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A Transformer-Coupling Current-Reuse SiGe HBT Power Amplifier for 77-GHz Automotive Radar

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3 Author(s)
Giammello, V. ; Dipt. di Ing. Elettr., Elettron. e dei Sist., Univ. di Catania, Catania, Italy ; Ragonese, E. ; Palmisano, G.

This paper presents a pseudodifferential power amplifier for 77-GHz automotive radar. The circuit is fabricated in a SiGe HBT BiCMOS technology featuring bipolar transistors with fT/fmax of 230/280 GHz. The amplifier adopts a transformer-coupling current-reuse approach to improve both gain and efficiency. An interstacked transformer is also profitably adopted to reduce output losses due to the differential-to-single-ended conversion. The amplifier exhibits a saturated power, a peak power-added efficiency, and a gain of 14.5 dBm, 9%, and 25 dB, respectively, thus achieving a first-rate figure-of-merit as high as 4755.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 6 )