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Subharmonic 220- and 320-GHz SiGe HBT Receiver Front-Ends

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3 Author(s)
Ojefors, E. ; Inst. for High-Freq. & Commun. Technol., Univ. of Wuppertal, Wuppertal, Germany ; Heinemann, B. ; Pfeiffer, U.R.

Monolithically integrated 220- and 320-GHz receiver front-ends manufactured in an engineering version of anfT/fmax=280/435-GHz SiGe technology are presented. Subharmonic mixing is provided by a Gilbert cell with stacked switching quads fed by quadrature 110/160-GHz local oscillator (LO) signals. The 220-GHz version of the front-end is equipped with an integrated LNA with a measured 15-dB gain and 28-GHz bandwidth. This front-end yields a conversion gain of 16 dB, an 18-dB single-sideband (SSB) noise figure (NF), and a 30-GHz bandwidth when pumped with a 0-dBm 110-GHz LO signal. The 320-GHz version of the front-end omits the low-noise amplifier and features an integrated × 9 LO multiplier chain to facilitate operation and characterization. A conversion gain of -14 dB and a 36-dB SSB NF is obtained over the 313-to-328-GHz frequency range. The presented circuits demonstrate that a fully integrated receiver front-end can be implemented up to submillimeter-wave frequencies in an SiGe HBT technology.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 5 )