in total.