A 240 GHz multiplier chain with-0.5 dBm output power in SiGe BiCMOS technology

A 240GHz ×4 frequency multiplier chain implemented in a fT/fMAX = 200/250GHz commercially available 0.12μm SiGe BiCMOS technology is presented. The chain achieves a peak output power of-0.5dBm (0.9mW) and consists of two balanced doublers driven by a differential two stages cascode power amplifier. It operates from 232GHz to 246GHz (3 dB power bandwidth) with 5dBm input power at 60GHz and consumes a total DC power of 520mW. The D-Band PA achieves output 1dB compression point and saturated power of 11.2 and 15.3dBm, respectively at 120GHz and 15.5dB small signal gain.